feat(docs): add agent guide, build class patterns, log triage, and AI instructions (#1202)

.github/copilot-instructions.md

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+# StaticPHP v3 Copilot Instructions
+
+> The canonical agent instructions live in [AGENTS.md](./AGENTS.md). This file provides the essential summary for GitHub Copilot; read `AGENTS.md` for the complete project map, working rules, and validation steps.
+
+StaticPHP is a PHP CLI application for building static PHP binaries, PHP SAPIs, extensions, libraries, and helper tools. Prefer the v3 architecture under `src/StaticPHP`, `src/Package`, `config/pkg`, and `config/artifact`.
+
+## Skills
+
+Use the repository skills when the task matches them:
+
+- `.github/skills/staticphp-package-maintenance`: add, modify, review, or validate package, artifact, extension, library, target, or tool definitions.
+- `.github/skills/staticphp-build-troubleshooting`: diagnose build, download, doctor, shell, terminal, CI, smoke-test, or log failures.
+
+## Quick Reference
+
+- **Entrypoint**: `php bin/spc`
+- **Config lint**: `php bin/spc dev:lint-config`
+- **CS fix**: `composer cs-fix`
+- **Tests**: `composer test`
+- **Static analysis**: `composer analyse`
+- **Extension packages**: `config/pkg/ext/ext-*.yml`, prefix with `ext-` in dependencies
+- **Platform suffixes**: `@unix`, `@linux`, `@macos`, `@windows` — prefer these over runtime conditionals
+- **Do NOT edit generated dirs**: `buildroot/`, `source/`, `downloads/`, `pkgroot/`

.github/skills/staticphp-build-troubleshooting/SKILL.md

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+---
+name: staticphp-build-troubleshooting
+description: Diagnose StaticPHP v3 failures. Use when investigating build, compile, linker, download, doctor, environment, CI, smoke-test, terminal output, spc.output.log, spc.shell.log, config.log, CMake logs, or user-provided error snippets from StaticPHP commands.
+---
+
+# StaticPHP Build Troubleshooting
+
+## Overview
+
+Use this skill to triage StaticPHP failures from the outside in: command and environment first, SPC module/stage metadata next, shell/config logs last. The goal is to isolate the failing package, stage, command, and root cause before editing code.
+
+## First Pass
+
+1. Capture the exact command, OS, architecture, PHP version, extensions/libs/targets, and whether the run used `-v`, `-vv`, or `-vvv`.
+2. Read the final terminal error first. StaticPHP prints module error info, failed package, failed stage, failed command, log paths, and extra log files when available.
+3. If log files exist, inspect them in this order:
+   - `log/spc.output.log`: user-facing SPC messages and exception summary.
+   - `log/spc.shell.log`: executed commands, working directories, env, stdout/stderr.
+   - Extra logs named in the exception output: `php-src.config.log`, `lib.<pkg>.console.log`, `lib.<pkg>.cmake-error.log`, `lib.<pkg>.cmake-configure.log`, `lib.<pkg>.cmake-output.log`.
+4. Read `references/log-triage.md` for pattern matching, likely causes, and next checks.
+
+## Diagnosis Rules
+
+- Do not start by changing shared core code. Most failures are package metadata, environment, upstream source, dependency order, or platform flags.
+- Prefer evidence from the last failing command over earlier warnings.
+- When logs are long, search backward for `Command exited`, `error:`, `undefined reference`, `not found`, `No package`, `CMake Error`, `configure: error`, `fatal error`, `Failed module`, and `Failed stage`.
+- Use `config.log` and CMake logs for configure detection failures; use `spc.shell.log` for the actual command and env.
+- Be careful with rebuild suggestions. `spc reset --with-download --yes` is destructive to caches; ask before clearing caches unless the user explicitly asked.
+
+## Repro Commands
+
+Use focused commands when reproducing:
+
+```bash
+php bin/spc doctor -vvv
+php bin/spc download --for-extensions="curl,openssl" --with-php=8.5 --parallel=4 --retry=3 -vvv
+php bin/spc build:libs "openssl" -vvv
+php bin/spc build:php "bcmath,openssl,curl" --build-cli -vvv
+php bin/spc dev:lint-config
+```
+
+Choose the smallest command that still reaches the failing package.
+
+## Fix Direction
+
+After finding the failing package/stage:
+
+- Package YAML issue: use `$staticphp-package-maintenance`, then edit `config/pkg/*` or `config/artifact/*`.
+- Build command or patch issue: inspect the package class under `src/Package/*`.
+- Environment issue: check `doctor`, toolchain classes, and `config/pkg/tool/*`.
+- Upstream download issue: check artifact type, regex, GitHub rate limiting, mirror behavior, and `GITHUB_TOKEN`.
+- Core exception/logging issue: inspect `src/StaticPHP/Exception`, `src/StaticPHP/Runtime/Shell`, or executor classes only after package-level causes are ruled out.
+
+## Resources
+
+- `references/log-triage.md`: log files, failure categories, search patterns, and likely fixes.

.github/skills/staticphp-build-troubleshooting/agents/openai.yaml

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+interface:
+  display_name: "StaticPHP Build Troubleshooting"
+  short_description: "Diagnose StaticPHP build and log failures."
+  default_prompt: "Use $staticphp-build-troubleshooting to investigate a StaticPHP build, download, doctor, or log failure."

.github/skills/staticphp-build-troubleshooting/references/log-triage.md

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+# StaticPHP Log Triage
+
+## Contents
+
+- Log files
+- Terminal summary
+- Search strategy
+- Failure categories
+- Rebuild hygiene
+- Reporting checklist
+
+## Log Files
+
+Default log directory is `log/`, controlled by `SPC_LOGS_DIR`. The important files are:
+
+- `spc.output.log`: StaticPHP console/logger output and exception summaries.
+- `spc.shell.log`: command execution log with command, caller, inline env, working directory, stdout, stderr, and exit code.
+- `php-src.config.log`: copied when PHP source configure fails.
+- `lib.<pkg>.console.log`: copied Autoconf `config.log` for a library when available.
+- `lib.<pkg>.cmake-configure.log`: copied CMake 3.26+ configure log.
+- `lib.<pkg>.cmake-error.log`: copied CMake error log.
+- `lib.<pkg>.cmake-output.log`: copied CMake output log.
+
+Logs are created when `SPC_ENABLE_LOG_FILE` is true. Old `*.log` files are cleaned unless `SPC_PRESERVE_LOG` is set to a truthy value. The code in `src/bootstrap.php` reads `SPC_PRESERVE_LOG` (no trailing S).
+
+## Terminal Summary
+
+StaticPHP exceptions often print:
+
+- Exception category: build, download, environment, execution, file system, patch, validation, wrong usage, registry, internal.
+- Failed module: package name, type, and sometimes class/file/line.
+- Failed stage: call chain such as `build` or `build -> configure`.
+- Failed command: the command that returned non-zero.
+- Command working directory and inline env.
+- Paths to `spc.output.log`, `spc.shell.log`, and extra logs.
+
+Use this summary to choose the first files to read. If a package and stage are present, start with that package's YAML and class after reading the relevant log tail.
+
+## Search Strategy
+
+For long logs, search from the end first.
+
+Useful patterns:
+
+```text
+Failed module:
+Failed stage:
+Failed command:
+Command exited with non-zero code
+configure: error
+CMake Error
+undefined reference
+cannot find -l
+fatal error:
+No package
+Package .* not found
+Could NOT find
+is not a valid
+permission denied
+curl: (
+HTTP/2 403
+rate limit
+```
+
+In `spc.shell.log`, each command block begins with `>>>>>>>>>>>>>>>>>>>>>>>>>>`, then prints the command, caller, env, and working dir. The last failed block is usually the highest-value evidence.
+
+## Failure Categories
+
+### Download Failure
+
+Signs:
+
+- `Download failed`
+- `curl: (56)`, `curl: (22)`, HTTP 403/404/429
+- GitHub API calls in verbose logs
+- Asset regex did not match a release asset
+
+Likely checks:
+
+- If GitHub rate limited, ask user to set `GITHUB_TOKEN`.
+- Verify artifact source type and regex in `config/pkg/*` or `config/artifact/*`.
+- Use `--dl-retry`, `--dl-parallel`, `--ignore-cache`, `--no-alt`, or custom source options only as repro aids.
+- Prefer fixing stale URLs/regexes over adding workarounds.
+
+### Doctor or Environment Failure
+
+Signs:
+
+- `Environment check failed`
+- missing `make`, `cmake`, `autoconf`, `pkg-config`, compiler, Perl, Visual Studio, MSYS2, Zig, etc.
+- `Some check items can not be fixed`
+
+Likely checks:
+
+- Run `php bin/spc doctor -vvv`.
+- Inspect `src/StaticPHP/Doctor/Item/*` for the check and fix behavior.
+- Inspect `config/pkg/tool/*` for installable helper tools.
+- On Windows, some dependencies cannot be auto-installed.
+
+### Configure Failure
+
+Signs:
+
+- `configure: error`
+- Autoconf failure before compilation
+- extra `config.log` listed
+
+Likely checks:
+
+- Read copied `php-src.config.log` or `lib.<pkg>.console.log`.
+- Look for the first compiler/linker probe that failed.
+- Check `headers`, `static-libs`, `pkg-configs`, dependency order, and `initializeEnv($pkg)` behavior.
+- For extensions, check `php-extension.arg-type` and `#[CustomPhpConfigureArg]`.
+
+### CMake Failure
+
+Signs:
+
+- `CMake Error`
+- `Could NOT find`
+- missing target, package config, or static library
+
+Likely checks:
+
+- Read `lib.<pkg>.cmake-error.log` and `lib.<pkg>.cmake-configure.log`.
+- Inspect `UnixCMakeExecutor`/`WindowsCMakeExecutor` usage in the package class.
+- Check CMake options, toolchain root path, `pkg-configs`, and transitive dependency libraries.
+
+### Compile Failure
+
+Signs:
+
+- compiler `fatal error: header.h: No such file or directory`
+- syntax/type errors from upstream source
+- incompatible PHP API or platform macros
+
+Likely checks:
+
+- Identify the source file and include path from `spc.shell.log`.
+- Verify dependency headers are installed in `buildroot/include`.
+- Check PHP version compatibility and existing patches in `src/globals/patch`.
+- Prefer targeted patches or compile flags in the package class over broad toolchain changes.
+
+### Link Failure
+
+Signs:
+
+- `undefined reference`
+- `cannot find -lfoo`
+- duplicate symbols
+- Windows unresolved external symbol or missing `.lib`
+
+Likely checks:
+
+- Verify `static-libs`, dependency order, and `getStaticLibFiles()` usage.
+- Inspect `SPC_EXTRA_LIBS`, `Libs.private` in `.pc` files, and package-specific pkg-config patching.
+- On Windows, confirm `.lib` names and required system libraries.
+- For OpenSSL/curl-like packages, search existing linker flag hooks before adding a new one.
+
+### Smoke Test or Validation Failure
+
+Signs:
+
+- `Validation failed`
+- `php --ri` failure
+- extension not loaded after build
+- micro/embed runtime smoke test fails
+
+Likely checks:
+
+- Check extension `display-name`; empty string skips `php --ri`.
+- Confirm static vs shared build settings.
+- Confirm the extension is included in the final SAPI target and not only built as a dependency.
+- Inspect `src/globals/ext-tests/*` and common tests for expected runtime behavior.
+
+### Registry or Config Failure
+
+Signs:
+
+- `Registry error`
+- unknown package, invalid field, invalid platform suffix, type mismatch
+- package referenced by attribute but missing config
+
+Likely checks:
+
+- Run `php bin/spc dev:lint-config`.
+- Inspect `ConfigValidator` tests for accepted fields and error expectations.
+- Confirm attribute type matches YAML `type`.
+- Confirm hooks reference existing package names and stages for the current platform.
+
+## Rebuild Hygiene
+
+Use the smallest cleanup that can invalidate the suspected stale state:
+
+- Redownload one artifact: `--ignore-cache="artifact-name"`.
+- Skip downloads to test local source/build logic: `--no-download`.
+- Prefer source when debugging build logic: `--dl-prefer-source`.
+- Clear build products only when necessary. `spc reset --with-download --yes` removes caches and should not be suggested casually.
+
+## Reporting Checklist
+
+When preparing an issue or PR explanation, include:
+
+- Exact `php bin/spc ...` command.
+- OS, architecture, PHP version option, and relevant env vars.
+- Failed package and stage.
+- Last failed command and exit code.
+- Tail of `spc.output.log`, relevant command block from `spc.shell.log`, and any extra config/CMake log.
+- Whether the failure reproduces after a focused clean or cache refresh.

.github/skills/staticphp-package-maintenance/SKILL.md

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+---
+name: staticphp-package-maintenance
+description: Maintain StaticPHP v3 packages and artifacts. Use when adding, modifying, reviewing, or validating config under config/pkg or config/artifact; package classes under src/Package; extension/library/target/tool dependencies; PHP configure args; build hooks; package metadata; or related tests and docs.
+---
+
+# StaticPHP Package Maintenance
+
+## Overview
+
+Use this skill to make focused package changes without re-reading the entire repository. StaticPHP v3 separates declarative package/artifact YAML from package-specific PHP build logic; prefer config-only edits unless current patterns require a class.
+
+## Quick Workflow
+
+1. Identify the package kind and exact name.
+   - Extension: `config/pkg/ext/ext-name.yml`, class `src/Package/Extension/name.php`.
+   - Library: `config/pkg/lib/name.yml`, class `src/Package/Library/name.php`.
+   - Target or virtual target: `config/pkg/target/name.yml`, class `src/Package/Target/name.php`.
+   - Tool: `config/pkg/tool/name.yml`, class `src/Package/Tool/name.php`.
+   - Shared/custom artifact: `config/artifact/name.yml`, class `src/Package/Artifact/name.php`.
+
+2. Search for the closest existing package before designing anything new.
+   - Similar build system: `rg "#\\[BuildFor|UnixCMakeExecutor|UnixAutoconfExecutor|WindowsCMakeExecutor" src/Package`.
+   - Similar config fields: `rg "static-libs|pkg-configs|arg-type|depends@" config/pkg`.
+   - Similar download type: `rg "type: ghrel|type: pecl|type: pie|type: git|binary: hosted" config`.
+
+3. Read `references/package-reference.md` when changing YAML fields, artifact definitions, package naming, dependencies, platform suffixes, or validation expectations.
+
+4. Read `references/build-class-patterns.md` when PHP build logic, attributes, lifecycle hooks, custom configure args, source patching, or executor usage is needed.
+
+5. Validate narrowly, then broadly if risk warrants it.
+   - Config lint: `php bin/spc dev:lint-config`
+   - Focused tests: `vendor/bin/phpunit tests/StaticPHP/Config tests/StaticPHP/Registry tests/StaticPHP/Util/DependencyResolverTest.php --no-coverage`
+   - Full project checks: `composer test`, `composer analyse`
+
+## Editing Rules
+
+- Treat `config/pkg/*` and `config/artifact/*` as the source of package truth; package classes augment behavior.
+- Use platform suffix fields for declarative OS differences: `@unix`, `@linux`, `@macos`, `@windows`.
+- Add a PHP class only for custom build stages, validation, hook behavior, patches, or custom configure arguments.
+- Keep extension dependencies prefixed with `ext-`; libraries, tools, and targets use their package names.
+- Prefer existing helpers such as `UnixAutoconfExecutor`, `UnixCMakeExecutor`, `WindowsCMakeExecutor`, `shell()`, `cmd()`, and `FileSystem`.
+- Do not modify build outputs (`buildroot/`, `source/`, `downloads/`, `pkgroot/`) to fix package definitions.
+- If upstream metadata changes, update license metadata and smoke-test/display names when relevant.
+
+## Common Task Paths
+
+- Add a new PECL extension: define `config/pkg/ext/ext-name.yml` with `type: php-extension`, `artifact.source.type: pecl`, dependencies, and `php-extension.arg-type`; add a class only if configure args, patches, or hooks are non-standard.
+- Add a library: define `config/pkg/lib/name.yml` with artifact, dependencies, and install verification fields (`headers`, `static-libs`, `pkg-configs`, `static-bins`); add build class methods by OS.
+- Fix an existing package build: start from the failing package config/class, then inspect dependencies and hooks targeting that package before changing shared core code.
+- Update a version source: prefer artifact fields that support update checking (`ghrel`, `ghtar`, `ghtagtar`, `git` with regex, `filelist`, `pecl`, `pie`) over hard-coded URLs when upstream supports it.
+
+## Resources
+
+- `references/package-reference.md`: YAML package/artifact model, naming, fields, validation, and commands.
+- `references/build-class-patterns.md`: PHP package attributes, stages, hooks, executors, and class patterns.

.github/skills/staticphp-package-maintenance/agents/openai.yaml

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+interface:
+  display_name: "StaticPHP Package Maintenance"
+  short_description: "Add, update, and validate StaticPHP v3 package definitions."
+  default_prompt: "Use $staticphp-package-maintenance to add, modify, or review StaticPHP package and artifact definitions."

.github/skills/staticphp-package-maintenance/references/build-class-patterns.md

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+# StaticPHP Build Class Patterns
+
+## Contents
+
+- When a class is needed
+- Package attributes
+- Stage and hook behavior
+- Executor choices
+- Common patterns
+- Failure-safe edits
+
+## When a Class Is Needed
+
+Do not add a PHP package class for simple metadata. Use YAML alone when StaticPHP can infer the configure args, dependencies, and verification.
+
+Add or update a class when the package needs:
+
+- OS-specific build commands.
+- Custom validation before building.
+- Custom PHP configure arguments.
+- Patches or file edits before build.
+- Hooks into another package's stage.
+- Custom source/binary download or extraction logic.
+- Package info shown by dev tooling.
+
+Package classes live in `src/Package/*` and are discovered through PSR-4 plus attributes. Config must exist first; `PackageLoader` throws if an attribute references an undefined package.
+
+## Package Attributes
+
+Class-level package attributes:
+
+- `#[Extension('curl')]` maps to package `ext-curl` if the prefix is omitted.
+- `#[Library('openssl')]`
+- `#[Target('php')]`
+- `#[Tool('zig')]`
+
+Method-level attributes:
+
+- `#[BuildFor('Linux'|'Darwin'|'Windows')]`: registers the `build` stage for that OS.
+- `#[Stage('name')]`: registers a named stage; defaults to the method name when omitted.
+- `#[BeforeStage('package', 'stage', 'only-when-package-resolved')]`: hook before a target package stage.
+- `#[AfterStage('package', 'stage', 'only-when-package-resolved')]`: hook after a target package stage.
+- `#[PatchBeforeBuild]`: runs once before package build unless `.spc-patched` exists; return `true` to write that marker.
+- `#[CustomPhpConfigureArg('Linux')]`: supplies custom extension configure args.
+- `#[Validate]`: validates environment/source assumptions.
+- `#[Info]`: returns package information for tooling.
+- `#[InitPackage]`: runs while loading a package class.
+- `#[ResolveBuild]`: target package callback for resolving build dependencies.
+- `#[ConditionalOn(SomeClass::class)]`: conditionally enables before/after hooks only when DI has the class.
+
+## Stage and Hook Behavior
+
+`PackageBuilder::buildPackage()` does:
+
+1. Ensure build directories exist.
+2. Skip if already installed unless forced.
+3. Ensure source exists for non-virtual packages.
+4. Emit `PatchBeforeBuild` callbacks.
+5. Run the `build` stage.
+6. Install license data.
+7. Record tool package versions where relevant.
+
+`Package::runStage()` wraps a stage with:
+
+1. `BeforeStage` callbacks.
+2. The stage method itself.
+3. `AfterStage` callbacks.
+
+SPC exceptions bind package and stage metadata. Preserve that behavior by throwing existing `SPCException` subclasses instead of raw exceptions when adding new failure paths.
+
+## Executor Choices
+
+Use existing executors where possible:
+
+- `UnixAutoconfExecutor`: for Unix packages using `./configure && make && make install`. It injects default static flags and copies `config.log` into SPC logs on failure.
+- `UnixCMakeExecutor`: for Unix CMake packages. It writes toolchain settings and copies CMake configure/error/output logs on failure.
+- `WindowsCMakeExecutor`: for Windows CMake packages.
+- `shell()->cd(...)->initializeEnv($pkg)`: for custom Unix command chains.
+- `cmd()->cd(...)`: for Windows command chains.
+
+Prefer `FileSystem` helpers for file edits and copies so behavior stays consistent.
+
+## Common Patterns
+
+Minimal library class:
+
+```php
+#[Library('example')]
+class example
+{
+    #[BuildFor('Linux')]
+    public function build(LibraryPackage $pkg): void
+    {
+        (new UnixAutoconfExecutor($pkg))
+            ->configure()
+            ->make();
+    }
+}
+```
+
+Extension hook into PHP build:
+
+```php
+#[Extension('curl')]
+class curl
+{
+    #[BeforeStage('php', [php::class, 'makeForWindows'], 'ext-curl')]
+    public function patchBeforePhpBuild(): void
+    {
+        // Adjust env, generated build files, or linker flags.
+    }
+}
+```
+
+Validation:
+
+```php
+#[Validate]
+public function validate(): void
+{
+    if (SystemTarget::getTargetOS() === 'Windows' && WindowsUtil::findCommand('perl.exe') === null) {
+        throw new EnvironmentException('You need to install perl first!');
+    }
+}
+```
+
+Custom configure args should be used when YAML `arg-type` is `custom` or when args need package/install context:
+
+```php
+#[CustomPhpConfigureArg('Linux')]
+public function configureArg(PhpExtensionPackage $ext): string
+{
+    return '--with-example=' . $ext->getBuildRootPath();
+}
+```
+
+## Failure-Safe Edits
+
+- Make hooks conditional with the third `BeforeStage`/`AfterStage` argument when a dependency must be resolved before the hook should run.
+- Keep platform-specific code under matching `#[BuildFor]` methods rather than branching heavily inside one method.
+- If a patch changes upstream source, place patch files in `src/globals/patch/` and describe them with `#[PatchDescription]` where appropriate.
+- If a class only mutates environment variables for another package, search for existing hooks first to avoid duplicate linker flags.
+- After adding attributes, run registry/config tests because invalid stages and unknown packages are caught during loading.

.github/skills/staticphp-package-maintenance/references/package-reference.md

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+# StaticPHP Package Reference
+
+## Contents
+
+- Package locations
+- Package types
+- Artifact model
+- Common YAML fields
+- PHP extension fields
+- Platform suffixes
+- Validation and tests
+
+## Package Locations
+
+StaticPHP v3 keeps package metadata in YAML and behavior in PHP classes.
+
+| Kind | YAML | PHP class namespace | Typical attribute |
+|---|---|---|---|
+| PHP extension | `config/pkg/ext/ext-name.yml` | `Package\Extension` | `#[Extension('name')]` |
+| Library | `config/pkg/lib/name.yml` | `Package\Library` | `#[Library('name')]` |
+| Target | `config/pkg/target/name.yml` | `Package\Target` | `#[Target('name')]` |
+| Virtual target | `config/pkg/target/name.yml` | `Package\Target` | `#[Target('name')]` |
+| Tool | `config/pkg/tool/name.yml` | `Package\Tool` | `#[Tool('name')]` |
+| Custom artifact | `config/artifact/name.yml` | `Package\Artifact` | artifact attributes |
+
+Prefer one package per YAML file unless an existing file groups related definitions. Match nearby naming and ordering.
+
+## Package Types
+
+`php-extension` packages describe PHP extensions. Config package names must use the `ext-` prefix. Dependencies on extensions also use `ext-`.
+
+`library` packages describe buildable dependency libraries. They usually define source artifacts plus verification fields such as headers, static libraries, pkg-config files, or binaries.
+
+`target` packages represent final build outputs and inherit the library-style fields. StaticPHP automatically exposes build commands for targets.
+
+`virtual-target` packages are abstract dependency/build scheduling nodes. They may omit `artifact`.
+
+`tool` packages are helper programs or toolchains installed into `pkgroot/` or used by builds.
+
+## Artifact Model
+
+Artifacts define downloadable source archives or prebuilt binaries. Use inline artifacts for simple one-package sources and `config/artifact/*.yml` for shared, complex, or custom artifacts.
+
+Top-level artifact sections:
+
+- `source`: source archive, git checkout, PECL/PIE package, local directory, or custom source.
+- `binary`: prebuilt binary by platform, or aliases such as `hosted`/`custom`.
+- `metadata`: `license`, `license-files`, and `source-root`.
+
+Common source types:
+
+- `url`: fixed URL; supports `filename`, `version`, and `extract`.
+- `git`: repository source; use `rev` for a fixed branch/tag/commit or `regex` with named `version` capture for update checks.
+- `ghrel`: GitHub release asset by regex filename match.
+- `ghtar`: generated GitHub release tarball.
+- `ghtagtar`: generated GitHub tag tarball.
+- `filelist`: scrape a download index and extract version/filename with regex.
+- `pecl`: PECL extension by name.
+- `pie`: Packagist PIE extension by `vendor/package`.
+- `php-release`: official PHP source selected by build PHP version.
+- `local`: local source directory for development/offline use.
+- `custom`: PHP artifact class handles source or binary logic.
+
+Use `metadata.source-root` when the actual build directory is inside an extracted subdirectory.
+
+Use `metadata.license-files` for source licenses. `@/file.txt` points to bundled license files in `src/globals/licenses/`.
+
+## Common YAML Fields
+
+Shared fields:
+
+- `type`: required package type.
+- `description`: optional human-readable package description.
+- `license`: package-level license annotation where applicable.
+- `lang`: implementation language such as `c` or `c++`.
+- `frameworks`: macOS framework tags.
+- `artifact`: string reference or inline artifact object. Required for `library` and `target`; optional for built-in extensions and virtual targets.
+- `depends`: hard dependencies.
+- `suggests`: optional dependencies.
+
+Library, target, and tool verification/installation fields:
+
+- `headers`: expected files/directories under `buildroot/include`.
+- `static-libs`: expected static libraries under `buildroot/lib`.
+- `pkg-configs`: expected `.pc` files under `buildroot/lib/pkgconfig`.
+- `static-bins`: expected executables under `buildroot/bin`.
+- `path`: directories appended to PATH after install.
+- `env`: environment variables set after install.
+- `append-env`: values appended to existing environment variables.
+
+Path placeholders in `path`, `env`, and `append-env`:
+
+- `{build_root_path}`: `buildroot/`
+- `{pkg_root_path}`: `pkgroot/`
+- `{working_dir}`: repository or working directory
+- `{download_path}`: `downloads/`
+- `{source_path}`: `source/`
+- `{spc_msys2_path}`: MSYS2 root on Windows
+
+## PHP Extension Fields
+
+Extension-specific fields live under `php-extension`.
+
+- `arg-type`: configure argument behavior. Built-ins include `enable`, `enable-path`, `with`, `with-path`, `custom`, and `none`. Full strings are allowed.
+- `zend-extension`: true for Zend extensions such as opcache/xdebug.
+- `build-shared`: whether shared builds are allowed.
+- `build-static`: whether static builds are allowed.
+- `build-with-php`: true when built inside the PHP source tree.
+- `display-name`: value used for `php --ri` smoke tests and license display; empty string skips the `--ri` check.
+- `os`: allowed OS families: `Linux`, `Darwin`, `Windows`.
+
+Configure string placeholders:
+
+- `@build_root_path@`: absolute buildroot path.
+- `@shared_suffix@`: `=shared` in shared builds, empty in static builds.
+- `@shared_path_suffix@`: `=shared,{buildroot}` in shared builds, `={buildroot}` in static builds.
+
+## Platform Suffixes
+
+Many fields support platform suffixes:
+
+- `@unix`: Linux and macOS.
+- `@linux`: Linux only.
+- `@macos`: macOS only.
+- `@windows`: Windows only.
+
+For Linux, specific fields override generic fields in this order: `field@linux`, then `field@unix`, then `field`.
+
+Use suffixes for declarative differences in dependencies, headers, libraries, pkg-configs, extension args, and suggestions.
+
+## Validation and Tests
+
+Run config validation for most package edits:
+
+```bash
+php bin/spc dev:lint-config
+```
+
+Run focused tests after config or registry changes:
+
+```bash
+vendor/bin/phpunit tests/StaticPHP/Config tests/StaticPHP/Registry tests/StaticPHP/Util/DependencyResolverTest.php --no-coverage
+```
+
+Run broader checks for framework or class changes:
+
+```bash
+composer test
+composer analyse
+```
+
+Build commands are expensive. Use them for user-provided repros, package-specific fixes, or when validation cannot prove the behavior:
+
+```bash
+php bin/spc build:libs "openssl,curl" -vvv
+php bin/spc build:php "bcmath,openssl,curl" --build-cli -vvv
+```

AGENTS.md

@@ -0,0 +1,59 @@
+# StaticPHP v3 Agent Guide
+
+StaticPHP is a PHP CLI application for building static PHP binaries, PHP SAPIs, extensions, libraries, helper tools, and project bundles. Prefer the v3 architecture under `src/StaticPHP`, `src/Package`, `config/pkg`, and `config/artifact`.
+
+This file is the shared entry point for coding agents such as Codex, OpenCode, Claude-compatible agents, and GitHub Copilot agents. GitHub Copilot also has `.github/copilot-instructions.md`.
+
+## Skills
+
+Detailed task workflows live in `.github/skills`. Use them when the task matches:
+
+- `.github/skills/staticphp-package-maintenance`: add, modify, review, or validate package, artifact, extension, library, target, or tool definitions.
+- `.github/skills/staticphp-build-troubleshooting`: diagnose build, download, doctor, shell, terminal, CI, smoke-test, or log failures.
+
+If your agent does not automatically discover skills from `.github/skills`, read the matching `SKILL.md` manually before working on that task.
+
+## Project Map
+
+- `bin/spc`: primary CLI entrypoint.
+- `composer.json`: PHP 8.4+, Symfony Console, DI, YAML, logger; useful scripts are `composer test`, `composer analyse`, `composer lint-config`, and `composer cs-fix`.
+- `spc.registry.yml`: built-in `core` registry.
+- `config/pkg/ext`: PHP extension package YAML, usually named `ext-*.yml`.
+- `config/pkg/lib`: library package YAML.
+- `config/pkg/target`: final build target and virtual target YAML.
+- `config/pkg/tool`: helper tool package YAML.
+- `config/artifact`: standalone artifact YAML for shared or complex sources/binaries.
+- `log/`: build and shell execution logs (`spc.output.log`, `spc.shell.log`, and per-package CMake/config logs); controlled by `SPC_LOGS_DIR` and `SPC_ENABLE_LOG_FILE`.
+- `src/StaticPHP`: framework core: registry loading, config validation, dependency resolution, package install/build pipeline, doctor, toolchains, runtime shell/executors, exceptions.
+- `src/Package`: package-specific build logic registered by PHP attributes.
+- `src/globals`: constants, helper functions, patches, smoke tests, bundled license text.
+- `tests`: PHPUnit tests for config, registry, artifacts, dependency resolver, DI, commands, and utilities.
+- `docs/en/develop` and `docs/zh/develop`: developer documentation. Some pages may be TODO; verify against source when behavior matters.
+
+## Working Rules
+
+- Keep changes scoped to the requested package, artifact, command, docs, or tests.
+- Prefer existing package patterns over new abstractions. Search for a similar package first.
+- Use structured YAML config; do not encode dependency logic in PHP when config fields are enough.
+- Match package names exactly: extension packages use `ext-` in config and dependencies; `#[Extension('curl')]` expands to `ext-curl`.
+- Use platform suffixes such as `@unix`, `@linux`, `@macos`, and `@windows` instead of runtime conditionals when the difference is declarative.
+- Add or update PHP package classes only when build commands, validation, custom configure args, hooks, or source patching are required.
+- Do not edit generated build directories (`buildroot/`, `source/`, `downloads/`, `pkgroot/`) as a fix.
+
+## Validation
+
+For config or package changes, run CS checks first:
+
+```bash
+bin/spc dev:lint-config
+composer cs-fix
+```
+
+For broader PHP code changes, also run:
+
+```bash
+composer test
+composer analyse
+```
+
+Use build commands only when needed for the task or when the user provided a repro, because full static builds can be slow and platform-sensitive.

config/env.ini

@@ -53,8 +53,8 @@ PHP_BUILD_PROVIDER="StaticPHP ${SPC_VERSION}"
 SPC_ENABLE_LOG_FILE="yes"
 ; The LOG DIR for spc logs
 SPC_LOGS_DIR="${WORKING_DIR}/log"
-; Preserve old logs when running new builds
-SPC_PRESERVE_LOGS="no"
+; Preserve old logs when running new builds (code checks SPC_PRESERVE_LOG, not SPC_PRESERVE_LOGS)
+SPC_PRESERVE_LOG="no"
 
 ; EXTENSION_DIR where the built php will look for extension when a .ini instructs to load them
 ; only useful for builds targeting not pure-static linking