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

AGENTS.md

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+# 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.
+- `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.