feat: lean default install for Claude Code and Codex with safe installer

Adds a marked global rules block, project AGENTS.md/CLAUDE.md template, an on-demand lean-review skill, a dry-run-first stdlib installer with backups, and tests using temp homes. README quick start no longer moves ~/.claude; legacy library stays opt-in. Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
2026-09-30 13:43:26 -04:00
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+# Project instructions
+
+Shared by Claude Code (via `CLAUDE.md`) and Codex. Keep this file short: add a line only if removing it would cause a mistake.
+
+## Commands
+
+- Test: `TODO`
+- Lint/format: `TODO`
+- Type check: `TODO`
+
+## Rules
+
+- Run the commands above after each change; report real output, not assumptions.
+- Behaviour changes and bug fixes start with a failing test.
+- Before reporting a defect in existing code, check callers and guards that could already prevent it; report only with a concrete failing input.
+- Before finishing, review your own diff once; use the `lean-review` skill for a consolidated review.
+- Use security review only for auth, secrets, input parsing, or dependency changes.
+- Layer detail in nested `AGENTS.md` / docs and link to it; do not inline it here.