chore(rules): add Tier-2 plan-PR inspiration-discipline rule

[SutuSebastian]

Summary

Promotes the cite-the-source-path discipline from honor-system (per PR #58 § 4) to an auto-attached Tier-2 rule per the agents-tier-system framework.

Why now: parked follow-up from PR #58 Q10 grill. Plan-PR + recipe authors get the inspection-source list primed automatically when authoring under docs/plans/** or templates/recipes/** — without paying always-on context cost on every turn.

What lands

• .agents/rules/plan-pr-inspiration-discipline.md — Tier-2 rule body (~30 lines per the Tier-2 priming guideline). Frontmatter:
  • globs: ["docs/plans/**", "templates/recipes/**"]
  • alwaysApply: false
  • description with trigger phrases (LSP, SQLite, oxc, MCP, plan PR, recipe authoring) for Cursor's intent-discoverability.
• .cursor/rules/plan-pr-inspiration-discipline.mdc — symlink to the source file per agents-first-convention.
• .agents/rules/agents-tier-system.md Tier-2 list updated with the new rule entry + deep-link to the canonical inspection list.

Rule body covers

1. Why peer-tool cloning dilutes codemap's niche — cohort positioning brief; codemap's intrinsic differentiation (predicate-as-API + pure structural + JS/TS/CSS-deep extraction).
2. Top inspiration sources — LSP spec, SQLite docs, oxc AST node reference, Lightning CSS docs, JSON-RPC 2.0 + MCP spec, TC39 proposals, existing codemap surface.
3. Cite-the-source examples — proper pattern (cite spec, not peer source path) with three examples.
4. When-NOT-to-cite-a-peer escape hatch — empirical user-demand signals are valid market research; "X tool does Y so we should too" is the anti-pattern.

Doc-governance compliance

• Authored in .agents/rules/ first, symlink in .cursor/rules/ per agents-first-convention.
• Tier-2 placement justified per agents-tier-system Tier 2: rule has always-on principles (cite-spec discipline) that should fire whenever the relevant files are in scope.
• Pairs with the research-note § 4 list as the deep reference (no separate skill needed; the list IS the deep reference). Same shape as the docs-governance Tier-2 rule + skill.
• Durability checked per the agents-tier-system durability sub-rules: cites reference docs (README.md, architecture.md) by name (durable), uses no PR / commit hashes as primary anchors, no source-line-number references.

Test plan

• bun run format:check passes
• Symlink resolves correctly (ls -la .cursor/rules/plan-pr-inspiration-discipline.mdc → points at source)
• Cross-references to research note § 4 anchor resolve
• CodeRabbit review

Out of scope

• docs/research/fallow.md closure — PR #61.
• docs/roadmap.md non-goals lockstep — PR #62.
• (a) FTS5 + Mermaid plan PR — PR #60.
• (b) C.9 plugin layer plan PR — PR #59.

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Latest commit: 2105fa0

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ab080b2e-083b-4e5f-b6dc-9060ef022da2

📥 Commits

Reviewing files that changed from the base of the PR and between 54e3a2c and 2105fa0.

📒 Files selected for processing (3)

• .agents/rules/agents-tier-system.md
• .agents/rules/plan-pr-inspiration-discipline.md
• .cursor/rules/plan-pr-inspiration-discipline.mdc

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch rule/plan-pr-inspiration-discipline

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