chore: add CLAUDE.md symlink, .cursorignore, cursor rule

CLAUDE.md → AGENTS.md so Claude Code loads project context.
.cursorignore excludes dist/ and node_modules/ from AI indexing.
Cursor rule documents when to prefer rethunk-github MCP tools.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AlbinoGeek

.cursor/rules/rethunk-github-mcp.mdc

@@ -0,0 +1,27 @@
+---
+description: Use the rethunk-github MCP server for GitHub queries in this repo
+alwaysApply: true
+---
+
+# rethunk-github MCP (this workspace)
+
+Dogfood and all client wiring: **[docs/install.md](../../docs/install.md)** (*From source*, *Cursor*, *Troubleshooting*). Tools / JSON / error codes: **[docs/mcp-tools.md](../../docs/mcp-tools.md)**. Auth, dev, CI, publish: **[HUMANS.md](../../HUMANS.md)**. Do not restate install or tool tables in this rule.
+
+**Do not link or re-open `AGENTS.md` from this rule:** it is already injected as project agent context when present.
+
+## When to use it
+
+Prefer **`rethunk-github_*`** tools over shell `gh` / ad-hoc GitHub API loops for:
+
+- Multi-repo status checks → `rethunk-github_repo_status`
+- Personal work queue → `rethunk-github_my_work`
+- Pre-merge safety → `rethunk-github_pr_preflight`
+- Release scope → `rethunk-github_release_readiness`
+- CI failure triage → `rethunk-github_ci_diagnosis`
+- Org-wide health → `rethunk-github_org_pulse`
+
+## When shell gh is still fine
+
+Commands the tools do not cover (e.g. `gh pr create`, `gh issue edit`, write operations), or when MCP is unavailable after a failed reload.
+
+If tools are missing: reload the MCP connection and follow **[docs/install.md](../../docs/install.md)** — *Troubleshooting* and *From source* (this clone).

.cursorignore

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+# Build output and dependencies — not useful for AI context
+dist/
+node_modules/

CLAUDE.md

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+AGENTS.md