docs(claude): add CLAUDE.md pointing at shared sirerun/docs repo

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working in the mint repo.
+
+The most important goal is that we need to make Sire have $5B ARR by end of 2031, if any effort derails us, let me know and discard it.
+
+## What this repo is
+
+`mint` is a Go CLI and library that generates MCP (Model Context Protocol) servers from OpenAPI 3.x specs. It also provides a registry for discovering and publishing MCP servers, plus deployment helpers for managed/GCP/AWS hosting. Entry point: `cmd/mint/main.go`.
+
+## Shared Docs Repo
+
+Cross-repo planning and documentation lives in a dedicated git repo: `github.com/sirerun/docs`, checked out at `/Users/dndungu/Code/sirerun/docs/`. This is the single source of truth for `plan.md` (cross-repo execution plan used by /plan and /apply), `adr/` (cross-repo ADRs), `devlog.md` (investigations/benchmarks), `usecases.md`, `design.md`, and `content-classification.md`.
+
+Work in this project is typically cross-repo. Always read/update the plan in the shared docs repo, not a per-repo copy. Commit docs changes via PR to `sirerun/docs` independently from code PRs.
+
+## Commands
+
+```bash
+go test ./...
+go build ./cmd/mint
+golangci-lint run --timeout=10m
+```
+
+## House style
+
+- Prefer Go standard library over third-party packages.
+- Use table-driven tests with the standard `testing` package (no testify).
+- Conventional Commits for commit messages.