artgraph-bootstrap

## Purpose Cold-starts traceability on a project that has few or no REQ tags today. Where a covering test already exists for a candidate requirement, the agent (probabilistically) proposes ONLY the test-side closure — a `- REQ-NNN:` spec entry plus a `[REQ-NNN]` marker on the covering test title — and does NOT touch implementation code; once the user approves and the tests run, the coverage-derived `exercises` edge corroborates (or contradicts) the tag mechanically, no LLM needed. Only in areas with no test to tag at all does the agent fall back to the older code-side proposal (spec entry + `// @impl REQ-NNN`), and the proposal must say so explicitly. This split — LLM proposes, artgraph verifies deterministically — is the **determinism boundary**: link generation may be probabilistic, but link verification must be reproducible without an LLM in the loop. The Skill never writes trace tags without first showing a diff and getting explicit user approval. ## Preconditions Committed clean working tree recommended: uncommitted changes cannot be cleanly rolled back with `git reset` if the user approves apply. ## Steps Every Bash tool call is a **fresh shell** — variables do not persist across calls; carry the detected PM and any per-step counts forward as plain text in your reasoning, not shell variables. `<PM-exec>` is the project's package runner — `npx artgraph`, `pnpm exec artgraph`, `bunx artgraph`, or `deno run -A npm:artgraph/cli` — substitute the one detected by `_share...