feat: rank exact definition sites and release v0.7.0

[aryamthecodebreaker]

What changed

• add bounded definition-site evidence for distinctive task identifiers and exact code/literal fragments
• preserve truncated literals from public issue excerpts and attach explainable ranking reasons
• cap extraction at 24 identifiers and 8 literal fragments, and precompile identifier patterns once per ranking run
• add focused ranking, extraction, noise, and bound regressions
• refresh generated Action/workspace artifacts and the frozen external result
• prepare coherent v0.7.0 package, MCP, Action, README, website, changelog, launch-kit, and growth-baseline metadata

Why

The frozen Zod #5944 case named cidrv6 and included the start of the faulty regex, but token overlap ranked JSON-schema consumers above the file that defined the pattern. The ranker had no punctuation-preserving literal evidence and no explicit definition-site signal.

The new signal is general and explainable: code-shaped identifiers can support their definition, and a distinctive exact fragment receives an additional boost only when it occurs at a nearby definition/assignment. Generic short names such as level are deliberately excluded from identifier evidence.

Measured impact

The unchanged six-repository benchmark moves from:

• Top-1: 3/6 (50%) → 4/6 (67%)
• Top-3: 5/6 (83%) → 6/6 (100%)
• Top-5: 5/6 (83%) → 6/6 (100%)

Zod #5944 moves from outside Top-5 to Top-1. No task text, expected path, case, or selection rule changed. The checked-in per-case output remains public, and the docs explicitly avoid turning six cases into a general accuracy claim.

Validation

• npm run ci
  • 122 tests
  • typecheck and ESLint
  • high/critical production audit gate (two known moderate findings remain in the MCP SDK's unused Hono static adapter)
  • CLI, Action, and workspace smokes
  • production Next.js build
  • Action metadata, MCP manifest, and generated bundle checks
  • internal evaluation gate
  • deterministic 1,000-file scanner check
• node scripts/evaluate-external.mjs --gate --check-recorded
  • Top-1 0.667, Top-3 1.0, Top-5 1.0

Closes #59