v0.5.0

Gate-trust: make the three verdicts unmistakable end-to-end, tighten REWORK vs
REVIEW routing, and stop losing good-but-optional findings. Folds #55 (local
shape parity #53 + unambiguous REWORK vs REVIEW #54) and #57 (verdict
classification #56 + check first-run ergonomics #49 + doc refresh #48).

Added

• Distinct per-verdict surfaces (#54). A single verdict-presentation table
  (src/verdict.ts) is now the sole source of how every surface renders a
  verdict, so REWORK and REVIEW can never again collapse into one identical red
  "failure" check. The CI gate publishes a per-verdict check-run with a
  distinct NAME and CONCLUSION:

  • Plumbline: PASS — success
  • Plumbline: REWORK — blocked, do not merge — failure (agent's turn)
  • Plumbline: REVIEW — awaiting human approval — action_required (human's
    turn; renders distinctly from a plain failure in the PR UI)

  The PR-comment title and the Checks-tab annotation are derived from the same
  table. Motivated by amos-platform#211, where a REWORK was merged by accident
  because it looked identical to a REVIEW.

• Materiality axis + 3-way classification (#56). Findings gain a
  material / optional / noise axis on top of class + actor. Routing is now
  deterministic and sequential: any material, agent-fixable finding ⇒
  REWORK (even on a protected / self_modifying surface); REVIEW is
  emitted only when no agent-fixable items remain (a pure human decision list);
  noise is dropped.

• Optional-but-good findings become tracked follow-up issues (#56).
  Optional findings are no longer silently skipped as advisory notes — the gate
  files a deduped follow-up GitHub issue for each (deduplicated by a stable
  per-finding fingerprint via issue search). Best-effort: filing never throws,
  so a repo without issues: write degrades gracefully rather than failing the
  gate. Requires issues: write (and checks: write for the per-verdict
  check-run) on the gate job.

• plumb check finds an untracked receipt (#49). Local pre-flight
  auto-discovery now consults git status --porcelain, so plumb check works
  before git add. LOCAL only — CI stays diff-based.

Changed

• Doc refresh (#48). README Status updated to the v0.4.x/v0.5 shape; both
  AGENTS.md TL;DRs rewritten around the single idempotent receipt --write step.

Compatibility

• Back-compatible for consumers. The new check-runs and follow-up-issue
  filing require checks: write / issues: write on the gate job; without them
  the gate degrades gracefully (no per-verdict check-run / no follow-up issues)
  rather than failing. No receipt-schema or gate exit-code change.