refactor(#651): consolidate verification-status routing into one queryable seam (#755)

* refactor(#651): consolidate verification-status routing into one queryable seam

The passed/gaps_found/human_needed verification status was re-encoded as
bare strings across three prose surfaces (gsd-verifier emits, execute-phase
routes, ship gates), each independently deciding the per-status next action
with no parity coupling — the DEFECT.GENERATIVE-FIX class.

Give the enum one home: src/verification.cts (-> bin/lib/verification.cjs)
exposing `gsd_run query verification.status <phaseDir>` returning a typed
{status, next_action, next_command}. ship.md and execute-phase.md now consume
the query instead of re-deriving the routing in prose; gsd-verifier.md points
at the shared vocabulary as the single emitter (values unchanged).

Also fixes the latent broad-grep status misread (DEFECT.FRONTMATTER-SCALAR-
BROAD-GREP): execute-phase.md read `grep "^status:"` over the whole report, so
a body `status:` line could misroute a valid phase. Extraction is now
frontmatter-scoped in one place. A parity test fails if a verifier status
gains no route. Lands the two CONTEXT.md DEFECT entries captured on the issue.

Closes #651

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#651): set changeset pr to 755

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

agents/gsd-verifier.md

@@ -576,6 +576,8 @@ Classify status using this decision tree IN ORDER (most restrictive first):
 
 **passed is ONLY valid when the human verification section is empty.** If you identified items requiring human testing in Step 8, status MUST be human_needed.
 
+> **Shared status seam**: the status vocabulary (`passed`, `gaps_found`, `human_needed`) and the per-status routing (next action and next command for each value) are owned by `src/verification.cts` via `gsd_run query verification.status`. This agent is the single emitter of the frontmatter status field; consumers (ship.md, execute-phase.md) read routing from that query instead of re-deriving it.
+
 **Score:** `verified_truths / total_truths`
 
 ## Step 9b: Filter Deferred Items