fix(paired): stop silent halt on reviewer PROCEED + reviewer-unavailable

Two causes of the paired room "keeps stopping" symptom:
- Reviewer approvals worded as "PROCEED" were parsed as 'continue'
  (a change request), causing an owner TASK_DONE <-> reviewer PROCEED
  ping-pong until the deadlock cap. parseReviewerVerdict() now treats a
  leading PROCEED as approval so the turn finalizes after one round.
- When the Codex reviewer was unavailable, the owner's answer was held
  for review and the user saw nothing. Now the held owner answer is
  emitted with a "review skipped" notice on reviewer_codex_unavailable.

Verified: tsc --noEmit clean; 27 related vitest tests pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/db/bootstrap.test.ts

@@ -149,7 +149,9 @@ describe('initializeDatabaseSchema', () => {
       };
       for (let version = 1; version <= 15; version += 1) {
         database
-          .prepare('INSERT INTO schema_migrations (version, name) VALUES (?, ?)')
+          .prepare(
+            'INSERT INTO schema_migrations (version, name) VALUES (?, ?)',
+          )
           .run(version, collidedNames[version] ?? `legacy_${version}`);
       }
       // Precondition: the collided database is missing the progress columns.