fix(coding-agent): label Mnemopi recall-query truncation as mnemopi.recall - #15413

Another addition to the recall logging. For debugging, of course.

What

Follow-up to #15001. Two of the three Mnemopi recall paths closed the mnemopi.recall span after composeRecallQuery() and then called truncateRecallQuery() unlabeled:

• recallForCompaction() (mnemopi/state.ts)
• maybeRecallOnAgentStart(), the background first-turn recall

Both now compose and truncate inside one mnemopi.recall span, the same way beforeAgentStartPrompt() already did. Nothing else changes: the span wraps the same synchronous expressions, and no await moves.

Why

Codex flagged this on #15001 after its last push (thread), and #15001 was merged before it was fixed. truncateRecallQuery() repeatedly unshifts and joins context lines while filling the budget. With a raised mnemopi.recallMaxQueryChars and a long, newline-heavy context, a stall there was logged as phase: "unknown" instead of mnemopi.recall.

Refs #15027.

Testing

• New case in test/mnemopi-loop-phase-coverage.test.ts. It spies on truncateRecallQuery, records currentLoopPhase() on each call, and runs all three recall paths against a real Mnemopi bank:
  • on main: fails with ["mnemopi.recall", undefined, undefined]
  • with the fix: passes with mnemopi.recall three times
• Windows 11 x64, Bun 1.4.2: bun run check passes in packages/coding-agent. These suites are 0 fail:
  • mnemopi-loop-phase-coverage (2)
  • memory-tools (75)
  • memory-recall-resume (20)
  • agent-session-memory-backend (24)
  • agent-session-message-pipeline (80)
  • agent-session-queued-policy (47)
  • agent-session-dispose-concurrent (5)
  • hindsight-backend (31)
  • internal-urls/memory-protocol (32)
  • memory-redaction (9)
  • autolearn-tools-gating (18)
• mnemopi-recall-features fails 1 of 2 identically on main: the temp-dir cleanup in afterEach hits a Windows file lock.

• bun check passes
• Tested locally
• CHANGELOG updated with the required attribution (if user-facing; internal issue fixes use issue links, external contributions add the PR link and contributor credit after creation)