nfemmanuel/iranti

Bundle 5: A6 objective memory + M5 auto-checkpoint signal

A6 — SessionObjective

Pure deriveSessionObjective() helper produces a structured session objective from the task string, recent messages, and optional checkpoint nextStep continuation. It attaches to WorkingMemoryBrief so every attend surface can see what this session is actually about. Pairs with A1 to form session executive function.

Confidence tiers:

• 1.0 — action verb + signal tokens
• 0.95 — checkpoint continuation (nextStep ≥ 6 chars)
• 0.6 — one of verb/signals
• 0.3 — neither

Primary cap: 120 chars.

M5 — AutoCheckpointSignal

Pure detectAutoCheckpointTrigger() helper emits a soft recommendation signal when pressure builds, mirroring M3 writeNudge. It is a signal, not auto-persistence — hosts stay in control.

Priority:

• drift_detected (critical)
• turns_without_write (strong)
• tool_cost_threshold (suggested)

Exported thresholds: AUTO_CHECKPOINT_TOOL_COST_THRESHOLD = 15, AUTO_CHECKPOINT_TURN_THRESHOLD = 3. Threaded through all three attend return paths; gated off post-response. The message embeds sessionObjective.primary so the host knows what to checkpoint about.

Tests

27/27 green in tests/attendant/run_b5_objective_autocheckpoint_tests.ts:

• 10 A6 pure unit
• 8 M5 pure unit
• 2 A6 integration
• 7 M5 integration

Regression gate

9/10 suites clean: b4-skip-drift, tool-call-retrieval, mid-turn-attend, m2-tool-result-autowrite, file-change-recall, a4-plan-proposal, user-operating-rules, compliance-task-relevance, artifact-capture. memory-attribution is a pre-existing local DB schema drift (validFrom column missing from local DB), unrelated to B5 — confirmed by git stash baseline test.

Backlog progress

5 of 8 bundles shipped. Remaining: Bundle 6 (A3 + A5), Bundle 7 (S5 + S6), Bundle 8 (M6).