docs: mark P2.11 complete in ROADMAP

Structured task packet format shipped at dbfc9d5:
- TaskPacket struct with validation and serialization
- TaskScope resolution (workspace/module/single-file/custom)
- Integration into tools/src/lib.rs
- task_registry.rs coordination for runtime task tracking

ROADMAP.md

@@ -285,7 +285,7 @@ Priority order: P0 = blocks CI/green state, P1 = blocks integration wiring, P2 =
 8. Failure taxonomy + blocker normalization — **done**: `WorkerFailureKind` enum (`TrustGate/PromptDelivery/Protocol/Provider`), `FailureScenario::from_worker_failure_kind()` bridge to recovery recipes
 9. Stale-branch detection before workspace tests — **done**: `stale_branch.rs` module with freshness detection, behind/ahead metrics, policy integration
 10. MCP structured degraded-startup reporting — **done**: `McpManager` degraded-startup reporting (+183 lines in `mcp_stdio.rs`), failed server classification (startup/handshake/config/partial), structured `failed_servers` + `recovery_recommendations` in tool output
-11. Structured task packet format
+11. Structured task packet format — **done**: `task_packet.rs` module with `TaskPacket` struct, validation, serialization, `TaskScope` resolution (workspace/module/single-file/custom), integrated into `tools/src/lib.rs`
 12. Lane board / machine-readable status API — **done**: Lane completion hardening + `LaneContext::completed` auto-detection + MCP degraded reporting surface machine-readable state
 13. **Session completion failure classification** — **done**: `WorkerFailureKind::Provider` + `observe_completion()` + recovery recipe bridge landed
 14. **Config merge validation gap** — merged settings (especially `hooks`) can produce non-string array values that fail validation at `claw --help` time; error path: `deep_merge_objects()` → malformed hooks → `optional_string_array()` parse error