Part **2 of 3** of the IR-driven lifecycle cutover (stacked on #2341;
top is #2335).
**Scope (80 files, packages/engine + cli/pi skill docs +
AGENTS/architecture):** graph-driven column moves via the
column-boundary controller (R1), single-mover scheduler/hold-release
trait cutover (KTD-2/KTD-9), trait re-keyed self-healing + merger with
the R7b confirmed-merge-must-finalize guarantee, graph-exclusive Plan
Review with leased dedup (R4/R5), the executeCore body-lift — zero
legacy re-entry — with fn_review_step + interceptor machinery deleted
and tombstone-ratcheted (R9), builtin workflow runtime fixes (missing
hold handler, unseamed-node column inheritance, no-merge completion
mover), the 6-column benchmark acceptance suite (11 tests) + 12-builtin
lifecycle sweep (94 assertions), and the executor test-harness
modernization. Also retires core's interpreter-cutover scaffolding whose
last consumer (the authoritative driver) dies here.
**Merge order:** #2341 → this → #2335. After #2341 merges, retarget this
to main.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
- Add completion handoff limbo recovery state to task storage and audit events for bounded self-healing retries
- Requeue eligible in-review tasks stuck after "Task marked done by agent" with grace-period, active-task, and merge-blocker safeguards
- Isolate executor run mutation context per task to prevent cross-task runId attribution leaks in scope-leak and completion logs
- Add reliability and executor regression tests covering limbo recovery, run-context isolation, and updated persistence behavior
Fusion-Task-Id: FN-4999
Preserves task rerun summaries so they persist across retries rather than being overwritten, with tests validating the persistence behavior and a patch changeset for `@runfusion/fusion`.
Fusion-Task-Id: FN-4106
