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)
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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