Makes graph-native post-merge the default and cuts the merger's legacy post-merge
path over so post-merge runs exactly once (via the graph), with migration data prep.
- experimentalFeatures.graphNativePostMerge → default ON; merger
hasEnabledPostMergeWorkflowSteps/runPostMergeWorkflowSteps become inert when on
(no double-run; proven by a new no-double-run test). Merger code kept (U7c removes it).
- Migration 130 (SCHEMA_VERSION 129→130) rewrites each task's enabledWorkflowSteps
entries that are legacy built-in pre-merge workflow_steps row ids → the optional-group
node id (browser-verification/code-review); dedupes; idempotent; identity-stable;
leaves node-ids/compiled/custom entries untouched. Table KEPT (U7c drops it).
- Investigation (real DBs): NO custom/plugin post-merge steps exist; the only post-merge
step is compound-engineering's 'document' graph node — so the merger no-op strands
nothing. Custom-step re-pointing was verified unnecessary and skipped.
Safe-to-drop in U7c still blocked by live readers: merger post-merge fns, store CRUD,
migrateLegacyWorkflowSteps/readConfig materialization (executor recovery reader is
already null-safe→advisory).
Plan U7b.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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