Files
msd-core/tests
Tom Boucher 1512e6f415 refactor(#1782): ADR-1769 Phase 2 — advancePlan migration onto Transition Module (#1783)
Migrates cmdStateAdvancePlan (~80-line RMW callback) onto the
transitionCore dispatch established in Phase 1 (#1775):

- src/state-transition.cts:
  - Add {kind: 'advancePlan'} to StateTransitionIntent union
  - Extend StateTransitionResult with optional data field for
    intent-specific output (advanced, currentPlan, totalPlans)
  - advancePlanCore: parses legacy + compound plan formats, handles
    advance vs phase-complete branching, strips frontmatter before
    body mutation (#1255 pattern — codex Phase 2 HIGH finding),
    uses stateReplaceFieldIfTemplate for template-default-aware
    field replacement (Knuth invariant), mutates ## Current Position
    section via mutateCurrentPositionForAdvance
  - mutateCurrentPositionForAdvance: inlined section mutation (avoids
    circular dep with state.cjs's updateCurrentPositionFields)

- src/state.cts:cmdStateAdvancePlan: collapsed to 30-line dispatch

- tests/state-transition.test.cjs: 5 characterization tests
  (advance, phase-complete, error, compound format, frontmatter #1255)

Codex gpt-5.5/high review: 1 HIGH blocking (frontmatter strip — fixed),
1 medium follow-up (StateTransitionResult.data shape discrimination —
noted for Phases 3-7).

gsd-test: 21893/21893 PASS (Linux docker).

Closes #1782
2026-06-27 14:22:14 -04:00
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