Migrate cmdStatePlannedPhase and cmdStateMilestoneSwitch (state.cts) onto the STATE.md Transition Module substrate (ADR-1769, epic #1769). - Add {kind: 'plannedPhase'} and {kind: 'milestoneSwitch'} to StateTransitionIntent, with plannedPhaseCore and milestoneSwitchCore in src/state-transition.cts (consulting the field-classification table). - plannedPhaseCore owns the template-aware Status/Last Activity updates, Total Plans in Phase, Last Activity Description, and the Current Position section (via the inlined mutateCurrentPositionForAdvance twin). The adapter keeps the resync:false readModifyWriteStateMd wrapper (#500 RC1). - milestoneSwitchCore owns the new-milestone reset: rebuilt frontmatter (milestone/name/status='planning'/zeroed progress) + Current Position body reset. The adapter keeps acquireStateLock + platformWriteSync (NOT readModifyWriteStateMd — milestoneSwitch rebuilds frontmatter directly). - Collapse both callbacks to transitionCore dispatches. The now-dead updateCurrentPositionFields helper and KNOWN_STATUS_PATTERNS import are removed (their behavior lives in the transition module's mutateCurrentPositionForAdvance). - Characterization tests pin the template-aware preserve-authored invariant, Total Plans, Last Activity narrative, Current Position update, and the full milestone reset (frontmatter + position body + gsd_state_version preserve + Accumulated Context preserve). All 58 transition + 177 state + phase + bug-2630/bug-905 regression tests pass. Closes #1786
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