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* chore(#2143): bounded-mutation seam (withSection/withPhaseSection) + phase.cts migration — Phase 2 Phase 2 of epic #2143 (ADR-2143 §4): add a bounded-mutation primitive so a per-phase ROADMAP edit is structurally confined to that phase's own section, and migrate the phase-scoped mutation sites in `phase.cts` onto it. - `src/markdown-sectionizer.cts`: `withSection(content, target, edit, opts?)` — resolves a section via `collectSection` and applies `edit` to ONLY that section's body, re-serialising via `replaceSection`. The edit callback sees only the section body, so any regex it runs is physically confined. - `src/roadmap-parser.cts`: `withPhaseSection(content, phaseId, edit)` — resolves a phase's `### Phase N` detail-section heading via the #2121 phase-id source and delegates to `withSection`. Heading match is anchored to the heading start (a sibling phase whose title mentions the number is not hijacked) and bounds at the next ATX heading of any level (`levelBounded:false`). - `src/phase.cts`: `mutateMilestonePhase`'s plan-count and per-plan-checkbox writes now route through `withPhaseSection` — structurally retiring the #2130 / #2067 / #2080 boundary-crossing class for these sites. The phase-LIST checkbox is intentionally left milestone-slice-scoped (it lives outside any `### Phase N` detail section). Cross-phase renumbering is untouched. - Property test (fast-check): editing phase k leaves every sibling section byte-identical; regression tests for title-collision + mixed heading depth. Behaviour-preserving (verified by old-vs-new differential runs on real fixtures). Extend-never-mutate (ADR-2143 §2). Registration: CONTEXT.md + docs/INVENTORY.md export lists. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * chore(#2243): backfill changeset PR number (#2250) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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