* fix(#4213): keep STATE.md progress surfaces synchronized
* fix(#4213): clamp the shared progress bar and keep bold-first priority, changeset + property tests
- formatProgressMachineSegment clamps through clampPercentFromFraction
(ADR-3180 Decision 7 kernel) with a 0 floor, so a hand-edited
out-of-range persisted percent renders a clamped bar instead of
throwing RangeError on repeat() inside the write seam
- stateReplaceProgressPercent restores the #2177 bold-first priority:
**Progress:** anywhere in the body wins; a plain ^Progress: line is
the fallback, so free text starting with Progress: cannot capture
the rewrite ahead of the real status line
- cross-reference comment names the three consumers and the
cmdStateSync sanctioned exception (ADR-3408 §8.3)
- CONTEXT.md: applyPostSyncPreservation reconciliation documented in
the STATE.md Transition Module entry
- property tests (never-throws/well-formed, idempotency, round-trip,
bold-first) + two regression rows through the CLI
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Co-authored-by: Tom Boucher <trekkie@nomorestars.com>
