Migrate record-reorder onto the record-mutation lifecycle driver

[HynLcc]

Third record-mutation member. record-reorder rides the existing
record-mutation-lifecycle driver unchanged (useRecordWindow: true).

Scope

• Runner kind: record-reorder (1 case) → record-reorder/10k-move-last-1k-to-front

Change

• record-reorder.runner.ts keeps only its case-specific diff logic (seed-cache
  order fixture, the measured block-reorder + routing + position-verification
  bundle, result assembly, restore-order-or-drop cleanup) and wires into the
  driver via a spec. A small buildResult adapter maps the driver's
  primaryMeasurement onto the runner's existing reorderMeasurement param, so
  the artifact assembly is byte-for-byte untouched.

G1 mask additions (scripts/diff-artifacts.mjs)

record-reorder is newly G1-diffed, and its baseline A vs B surfaced run-to-run
noise the comparator did not yet mask. All are genuinely volatile on unchanged
code, none semantic:

• details.verification.firstRecordId / anchorRecordId / movedRecordIds:
  generated record ids (added to GENERATED_ID_KEYS, like the existing
  recordId / createdRecordIds).
• details.prepare.seedBatchDurations: raw per-batch seed timings (masked like
  every other *Ms / maxSeedBatchMs duration).

The semantic reorder proof stays visible and asserted: perturbing
verification.checkedPositions[].expectedOriginalRowNumber still fails the diff.

Verification

• pnpm check: green.
• Local v1+v2 baseline A, baseline B, candidate: all pass.
• G1 diff: baseline A↔B and A↔candidate pass on both engines (with the noted
  mask additions, confirmed sufficient by A↔B).
• Negative tests: phases[0].name AND checkedPositions[].expectedOriginalRowNumber
  both fail the diff; a masked movedRecordIds tamper correctly passes.
• The updated comparator still passes for the already-migrated record-create /
  record-update artifacts (no comparator regression).
• record-reorder candidate: v1/v2 pass, phases [prepare, moveLast1kToFrontMs, seedReady], operation move-last-block-to-front, routing matched
  (feature=reorderRecords), checkedPositions=4.

Protected case-contract surface (cases/**, registry.ts, framework/types.ts
config, framework/artifacts.ts schema, ../teable-ee) untouched. The
scripts/diff-artifacts.mjs mask change is explicitly task-sanctioned and masks
only run-to-run-volatile fields.

🤖 Generated with Claude Code