Migrate record-create onto the record-mutation lifecycle driver

[HynLcc]

Second record-mutation example. Promotes the record-update driver into a real
family driver and migrates record-create.

Scope

• Runner kind: record-create (1 case) → record-create/mixed-1k-20fields-bulk-create
• Also touches the shared driver, so record-update is re-verified in this PR.

Change

• Rename record-update-lifecycle.ts → record-mutation-lifecycle.ts and
  generalize the parts that differ between the two members:
  • useRecordWindow flag (record-update wraps the bulk write in a record
    window; record-create has none),
  • baseId threaded into assertSeedReady / runMeasuredOperation,
  • primaryMeasurement passed to cleanup so a runner can undo exactly what
    the measured op produced (record-create deletes the created records).
• record-create.runner.ts keeps only case-specific diff logic (seed-cache
  empty-table fixture, payload build, sql-count verification, the bundled
  measured op, result assembly, delete-created-or-drop cleanup) and wires into
  the driver via a spec.
• record-update.runner.ts switches to the renamed driver with
  useRecordWindow: true.
• Tracker: record-create Not migrated → Migrated; both rows point at
  record-mutation-lifecycle.ts. Counts 13→14 / 35 runner kinds · 15→16 / 55 cases.

Verification

• pnpm check: green.
• Local v1+v2 baseline A, baseline B, candidate for BOTH cases: all pass.
• G1 artifact diff (scripts/diff-artifacts.mjs): baseline A↔B and
  A↔candidate pass for record-create AND record-update on both engines —
  proving the shared-driver change did not regress record-update. No mask
  changes.
• Semantic negative test: perturbing phases[0].name makes the diff fail.
• record-create candidate: v1/v2 pass, phases [prepare, bulkCreate1kMs, seedReady], routing matched (feature=createRecord), sql-count verification
  sqlRowCount=1000.

Protected surface (cases/**, registry.ts, framework/types.ts config,
framework/artifacts.ts schema, scripts/diff-artifacts.mjs, ../teable-ee)
untouched.

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