Normalize task lifecycle timestamps on create, update, and restore so startedAt/lastEventAt/endedAt cannot precede createdAt in audit-visible records.
Downgrade retained lost tasks with future cleanupAfter from audit errors to warnings while keeping expired or unstamped lost tasks as errors.
Verification: pnpm exec oxfmt --write --threads=1 src/tasks/task-registry.ts src/tasks/task-registry.test.ts src/tasks/task-registry.audit.ts src/tasks/task-registry.audit.test.ts
Verification: node scripts/test-projects.mjs src/tasks/task-registry.test.ts src/tasks/task-registry.audit.test.ts (task-registry.audit.test.ts 4 passed; task-registry.test.ts 45 passed)
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