Enforce character update version authority

[adrev]

Summary

• require optimistic versions for the shared character-update contract and reject versionless legacy socket writes with authoritative conflict state
• guard offline REST sheet writes by characters.version, return the committed row, and return HTTP 409 plus latest state on conflicts
• align lobby/offline sheet and spell-slot persistence with the same contract, restoring latest state after conflicts and refusing edits before version hydration
• correct the unused API helper from unsupported PATCH to the guarded PUT route
• add socket, REST, and client regressions for guarded success, stale/missing versions, and conflict restoration

Verification

• npm test (145 files, 1791 tests)
• npm run lint
• npm run build
• npm audit --audit-level=high (0 vulnerabilities)
• git diff --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5fcabb64-d38a-4417-a2c0-efbe62ed5183

📥 Commits

Reviewing files that changed from the base of the PR and between e7ad0d7 and a598cde.

📒 Files selected for processing (9)

• client/src/services/api.ts
• client/src/socket/emitters-offline.test.ts
• client/src/socket/emitters.ts
• server/src/__tests__/auth-boundaries.test.ts
• server/src/__tests__/character-update-versioning.test.ts
• server/src/routes/characters.ts
• server/src/socket/characterEvents.ts
• server/src/utils/validation.ts
• shared/src/types/socket-events.ts

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