Guard death-save persistence with character versions

[adrev]

Summary

• compute ordinary death-save counters without mutating live combat first
• guard the character write with the selected characters.version and fail closed on conflicts/errors
• consume the once-per-round marker only after a confirmed save, including natural-20 healing and third-success stabilization
• preserve hidden-token stat/chat scoping and reconcile post-commit combat-state persistence

Validation

• Node 24 focused combat tests: 71 passed
• Node 24 full suite: 145 files, 1,806 tests passed
• production build passed
• ESLint passed with zero warnings
• npm audit --omit=dev: 0 vulnerabilities
• git diff --check: clean

No deployment in this PR.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f628bb0f-880c-4f09-8353-613637a9179c

📥 Commits

Reviewing files that changed from the base of the PR and between cec11d0 and c144409.

📒 Files selected for processing (4)

• server/src/__tests__/character-version-propagation.test.ts
• server/src/__tests__/combat-hp-events.test.ts
• server/src/services/CombatService.ts
• server/src/socket/combat/hpEvents.ts

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