fix: stabilize prototype backend and Unity smoke

[JOY (JOY)]

Summary

• Stabilize Nakama decision handling with shorter DOS.AI timeouts, context-cancel recovery, safe storage retries, and autonomous model backoff.
• Harden Unity Play Mode by serializing Nakama RPC transport, aborting active UnityWebRequests on shutdown, rebuilding incomplete HUD surfaces, and keeping quest tracker state refreshed.
• Add Unity 6.5 beta smoke fixes for Fusion CodeGen diagnostic paths, duplicate Xcode assembly references, local health tooling, Play Mode checklist, and agent dev-sync rules.
• Preserve merged alpha design work while moving AI NPC research docs to non-conflicting 33 and 34 design numbers.

Verification

• npm.cmd run build in backend/nakama
• npm.cmd test in backend/nakama
• git diff --check and git diff --cached --check
• PowerShell parser check for tools/windows/*.ps1 and tools/launch-local-second-client.ps1
• FunPlay MCP request_recompile + wait_for_compilation: no compile errors
• Unity Play Mode smoke for 90 seconds: no errors, only the known Visual Studio UDP messaging warning
• Local code-review fallback: approved with one follow-up suggestion to split player-chat/NPC autonomous Nakama RPC priority lanes if latency grows

Notes

• Commit was created with --no-gpg-sign because the local SSH signing agent refused the signing operation.
• Fusion CodeGen is vendored under this repo. The Unity 6.5 beta compatibility patch may need reapplying if the Fusion asset is upgraded.

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[chatgpt-codex-connector]

Return an allowed action for canceled decision RPC

rpcAgentDecide now returns a hardcoded fallback action: "stop" when context is canceled, but this bypasses the normal allowed-intent validation path. In player-chat turns, BuildDecisionRequest sends allowed = ["say"] (see PrototypeAgentBrain), so this response can be out-of-contract and causes the chat loop to treat the turn as handled and clear pending chat without a reply. Please derive the fallback action from request.allowed (or keep it as an error) so canceled requests cannot emit disallowed intents.

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[chatgpt-codex-connector]

Fix compile-error regex to detect Unity compiler failures

The compile-error pattern uses Assets\\.*\\.cs..., which regex-parses as Assets\.*\.cs and matches only repeated dots after Assets\, not real paths like Assets\Scripts\Foo.cs(...). As a result, check-local-health.ps1 can miss actual error CS... lines in Editor.log and incorrectly report Unity Compile as OK, reducing the reliability of the local smoke gate.

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[JOY (JOY)]

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