fix: shared-state trust-flip re-init, atomic storage writes, falsy RPC cache

[antfubot]

Summary

Implements plans 010, 012, and 025 from plans/:

• fix(client): createRpcSharedStateClientHost's trust-flip listener re-ran initSharedState() on every true emit, registering a duplicate updated → server-state:set/patch bridge each time. Guard init to run at most once per key.
• fix(storage): createStorage's debounced writer used an unguarded, non-atomic fs.writeFileSync. A crash mid-write could corrupt the file, and a write error (EACCES/ENOSPC) threw uncaught inside the debounce timer. Now writes to a pid-scoped temp file in the same directory and atomically renames it into place, with failures reported via a new DF0035 diagnostic instead of throwing.
• fix(rpc): the client RPC response cache used a truthiness check (if (cached)), so a legitimately cached 0/''/false/null read as a miss and was re-fetched on every call. Added RpcCacheManager.has() (presence check) and switched the client cache path to use it.

Each fix ships with a regression test proving the previously-buggy behavior is fixed. plans/README.md status rows for 010/012/025 are marked DONE, and the three now-executed plan files are removed.

Verification

• pnpm --filter devframe build — clean
• pnpm exec vitest run packages/devframe — 32 files / 308 tests pass
• pnpm --filter devframe typecheck — clean
• pnpm lint — clean

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