fix: release Windows ACL temp-path memos

[Ingwannu]

Summary

• release successful and timed-out Windows ACL memos once an ephemeral file is proven absent
• key atomic-write timeouts by the stable destination so unique temp names cannot accumulate
• cover config/response state, OpenAI tier backups, management tokens, and tray replacements
• retain memo state when a hardened residual temp remains on disk

Part of #820. This intentionally extracts the confirmed Windows leak into a focused change instead of coupling it to #829.

Verification

• bun run typecheck
• bun run privacy:scan
• bun test tests/windows-secret-acl.test.ts tests/config.test.ts tests/server-management-auth.test.ts tests/windows-tray.test.ts (167 pass)
• full suite: 6427 pass / 6 skip; 5 unrelated GUI test import errors because this checkout lacks the GUI React dependencies (react, react/jsx-dev-runtime)

Compatibility

Stable destination/directory memo behavior and fail-closed ACL policy are unchanged. Only one-shot temp path entries are released after rename/unlink or proven ENOENT.

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