v0.5.25

• Harden frontend HTTP contracts by validating operator policy save responses and normalizing malformed JSON responses as stable gateway errors.
• Propagate abort signals through the frontend controller and port boundaries for client mutations, preventing obsolete requests and bootstraps from overwriting current state.
• Add deterministic runtime and Playwright coverage for autosave recovery, physical mutation cancellation and late stale responses.
• Document the frontend concurrency and contract-testing boundaries.