Ordered terminal transport and bounded parser recovery

What's Changed

• Fixed layout acknowledgement retry storms while preserving newer local edits and server revisions.
• Preserved per-session WebSocket FIFO across focus changes and replay barriers, with bounded fairness in the final writer.
• Isolated session input and recovery work in bounded lanes so slow replay or IPC does not hold up unrelated terminal input.
• Tracked outstanding xterm parser bytes across drains and reconnects; automatically replace a stalled parser and replay retained output without false acknowledgements.
• Added regression coverage for delayed ACKs, writer ordering, overload and shutdown, recovery coalescing, parser budgets and retired callbacks; verified real-browser load, background resume, reconnect and frontend reload.

Release integrity

Native archives have matching platform-specific SPDX SBOM assets plus GitHub build-provenance and SBOM attestations. Installers and the built-in updater additionally verify a signed manifest and all packaged-file hashes.

Verification guide · Security policy