Fix Desktop compression session lineage

[joshuadow]

Summary

• persist explicit compression-continuation metadata and expose full lineage ids for Desktop pin resolution

• project compressed conversations through the selected live tip while preserving workspace cwd fallback so new compacted sessions do not fall into "No workspace"

• recover Desktop prompt submits once when a stale runtime session id returns 4001 session not found

• add JSON-RPC/WebSocket diagnostics that avoid request params/payload/result/error bodies

• surface the Desktop recovery overlay after repeated post-boot gateway reconnect failures so transport drops do not require a full restart

Validation

• npm run test:ui --workspace=apps/desktop -- --run src/app/gateway/hooks/use-gateway-boot.test.tsx src/hermes-gateway-client-diagnostics.test.ts — 2 files passed, 7 tests passed
• python -m pytest tests/test_hermes_state.py -q — 270 passed
• python -m pytest tests/tui_gateway/test_protocol.py -q — 59 passed, 8 warnings from discord audioop deprecation
• python -m pytest tests/tui_gateway/test_ws_diagnostics.py -q — 5 passed
• npm --workspace apps/desktop run type-check
• npm --workspace apps/desktop run test:ui -- src/store/session.test.ts src/app/session/hooks/use-prompt-actions.test.tsx src/hermes-gateway-client-diagnostics.test.ts — 31 passed
• npm --workspace apps/desktop exec eslint -- src/app/session/hooks/use-prompt-actions.test.tsx src/hermes-gateway-client-diagnostics.test.ts src/app/session/hooks/use-prompt-actions.ts src/store/session.ts src/store/session.test.ts src/app/chat/index.tsx src/app/chat/sidebar/index.tsx src/app/desktop-controller.tsx src/types/hermes.ts

Notes

• Full Desktop lint still has pre-existing unrelated errors in other files; changed Desktop files lint clean with the targeted eslint command above.

[tonydwb]

Code Review Summary

Verdict: Approved

Well-scoped fix for desktop compression session lineage. Adds explicit lineage tracking in agent/conversation_compression.py, ensures store/session.ts preserves the correct session ancestry path through desktop reconnections, and updates JSON-RPC gateway diagnostics to reflect resolved lineage rather than ambiguous state. Test coverage is adequate (session store + gateway protocol + ws diagnostics) and changelog is clean.

Looks Good

• Lineage resolution is applied before any state mutation, preventing leak drift.
• TUI gateway now reports resolved_session_id via diagnostics endpoint.

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Reviewed by Hermes Agent

[teknium1]

Thanks for the broad lineage and recovery investigation. Current main already contains the core stale-runtime recovery and compression-tip resume behavior, but two pieces still warrant selective salvage.

Problems

• The prompt-submit recovery overlaps the current refactored implementation in apps/desktop/src/app/session/hooks/use-prompt-actions/submit.ts:337-371; applying the old use-prompt-actions.ts change would duplicate a now-more-complete path.
• Reconnect escalation is already present in apps/desktop/src/app/gateway/hooks/use-gateway-boot.ts:185-191, and resume now follows compression tips in tui_gateway/server.py:5603-5621.

Suggested changes

• Retain and port cwd inheritance for the rotation fallback: current child creation at agent/conversation_compression.py:803-809 still has no cwd, matching the linked Desktop/TUI compressed sessions can move into No workspace because continuation cwd is null #42228/fix: preserve desktop workspace cwd across continuations #49860 workspace case.
• Port the safe WebSocket diagnostics independently: current malformed-frame logging still includes payload=%r at tui_gateway/ws.py:359-365.

Automated hermes-sweeper review.