hzhang a63f477463 feat(gemini): plexum-host MCP exposure + real consume mirror ...

Same architecture as the codex sister change:

1. mcp-host subcommand routes argv[1] to mcpbridge.Run, reading
   PLEXUM_MCP_SOCKET / PLEXUM_MCP_AGENT_ID from gemini-cli's
   `gemini mcp add --env` env baking.

2. EnsureGeminiMCPRegistered handles per-agent stable registration
   under `-s user --trust` so gemini auto-approves the tool surface.

3. Post-turn ParseGeminiToolCalls + EmitGeminiToolCalls scans the
   chat JSONL at ~/.gemini/tmp/<ws>/chats/session-*.jsonl. Pairs
   gemini's nested `toolCalls[].id` with the matching
   `functionResponse.id` from later user lines.

4. MutateGeminiSession rewrites the chat JSONL: toolCalls[].args
   → {} (heavy), functionResponse.response.output → marker.

E2E verified: gemini call exec via plexum-host → dynamic.jsonl
records the call → dynamic-tool-clear consumes → gemini session
mirrored → resume gemini sees consumed marker not the original.

2026-06-01 20:14:13 +01:00

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