hzhang a27f6bd067 feat(codex): plexum-host MCP exposure + real consume mirror ...

Three-part wiring so codex agents get full dynamic-tool consume
support:

1. mcp-host subcommand in the plugin binary (routes argv[1] to
   mcpbridge.Run). Reads PLEXUM_MCP_SOCKET / PLEXUM_MCP_AGENT_ID
   from env, baked into codex's `mcp add --env` registration.

2. EnsureCodexMCPRegistered registers a per-agent stable server
   name (plexum-host-<sanitised>) lazily on first turn. Stable
   per-agent socket path via StableSocketPath so codex's
   registration entry and the per-turn bridge listener agree.

3. Post-turn ParseRolloutToolCalls + EmitCodexToolCalls walks the
   matching rollout-*-<thread_id>.jsonl and emits canonical events
   for every function_call + function_call_output pair using
   codex's REAL call_X ids. dynamic.jsonl now has block_ids that
   match codex's session, so consume mirror has real targets.

4. MutateCodexSession rewrites those response_item entries on
   consume: function_call.arguments → "{}" (heavy), output → marker.
   E2E verified: codex resume sees "...(tool called)" instead of
   the original output.

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

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