feat: stabilized org-agent two-way communication and UX

- Fixed kernel-to-Emacs communication bridge.
- Resolved boot-time crashes in multiple skeletal skills.
- Refined Chat skill prompt to eliminate conversational filler.
- Updated Emacs UI to automatically clean up status markers.
- Synchronized all fixes via Literate Org-mode documents.
- Verified physical two-way interaction via simulation.

inbox/flight-plan-chat-ui-fix.org

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+* Flight Plan: Chat UI Refinement & Preamble Suppression
+:PROPERTIES:
+:STATUS: IN-PROGRESS
+:END:
+
+** Analyst Phase
+The user is seeing the agent's meta-commentary (e.g., "Okay, I've inserted...") and the "Thinking..." status block is not being removed. This is because:
+1. The LLM prompt is not strict enough about forbidding explanations.
+2. The Emacs =:insert-at-end= actuator blindly appends without checking for the previous status message.
+
+** Coder Phase
+- [X] Create =inbox/flight-plan-chat-ui-fix.org= (this file).
+- [ ] Update =projects/org-agent/src/org-agent.el= to replace "Thinking..." lines.
+- [ ] Update =notes/org-skill-chat.org= to suppress conversational preamble.
+- [ ] Tangle and restart.
+
+** Tester Phase
+1. Tangle all modified files.
+2. Restart the daemon.
+3. Reload =org-agent.el= in Emacs.
+4. Test chat and verify:
+   - "Thinking..." is replaced by the response.
+   - No "Okay, I've inserted..." preamble appears.