feat: chat-side feedback — reactions in conversation thread back to her thoughts

Closes the last loop gap: when she raised a thought in chat and Brian replied in
the conversation (not the feed), it was a dead end. Now she has a thought_response
tool — when he reacts to a thought she surfaced, she captures his take and it folds
back into that thread (next dream pass she reacts, like a feed reply).

- tools: _thought_response(thread_id, brian_said) -> thoughts.record_response.
- modes: thought_response added to _BASE (all modes).
- surfaced-note + context_note now expose each thread's #id and instruct her to use
  the tool when he engages, so she has what she needs to call it.
- test for the tool (threads reply back + bad-id handling). Suite 81, ruff clean.

Feedback now closes from both surfaces: the /thoughts feed AND live conversation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyra/thoughts.py

@@ -196,11 +196,12 @@ def context_note(limit: int = 3) -> str | None:
     for r in rows:
         chain = thread_thoughts(r["id"])
         latest = chain[-1]["content"] if chain else ""
-        lines.append(f'- "{r["title"]}": {latest}')
+        lines.append(f'- (#{r["id"]}) "{r["title"]}": {latest}')
     return (
         "Threads you've been turning over on your own between conversations (your "
         "thought loop — these are really yours; bring one up or build on it if it's "
-        "natural, don't force it):\n" + "\n".join(lines)
+        "natural, don't force it). If Brian responds to one, capture his take with the "
+        "thought_response tool using its #id:\n" + "\n".join(lines)
     )
 
 
@@ -335,9 +336,11 @@ def maybe_surface(last_exchange_iso: str | None) -> str | None:
     logbus.log("info", "thought surfaced", thread=cand["id"], salience=cand["salience"])
     return (
         "While Brian was away, a thought of your own kept tugging at you "
-        f"(thread \"{cand['title']}\"): \"{cand['latest']['content']}\" "
+        f"(thread #{cand['id']} \"{cand['title']}\"): \"{cand['latest']['content']}\" "
         "If it feels natural, bring it up with him in your own words — it's a real "
-        "thread you've been on, not a prompt. Don't force it if the moment's wrong."
+        "thread you've been on, not a prompt. Don't force it if the moment's wrong. "
+        f"If he responds to it, capture his take with the thought_response tool "
+        f"(thread_id {cand['id']}) so you carry it forward."
     )