feat: live chat deliberation — think privately before answering (less 'meh')

The chat had no thinking in it: respond() was a single gpt-4o call in default-
assistant voice (numbered lists, 'would you like to...', vague). All the cognition
work was background-only. This brings a thought step into the conversation.

- chat: before answering a substantive turn (trivial 'ok/lol' skipped), a private
  _deliberate() pass — "what do you ACTUALLY think, your real take, the substance,
  no pleasantries" — drawing on her in-context threads/journal. The thinking is then
  injected as the LAST system note with voice enforcement (answer from this; no
  numbered list / how-to outline unless asked; no 'would you like to' closer), so it
  beats gpt-4o's boilerplate at the most influential position. Logged to /logs.
- Wired into respond() + respond_stream(). Config CHAT_DELIBERATE (default on) to
  disable if the extra call's latency annoys.
- persona: "talk, don't outline" — prose over listicles, the first concrete move
  over a survey of options.
- test_chat.py (gating + note composition + disabled). Suite 84, ruff clean.

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

lyra/config.py

@@ -37,6 +37,7 @@ class Config:
     ping_cooldown_min: int  # min minutes between AUTO pushes (explicit reach-outs bypass it)
     ping_quiet_hours: str  # local "start-end" 24h window to stay silent, e.g. "1-9"
     digest_hour: int       # local hour (0-23) to send her daily "what I've been thinking" digest
+    chat_deliberate: bool  # think privately before answering substantive chat turns
     # External input feed (her #1: react to the world). Comma-separated RSS/Atom URLs.
     feeds: tuple[str, ...]
     feed_react_prob: float  # chance a would-be new thread reacts to a feed item instead
@@ -79,6 +80,7 @@ def load() -> Config:
         ping_cooldown_min=int(os.getenv("PING_COOLDOWN_MIN", "60")),
         ping_quiet_hours=os.getenv("PING_QUIET_HOURS", "1-9"),
         digest_hour=int(os.getenv("DIGEST_HOUR", "18")),
+        chat_deliberate=os.getenv("CHAT_DELIBERATE", "true").lower() not in ("0", "false", "no"),
         feeds=_csv("LYRA_FEEDS", "https://hnrss.org/frontpage,https://www.pokernews.com/rss.php"),
         feed_react_prob=float(os.getenv("FEED_REACT_PROB", "0.5")),
     )