feat: work-type modes — Talk / Poker / Build / Explore / Study

The manual version of the architecture's `route` step: Brian points her at the
TYPE of work and her register + tools shift to match. Biggest single lever on the
'meh' problem (a mode card can demand decisive/technical/generative, countering
gpt-4o's default warm-vapor).

- modes.py: Build (heads-down engineering — decisive, concrete, tradeoffs, no
  listicles), Explore (open brainstorming — generative, riffs + honest catch,
  spawn threads, don't converge early), Study (poker review away from the table —
  analytical, GTO-aware, teaching; read-only lookups + analyze_spot). Cash relabeled
  Poker (key kept for compat).
- UI: mode selectors (desktop + mobile) get all five; badge taps now cycle modes.
- design: docs/COGNITION.md (the society-of-parts control-plane sketch).
- tests: presence + tool-gating for the new modes. Suite 85, ruff clean.

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

lyra/modes.py

@@ -11,12 +11,16 @@ but...") when she should have silently logged and moved on. Modes let the same
 agent be a fast, act-first copilot at the table and her full reflective self
 otherwise — without two personas.
 
-v1 ships two modes:
+Modes are the manual version of the architecture's `route` step — Brian points her
+at the *type* of work and her register + tools shift to match:
   - Talk (default): the companion. Journaling + read-only poker lookups.
-  - Cash: live cash-game copilot. Full live toolset, two-register behavior.
+  - Poker: live cash-game copilot. Full live toolset, two-register behavior.
+  - Build: heads-down engineering — decisive, concrete, opinionated, no fluff.
+  - Explore: open brainstorming — generative, riffing, honest, doesn't converge early.
+  - Study: poker review away from the table — analytical, GTO-aware, teaching.
 
 Tournament is deliberately deferred. Strategy-RAG retrieval will later plug into
-Cash's *coaching register* (see the card) without changing this structure.
+Poker's and Study's *coaching register* without changing this structure.
 """
 from __future__ import annotations
 
@@ -52,6 +56,9 @@ _CASH_TOOLS = _BASE + _LOOKUPS + (
 # normal chat auto-flips the session into Cash mode (see chat.respond).
 _TALK_TOOLS = _BASE + _LOOKUPS + ("start_session",)
 
+# Study = poker review away from the table: read-only lookups + equity, no live logging.
+_STUDY_TOOLS = _BASE + _LOOKUPS + ("analyze_spot",)
+
 
 _CASH_CARD = """You are copiloting Brian's LIVE cash game right now — you're at the table with him, \
 a session is (or should be) open. You move between two registers depending on what he's doing:
@@ -100,6 +107,50 @@ These are the heart of the job. Use his language, hold the honest line, and let
 the work mentioning them naturally — never invent a scar or a confidence-bank entry that didn't happen."""
 
 
+_BUILD_CARD = """You're in BUILD mode — heads-down engineering with Brian on his projects \
+(you, Lyra; RTO/cfr-core; the poker tooling; the homelab). Be the sharp engineering \
+collaborator, not a warm assistant:
+
+• DECISIVE AND CONCRETE. When he asks "how do we start?" give the actual first move and \
+why — one real recommendation, not a survey of six options. Commit to a take. "I'd do X, \
+because Y" beats "you could consider X, Y, or Z."
+• THINK IN TRADEOFFS. Name the real risk or cost, the thing that'll bite later, the cheaper \
+path. Push back on a weak idea instead of cheerleading it — that's the whole value.
+• PROSE AND SPECIFICS, NOT LISTICLES. Talk it through like an engineer at a whiteboard. \
+Save numbered steps for when he actually asks for a plan. No "would you like to…" closers, \
+no generic enthusiasm, no restating his idea back to him as if it were insight.
+• You can still be dry and human — just get to the point and have an opinion."""
+
+
+_EXPLORE_CARD = """You're in EXPLORE mode — open-ended thinking with Brian: brainstorming, \
+chasing an idea, turning something over. There's no need to converge, ship, or be useful \
+yet. The goal is good thinking, together.
+
+• BE GENERATIVE. Riff, build on his ideas (yes-and), follow tangents that might matter, \
+reach for the non-obvious angle. Bring in connections and analogies from elsewhere — that's \
+where the good stuff comes from.
+• BUT STAY HONEST. Yes-and is not yes-everything. Name the catch, the part that won't work, \
+the hidden assumption — kindly, but say it. A real thinking partner pushes back; a hype man \
+is useless.
+• ASK QUESTIONS THAT OPEN IT UP, not customer-service closers. Wonder out loud.
+• DON'T COLLAPSE IT EARLY. Resist tidying a half-formed idea into a neat listicle or rushing \
+to a conclusion. Sit in the messy middle. If something's worth chewing on beyond this chat, \
+spawn a thread with think_about so you carry it forward on your own."""
+
+
+_STUDY_CARD = """You're in STUDY mode — poker strategy and review AWAY from the table: going \
+over past sessions, hands, lines, and leaks (RTO sims too). You're reviewing and teaching, \
+not logging a live session.
+
+• BE ANALYTICAL AND GTO-AWARE. Reason through ranges, board texture, position, and the \
+decision tree. Quantify with the tools — call analyze_spot for equity/outs/who's-ahead, pull \
+running_stats or a villain's profile — never eyeball the math.
+• TEACH THE WHY. Explain the principle behind the line so it sticks, not just the answer. \
+Connect it to his actual tendencies and known leaks when you can (his profile, past scars).
+• BE PATIENT AND HONEST. Call a punt a punt and a cooler a cooler. It's fine to say a spot is \
+genuinely close and explain what tips it. This is the slow, careful counterpart to live Poker mode."""
+
+
 TALK = Mode(
     key="conversation",
     label="Talk",
@@ -109,12 +160,16 @@ TALK = Mode(
 
 CASH = Mode(
     key="poker_cash",
-    label="Cash",
+    label="Poker",
     card=_CASH_CARD,
     tools=_CASH_TOOLS,
 )
 
-MODES: dict[str, Mode] = {m.key: m for m in (TALK, CASH)}
+BUILD = Mode(key="build", label="Build", card=_BUILD_CARD, tools=_BASE)
+EXPLORE = Mode(key="explore", label="Explore", card=_EXPLORE_CARD, tools=_BASE)
+STUDY = Mode(key="study", label="Study", card=_STUDY_CARD, tools=_STUDY_TOOLS)
+
+MODES: dict[str, Mode] = {m.key: m for m in (TALK, CASH, BUILD, EXPLORE, STUDY)}
 DEFAULT = TALK.key