feat: session modes (Talk/Cash) + live session HUD
Lyra now switches register based on what she's doing at the table instead of
being a wishy-washy companion mid-session.
Modes (lyra/modes.py):
- Talk (default companion) + Cash (live cash copilot); a mode = prompt card +
tool allow-list. Tool gating via tools.specs(allow=).
- Two-register Cash voice: act-first one-line logging when fed facts; full warm
companion voice for strategy / tilt / mental game.
- mode persisted per chat session (new sessions.mode column); auto-switch into
Cash when start_session fires; UI forces cloud backend in Cash (tools only
fire there).
Stack tracking + HUD:
- log_stack tool + poker_stack_log table; live net while sitting (stack - buy-in).
- poker.hud() bundle; /session HUD page (stack sparkline, hands, villains, notes,
stats) polling /session/data every 5s; Talk/Cash switcher + Session nav.
Endpoints: /session, /session/data, GET/POST /sessions/{id}/mode, /modes.
tests/test_modes.py (gating, mode roundtrip, stack/HUD); 36 tests green. v0.3.0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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