Phase 5B commit 4: delete style/shape/voice-matching/model-routing systems
Backend cleanup:
- Delete STYLE_SPEED_MODIFIERS, STYLE_PHONE_QUALITY constants
- Delete _normalize_style_key, _match_voices_to_styles,
get_style_speed_modifier, get_style_phone_quality functions
- Delete _pick_caller_style, _HEAVY_STYLES, _LIGHT_STYLES,
_EVASIVE_STYLES (only called by template path)
- Delete _is_informal_style + _INFORMAL_STYLES
- Remove orphaned calls to deleted _assign_call_shape
- Drop shape parameter from _pick_response_budget
- Simplify _assess_call_quality (no more shape/style/pool_name)
- Delete Session fields: caller_styles, caller_shapes,
caller_model_strategy/pool/map/fallback/models/_cycle_idx
- Remove those fields from Session.reset, checkpoint save/load,
and session.caller property
- Drop style/shape lookups in chat callsites and promotion gate
- Update config.py caller_dialog model stale comment
luke
9982f65742