v3.7.3 — Finish God-class split

Internal refactor — no user-facing behavior change. Completes splitting the Kodiqa God-class into focused modules.

Changed

• Five cohesive subsystems now live in their own modules, each holding a back-reference to the agent while Kodiqa keeps thin delegating wrappers (behavior and every call site unchanged):
  • session_store.py — conversation persistence (3.7.2)
  • context_builder.py — system-prompt assembly + git/shell/pinned context
  • ollama_manager.py — Ollama server lifecycle, update check, model pull/delete/discovery
  • model_registry.py — API model discovery, /models listing, alias/provider resolution
  • agent_team.py — background sub-agents and agent teams
• kodiqa.py shrank from ~6250 to ~5140 lines.

Tests

• Added test_managers.py (wrapper delegation + pure-method behavior) and retargeted the moved tests. 361 total; ruff + CI green.