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Patrick Buckley
2c48f694db
* Add multi-model support with ModelRegistry, fallback routing, and per-workstream selection Introduces a ModelRegistry that holds named model configurations loaded from [models.*] sections in config.toml. Each workstream can select its model at creation time or switch mid-session via /model <alias>. When the primary model is unreachable, a configurable fallback chain tries alternative models. Sub-agents (plan/task) can optionally use a cheaper model via the agent_model setting. Core changes: - New turnstone/core/model_registry.py: ModelConfig (frozen, api_key redacted from repr), ModelRegistry (thread-safe lazy client creation, resolve, fallback chain), load_model_registry() with backwards-compatible config loading - session.py: registry/model_alias params, /model show+switch command, fallback in _create_stream_with_retry (extracted _try_stream), agent model override in _run_agent - workstream.py: factory signature accepts optional model_alias, create() gains model param - cli.py + server.py: build registry, updated session factories, banner, shutdown - protocol.py: model field on CreateWorkstreamMessage - bridge.py: pass model through workstream creation chain Frontend: - MODEL column added to dashboard tables in both server and console UIs - Responsive: hidden alongside NODE at narrow viewports - ARIA labels include model info, title attributes for truncated text - SSE connected event includes model_alias Documentation: - README: architecture tree, Multi-Model Support section, config keys - docs/architecture.md: module map, Multi-Model Registry subsection - docs/api-reference.md: model field in workstream creation, model_alias in SSE - PlantUML diagrams 02 + 03 updated with ModelRegistry Tests: 43 new tests (576 total), mypy clean, ruff clean. * Fix Copilot PR #9 review: model_alias property, preserve manual tool_truncation - Expose model_alias as a public @property on ChatSession instead of accessing the private _model_alias from server.py and tests - Track _manual_tool_truncation flag so /model switch only recomputes tool_truncation when it was auto-derived, preserving --tool-truncation overrides - Update PlantUML diagram to reflect the public property