feat: tool-registry pattern + example echo_tool#57
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Add src/tools/registry.py: a generic dispatcher mapping tool name -> (input
schema, callable). Each tool's input + output are StrictModel subclasses.
Three-method API matches the issue spec:
- register(name, input_schema) -> decorator
- dispatch(name, raw_input) -> validates raw dict against input schema,
invokes the tool, returns typed output
- names() -> sorted list of registered tool names
UnknownToolError (KeyError subclass) raises on dispatch with a missing
name; Pydantic's ValidationError propagates on bad input (wrong type or
unknown keys via StrictModel's extra="forbid").
Module-global `registry` singleton; `echo_tool` (input/output pair
EchoToolInput/EchoToolOutput) self-registers at module load to demonstrate
the pattern.
Layer hygiene: registry.py imports only from src/models/. Verified by
lint-imports — both contracts still kept.
7 unit tests cover: module-global resolves echo, happy-path dispatch,
unknown-tool error, bad input rejection, unknown-key rejection, duplicate
registration, and registry isolation.
Closes #20
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Closes #20. Generic Registry class with register()/dispatch()/names(); echo_tool exercises the layer; 7 unit tests; lint-imports keeps tools at the right layer.