Charlie Marsh beeba1d2fc
Share model-visible tool specs across prompts ( #37807 ) ...
## Why
Building a prompt cloned every model-visible `ToolSpec`, even though the tool
set is immutable for the lifetime of its router.
## What changed
- Store model-visible tool specs as an `Arc<[ToolSpec]>` in `ToolRouter` and
`Prompt` so prompt construction only clones the shared pointer.
- Keep separately built routers on distinct shared slices so refreshed tool
sets remain independent.
## Testing
Extend router tests to verify allocation sharing within a router, allocation
separation across rebuilt routers, and the existing deferred-tool filtering.
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beeba1d2fc