Assert the tool round-trip property instead of the signature repr

[erikgaas]

Companion to AnswerDotAI/toolslm#99, which makes mk_tool-rebuilt tools carry param descriptions as Annotated metadata. That changes the signature repr, breaking the byte-exact assertion here:

test_eq(str(inspect.signature(c.tools.fahrenheit)), '(celsius: float)')

Replaced with the guarantee it stood for, checked over the live HTTP round trip:

test_eq(list(inspect.signature(c.tools.fahrenheit).parameters), ['celsius'])
test_eq(get_schema(c.tools.fahrenheit, pname='inputSchema')['inputSchema'], srv.specs[0]['inputSchema'])

This makes the notebook's own claim ("comes back out the other with its signature, docs, and defaults intact") fully true — previously per-param descriptions were dropped. Needs the toolslm PR (the toolslm>=0.3.47 pin already covers it per the bump-after-release convention). nbdev-test --path nbs/00_core.ipynb green with that branch.

[jph00]

Thanks @erikgaas .

If you have a moment, it might be nice to clean up the now-extremely-giant sentence "Against the live server started above: the handshake carries the instructions across, the rebuilt tool re-derives the exact schema it was served from (descriptions included, carried as Annotated metadata on its signature), and the bound tool wears fahrenheit's real signature and docs, calling it round-trips, and a crashing tool surfaces as a Python exception carrying the server-side traceback:"! :O