chore: release 2.7.1 (#102)

## Summary

Releases 2.7.1, carrying everything merged since 2.7.0:

- deprecation notes on `refresh` and on the `create_session` `address`
and `operator_token` arguments, which the API ignores (#101)
- `X-Quota-Reset` documented as a UTC date rather than a timestamp
(#100)
- docstring and README cleanup (#99)
- the uv prerelease rule matching python-commerce (#98) and a dependency
sweep, uv 0.12.23 (#97)

Worked with: Varun.

Out of scope: no runtime behavior changes; the deprecated options keep
working as before.

## Type of change

- [ ] Bug fix (no breaking change)
- [ ] New feature (no breaking change)
- [ ] Breaking change (existing callers must update)
- [x] Docs, tests, or internal maintenance only

## Public API

none. The deprecations are docstring notes only; signatures and wire
formats are unchanged.

## Test plan

`ruff check`, `ruff format --check`, `ty check` and `pytest` (177
passed, 2 skipped, 99.82% coverage) pass locally on this branch.

## Checklist

- [x] Tests cover the new behavior, and the suite passes locally
- [x] Lint, format, and type checks pass
- [x] Docs and README examples updated if the public surface changed
- [x] No secrets, credentials, or personal data in the diff or the tests

Author: vvillait88

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentscore-py"
-version = "2.7.0"
+version = "2.7.1"
 description = "Python client for the AgentScore APIs"
 readme = "README.md"
 license = "MIT"