feat: add daily CI workflow to test integrations against latest dependency versions

[wiliyam]

Summary

Closes #121

Adds .github/workflows/daily_latest_integrations.yml — a scheduled job that runs the integration test suite daily against the latest released versions of each supported integration package.

What it does

• Runs at 06:00 UTC daily (also manually triggerable via workflow_dispatch)
• Tests each integration in parallel with fail-fast: false
• Installs wireup editable + upgrades the integration package to latest before testing
• Same Python 3.13 + uv setup as existing CI

[maldoinc]

It's probably best to rework this to reuse the existing tox definitions instead of duplicating them into this yaml workflow.

[maldoinc]

dev is a dependency group here, not an extra.

[maldoinc]

The matrix doesn't install all the required dependencies. For example, the Django job upgrades only Django, but the current tox env also needs djangorestframework, django-ninja, and typing_extensions.

[wiliyam]

Thanks for the review @maldoinc — reworked in `3f9f78c` to address all three points:

1. Reuse tox definitions — matrix now references tox env names (e.g. `py313-flask3`, `py313-django6`). The workflow runs `tox -e --notest` to build the tox venv using the deps already defined in `tox.ini`, then runs `tox -e --skip-pkg-install` for the actual test command. No more test-path or dep-list duplication between the workflow and tox.
2. `dev` as dependency group — replaced `uv pip install -e ".[dev]"` with `make install` (which runs `uv sync --group dev`).
3. Full Django dep set — matrix `packages` for django now includes `Django djangorestframework django-ninja typing_extensions` so the "upgrade to latest" step covers the full set that `py313-django6` actually uses. Same for `fastmcp` which now upgrades `fastapi starlette httpx fastmcp` together.

The `packages` field still lists what we want upgraded to latest (which is the whole point of the daily job — pin-ignore upgrade). Happy to drop it entirely and always upgrade all installed deps if you'd prefer — let me know.

[maldoinc]

Looks good overall. The only thing missing is the typer integration but other than that happy to merge.