[jodal]

🤖 Summary

Stacked on #271.

Python 3.10 is end-of-life. This PR removes support for it.

• Set requires-python = ">=3.11" and pyright pythonVersion = "3.11".
• Remove the ruff target-version. Ruff takes the target version from requires-python.
• Remove the 3.10 tox env and CI job.
• Change "Python 3.10 or newer" to 3.11 in README.md, docs/index.md, AGENTS.md, and the requires-python headers of the examples.

With Python 3.11 as the target, ruff finds these upgrades:

• Actor.start() returns ActorRef[Self], and Actor.actor_ref is typed ActorRef[Self]. These replace the private A TypeVar, and the PYI019 ignore is removed. The inferred types for subclasses are the same.
• The test-only LogLevel enum is a StrEnum. The tests do not call str() on it, so the StrEnum string behavior has no effect.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.00%. Comparing base (ead139d) to head (03542a6).

Additional details and impacted files

@@               Coverage Diff               @@
##           python-3.15     #272      +/-   ##
===============================================
- Coverage        94.01%   94.00%   -0.02%     
===============================================
  Files               14       14              
  Lines              585      584       -1     
  Branches            51       51              
===============================================
- Hits               550      549       -1     
  Misses              31       31              
  Partials             4        4              

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