fix: align supported Python metadata

[njzjz]

Summary

• align the Python floor with the dependency graph
• cover every advertised interpreter consistently in CI
• synchronize conda runtime requirements with PyPI metadata
• make uv dependency resolution succeed across the supported range

Closes #617

Validation

• full unit suite: 163 passed, 42 skipped
• uv run --all-extras resolves successfully
• pre-commit and Ruff checks passed
• exact CI ty==0.0.17 check passed
• CLI smoke checks passed

Repository-wide Pyright retains unrelated baseline diagnostics.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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Configuration used: Organization UI

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Run ID: ee6a8bc8-0c6c-496c-a821-80c0c8868975

📥 Commits

Reviewing files that changed from the base of the PR and between 34ddb4b and 1c24969.

📒 Files selected for processing (4)

• .github/workflows/test.yml
• AGENTS.md
• conda/meta.yaml
• pyproject.toml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.40%. Comparing base (f547911) to head (1c24969).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #643      +/-   ##
==========================================
+ Coverage   48.38%   48.40%   +0.02%     
==========================================
  Files          40       40              
  Lines        3960     3960              
==========================================
+ Hits         1916     1917       +1     
+ Misses       2044     2043       -1     

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