fix(deps): cap python version to 3.12 since 3.13 is untested in CI

[pavsoss]

Closes #599

This PR addresses the metadata over-promising support for Python 3.13/3.14 when the CI matrix only tests 3.12.

• Updated pyproject.toml: Capped requires-python to ">=3.12,<3.13" to accurately reflect our tested matrix and prevent users from discovering edge cases on modern Python versions the hard way.
• Updated docs/developer_setup.md: Made it explicit to contributors that they should use exactly Python 3.12 for local validation since newer versions are not yet verified in CI.

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Reviewing files that changed from the base of the PR and between a492da5 and ea3618f.

📒 Files selected for processing (2)

• docs/developer_setup.md
• pyproject.toml

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🧪 PR Test Results

Check	Result
Tests (pytest tests/)	✅ success
Lint (ruff check .)	❌ failure
Coverage (agentwatch)	74.19%

_{Python 3.12 · commit ea3618f}