Support Python 3.14

[caius72]

Summary

Raises the supported Python ceiling to include 3.14. Verified the full dependency set installs and the test suite passes on CPython 3.14.6 (989 passed, 12 skipped, 6 xfailed).

The blocker was jsonschema-rs 0.29.1 (pinned transitively via langgraph-cli 0.4.14 → langgraph-api 0.7.65), whose PyO3 0.23 bindings predate 3.14 and cannot build from source. Upgrading the langgraph stack (langgraph-cli 0.4.30, langgraph-api 0.10.0, langgraph 1.2.6) pulls jsonschema-rs 0.44.1, which ships abi3/cp314 wheels.

Changes

• pyproject.toml: requires-python <3.14 → <3.15; add 3.14 classifier
• .github/workflows/ci.yml: add 3.14 to the test matrix
• uv.lock: full re-resolve for the langgraph stack (large diff — the whole langgraph stack moved)
• docs/PI_EXTENSION.md: update stated version range
• src/skillspector/__init__.py: suppress a LangChainPendingDeprecationWarning emitted on import. langgraph deserializes with langchain's default allowed_objects, and langchain_core's import re-enables that warning via surface_langchain_deprecation_warnings(), so we import langchain_core first, then prepend our ignore filter so it wins.

Test plan

• uv sync --all-extras clean on a fresh 3.14.6 venv
• uv run pytest — 989 passed, 12 skipped, 6 xfailed
• uv run ruff check / ruff format --check clean
• skillspector --help / --version work; deprecation warning gone

Note: one pre-existing test (test_input_handler_ssrf.py::test_github_url_allowed) fails locally because it does a live DNS lookup; it fails identically on 3.12 in this environment and is unrelated to the version bump. CI should resolve github.com normally.

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