chore: move to python 3.14

[VioletCranberry]

Supersedes #53.

Why not just merge #53

#53 changes .python-version and the Dockerfile only. Merging it as-is splits the project three ways:

• Docker and local dev on 3.14
• CI and releases still on 3.13 — both workflows hardcode PYTHON_VERSION: "3.13"
• Published metadata claiming support only up to 3.13 — the classifier list stops there

It also received no verification at all: .python-version and Dockerfile sit outside the CI path filter, so every job skipped (see #97, which fixes that).

Change

All five moved together:

File	Change
.python-version	3.13 → 3.14
Dockerfile (both stages)	python:3.13-slim-bookworm → python:3.14-slim-bookworm
pyproject.toml	add Programming Language :: Python :: 3.14
ci.yaml	PYTHON_VERSION → 3.14
release.yaml	PYTHON_VERSION → 3.14

requires-python already allowed >=3.11, so no constraint changes.

Verification

On Python 3.14.6:

Check	Result
uv sync --frozen (exact CI command)	resolves cleanly
uv run pytest	3024 passed
uvx ruff@0.15.0 check src/ tests/	All checks passed
uvx ruff@0.15.0 format --check src/ tests/	248 files already formatted
uv build	sdist + wheel built
docker build	image builds on python:3.14-slim-bookworm
image smoke test	python 3.14.6; entrypoint reports cocosearch 0.1.48; cocosearch.mcp.server imports against the capped mcp 1.26.0

One thing to know

The suite surfaces 14 new DeprecationWarnings for asyncio.iscoroutinefunction, slated for removal in Python 3.16, at src/cocosearch/mcp/server.py:2001 and two test sites. Pre-existing debt that 3.14 makes visible rather than a regression — inspect.iscoroutinefunction is the drop-in replacement. Not blocking, worth a follow-up before 3.16.

Follow-up worth considering

CI tests exactly one interpreter, so moving the pin to 3.14 leaves 3.11–3.13 untested while requires-python and the classifiers claim them. That gap predates this PR and widens with it; a version matrix in unit-tests would close it properly.

Note on ordering

Touches .github/workflows/ci.yaml, as does #97. Different regions of the file, so they merge cleanly in either order — whichever lands second may want a trivial rebase.

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