feat: add Python 3.14 support

[Copilot]

Summary

Adds Python 3.14 to the supported/runtime-tested versions for Plugboard and aligns dependency floors with the first releases that advertise 3.14 compatibility. CI and release workflows are updated so packaging and validation run against the expanded version set.

Changes

• Project metadata

  • Adds the Python 3.14 Trove classifier.
  • Keeps the existing requires-python >=3.12,<4.0 range and updates dependency floors needed for 3.14:
    • msgspec[yaml] >= 0.20
    • Ray optional/test dependencies moved to ray[tune] >= 2.55.0

• CI / release pipelines

  • Extends the main lint/test/build matrix to include Python 3.14.
  • Moves single-version workflows that build/publish artifacts to Python 3.14:
    • docs
    • docker
    • PyPI publish
  • Updates benchmarks to run on 3.14 so perf coverage tracks the newest supported interpreter.

• Lockfile refresh

  • Regenerates uv.lock for the new dependency constraints and trims packages that were only pulled in by ray[default].

• Test harness compatibility

  • Replaces the removed asyncio.events.BaseDefaultEventLoopPolicy annotation in tests/conftest.py with a Python-3.14-safe event loop policy fixture.

classifiers = [
  "Programming Language :: Python :: 3.12",
  "Programming Language :: Python :: 3.13",
  "Programming Language :: Python :: 3.14",
]

dependencies = [
  "msgspec[yaml]>=0.20,<1",
]

[project.optional-dependencies]
ray = ["ray[tune]>=2.55.0,<3", "jsonschema<4.25.0", "optuna>=3.0,<5"]

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• metadata.google.internal
  • Triggering command: /home/REDACTED/work/plugboard/plugboard/.venv/bin/python3 /home/REDACTED/work/plugboard/plugboard/.venv/bin/python3 /home/REDACTED/work/plugboard/plugboard/.venv/lib/python3.13/site-packages/ray/dashboard/dashboard.py --host=127.0.0.1 --port=8265 --port-retries=50 --temp-dir=/tmp/ray --log-dir=/tmp/ray/session_2026-04-15_20-56-11_830656_4404/logs --session-dir=/tmp/ray/session_2026-04-15_20-56-11_830656_4404 --logging-rotate-bytes=536870912 --logging-rotate-backup-count=5 --gcs-address=127.0.0.1:38795 --cluster-id-hex=ce80c26ace7135585b1558b765c616ab2285eede18133e1957c50d3a --node-ip-address=127.0.0.1 --proxy-server-url= --stdout-filepath=/tmp/ray/session_2026-04-15_20-56-11_830656_4404/logs/dashboard.out --stderr-filepath=/tmp/ray/session_2026-04-15_20-56-11_830656_4404/logs/dashboard.err ame (dns block)
• releases.astral.sh
  • Triggering command: /home/REDACTED/.local/bin/uv uv venv .venv --python python3.13 (dns block)
  • Triggering command: /home/REDACTED/.local/bin/uv uv venv .venv --python 3.14 urces/working_diOUTPUT --local python3 3 python /home/rmktemp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)