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 releases needed for working 3.14 compatibility across the project and Ray-backed tests. 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
    • pydantic >= 2.13.1
    • 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].

• Python 3.14 Ray compatibility

  • Fixes the Python 3.14 Ray test failures caused by ray 2.55.0 resolving against an older pydantic.v1 compatibility layer.
  • Bumps the workspace Pydantic floor in both plugboard and plugboard-schemas so Ray state/dashboard imports and ray.init() work correctly on Python 3.14.

• 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",
  "pydantic>=2.13.1,<3",
]

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

Warning

Ray 2.55.0 Python 3.14 support depends on resolving to a new enough pydantic.v1 compatibility layer. This PR raises the Pydantic floor accordingly to avoid Ray startup and state API failures on Python 3.14.

[toby-coleman]

@copilot The tests fail in python 3.24 with Exception: The current node timed out during startup. This could happen because some of the raylet failed to startup or the GCS has become overloaded. Investigate what is going on and fix.

[Copilot]

@copilot The tests fail in python 3.24 with Exception: The current node timed out during startup. This could happen because some of the raylet failed to startup or the GCS has become overloaded. Inv...

Fixed in 8b172a5. The Python 3.14 Ray failure was coming from ray 2.55.0 resolving against pydantic 2.12.x, whose bundled pydantic.v1 layer breaks Ray’s dashboard/state imports on 3.14. I bumped the workspace Pydantic floor to >=2.13.1, refreshed uv.lock, and verified the failing benchmark collection path and Ray startup regression tests on 3.14.

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/python /home/REDACTED/work/plugboard/plugboard/.venv/bin/python /home/REDACTED/work/plugboard/plugboard/.venv/lib/python3.12/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_2026-04-19_20-33-08_235796_4079/logs --session-dir=/tmp/ray/session_2026-04-19_20-33-08_235796_4079 --logging-rotate-bytes=536870912 --logging-rotate-backup-count=5 --gcs-address=127.0.0.1:42175 --cluster-id-hex=f9aac9e7a83be44b0298f00b9b513725669466473475947863aeb198 --node-ip-address=127.0.0.1 --proxy-server-url= --stdout-filepath=/tmp/ray/session_2026-04-19_20-33-08_235796_4079/logs/dashboard.out --stderr-filepath=/tmp/ray/session_2026-04-19_20-33-08_235796_4079/logs/dashboard.err --minimal --modules-to-load=UsageStatsHead --disable-frontend (dns block)
  • Triggering command: /home/REDACTED/.cache/uv/builds-v0/.tmpH6TJ1C/bin/python /home/REDACTED/.cache/uv/builds-v0/.tmpH6TJ1C/bin/python /home/REDACTED/.cache/uv/archive-v0/uhE3K78bc6riUp1-x7QIF/lib/python3.14/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_2026-04-19_20-34-46_682489_4595/logs --session-dir=/tmp/ray/session_2026-04-19_20-34-46_682489_4595 --logging-rotate-bytes=536870912 --logging-rotate-backup-count=5 --gcs-address=127.0.0.1:43995 --cluster-id-hex=82a6117d8bbda9fa45f38eb3ccfc6aa93c34e42fd5a3287690c33bae --node-ip-address=127.0.0.1 --proxy-server-url= --stdout-filepath=/tmp/ray/session_2026-04-19_20-34-46_682489_4595/logs/dashboard.out --stderr-filepath=/tmp/ray/session_2026-04-19_20-34-46_682489_4595/logs/dashboard.err --minimal --modules-to-load=UsageStatsHead --disable-frontend (dns block)
  • Triggering command: /home/REDACTED/.cache/uv/builds-v0/.tmpE5sYCb/bin/python /home/REDACTED/.cache/uv/builds-v0/.tmpE5sYCb/bin/python /home/REDACTED/.cache/uv/archive-v0/_H9FmARY8DkvPuhofnm3w/lib/python3.14/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_2026-04-19_20-34-51_898061_4830/logs --session-dir=/tmp/ray/session_2026-04-19_20-34-51_898061_4830 --logging-rotate-bytes=536870912 --logging-rotate-backup-count=5 --gcs-address=127.0.0.1:43855 --cluster-id-hex=72507d85e9463ce8bcf92f35f7370e93664857b5904cd488b4d5f1dc --node-ip-address=127.0.0.1 --proxy-server-url= --stdout-filepath=/tmp/ray/session_2026-04-19_20-34-51_898061_4830/logs/dashboard.out --stderr-filepath=/tmp/ray/session_2026-04-19_20-34-51_898061_4830/logs/dashboard.err --minimal --modules-to-load=UsageStatsHead --disable-frontend (dns block)
• releases.astral.sh
  • Triggering command: /home/REDACTED/.local/bin/uv uv venv .venv --python 3.14 (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)

[github-actions]

Benchmark comparison for 2c24e5f0 (base) vs 3be4a9ec (PR)

---------------------------------------------------- benchmark: 1 tests ---------------------------------------------------
Name (time in ms)                   Min       Max      Mean  StdDev    Median     IQR  Outliers     OPS  Rounds  Iterations
---------------------------------------------------------------------------------------------------------------------------
test_benchmark_process_run     461.1901  481.0947  467.2095  7.9841  463.8573  7.2334       1;1  2.1404       5           1
---------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean

[github-actions]

Benchmark comparison for 2c24e5f0 (base) vs 75e5ade2 (PR)

---------------------------------------------------- benchmark: 1 tests ---------------------------------------------------
Name (time in ms)                   Min       Max      Mean  StdDev    Median     IQR  Outliers     OPS  Rounds  Iterations
---------------------------------------------------------------------------------------------------------------------------
test_benchmark_process_run     455.6769  462.8910  458.0362  3.0517  456.3163  4.1413       1;0  2.1832       5           1
---------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean

[github-actions]

Benchmark comparison for 2c24e5f0 (base) vs b445318a (PR)

---------------------------------------------------- benchmark: 1 tests ---------------------------------------------------
Name (time in ms)                   Min       Max      Mean  StdDev    Median     IQR  Outliers     OPS  Rounds  Iterations
---------------------------------------------------------------------------------------------------------------------------
test_benchmark_process_run     299.5808  304.4660  301.3083  1.9359  300.5949  2.4163       1;0  3.3189       5           1
---------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean