Both libraries had already moved `requires-python` to 3.14, but ruff, mypy and
pylint were still grading against 3.10 -- three tools judging an interpreter
nothing runs any more, and ruff withholding the pyupgrade fixes that only
become safe at the newer target. `pin_ci_python.py` rewrites these three knobs.
What the stale target was hiding: `datetime.timezone.utc` where `datetime.UTC`
is now correct (UP017), a dead `timezone` import left behind by it, and ruff's
stable formatter applying PEP 758 -- `except (A, B):` becomes `except A, B:`.
That last one makes the source 3.14-only at the syntax level, which is what
`requires-python = ">=3.14"` already promised; kuhy chose it deliberately over
holding ruff a release back (2026-08-29).
These two are libraries the apps install, so the floor matters more here than
anywhere else in the fleet -- every consumer already pins >=3.14.
Per project: ruff, ruff-format, mypy --strict and pylint clean, crdt-sync 432
tests and gatelock 389 tests, both at 100% line and branch coverage.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SfnJmxxsZ534AKk16rC2Gr
Extracted and generalized from diet_guard's existing tombstone-merge scheme
and GitHub Contents API client, extended with per-field HLC LWW so the same
library can also cover todo's mutable notes and wake_alarm's single-value
sync (Workstream D scoping decision, 2026-07-04). 100% branch coverage,
clean ruff/mypy/pylint/bandit.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017McuA1nAi6jBT1EaS5BrVf
