ci: extract Python jobs into path-filtered python.yml

[vlad-scherbich]

Description

node flake in python-only change: #202

Moves python, python 3.14, and python 3.15 into .github/workflows/python.yml. on.push.paths: scenarios/python*/** and this workflow file. Nightly cron is unchanged (0 0 * * *). No pull_request trigger — main is push+schedule only.

Leftover ci.yml drops those jobs and the changes/run_others filter. Its on.push.paths are scenarios/{ddprof,dotnet,ruby,node,full_host}*/** plus ci.yml, so a Python-only push does not start other languages. Nightly leftover still runs them. Editing ci.yml still starts leftover runtimes.

schema-validation and ruff move to always-on lint.yml (every push, no path filter).

test.yml is not in these path lists. A reusable-workflow edit does not start Python or leftover languages; treat it as shared (run all) — touch each runtime workflow file, or wait for nightly.

Testing

A scenarios/python*-only path list matches python.yml and misses leftover ci.yml paths.

Risks

Do not mark python.yml required. A path-filtered workflow that never starts stays pending.

test.yml edits do not start language jobs until nightly or an explicit workflow-file touch.

Additional Notes

None.

[Copilot]

🟡 Changes recommended

schema-validation/ruff were moved out of the nightly-scheduled workflow but the new lint.yml does not include a schedule trigger, reducing nightly coverage unless re-added.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR restructures GitHub Actions CI to avoid non-Python runtime flakes on Python-only pushes by splitting Python jobs into a dedicated, path-filtered workflow and narrowing the remaining monolithic workflow to non-Python scenario paths.

Changes:

• Added .github/workflows/python.yml to run Python scenarios on scenarios/python*/** pushes and nightly schedule.
• Updated .github/workflows/ci.yml to drop Python jobs and trigger only on non-Python scenario path pushes (still runs nightly).
• Introduced .github/workflows/lint.yml for always-on schema-validation and ruff checks on every push.

File summaries

File	Description
.github/workflows/python.yml	New path-filtered Python runtime workflow (push paths + nightly schedule).
.github/workflows/lint.yml	New always-on lint/schema validation workflow (push-only).
.github/workflows/ci.yml	Reduced “leftover” runtime workflow with path filters for non-Python scenarios and nightly schedule.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Lite

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