test: fix all ruff lint errors in tests/test_observable/; remove from ruff exclude

[dbrattli]

… ruff exclude

• Fix E741: rename ambiguous variable names (l -> left/items/timers)
• Fix E721: use isinstance() instead of type() comparison
• Fix E501: wrap/noqa long assertion lines (marble test data)
• Fix UP032/UP031/UP004/UP035 etc. via auto-fix (f-strings, useless inheritance, deprecated imports, annotations)
• Remove tests/test_observable from ruff exclude list in pyproject.toml
• All 153 ruff errors resolved; ruff --check passes cleanly

[coveralls]

coverage: 93.516% (+0.004%) from 93.512% — repo-assist/pyright-ruff-cleanup-test-observable-scheduler-2026-04-21-6f569da2d139f64e into master

[github-actions]

Commit pushed: 2f7f369

Generated by Repo Assist

[github-actions]

🤖 This is an automated update from Repo Assist.

I've pushed a formatting fix to resolve the code-quality CI failure — ruff format wanted blank lines added before inline function definitions and one redundant blank line removed in test_transformation_fluent.py, test_filtering_fluent.py, and test_starmap.py.

The remaining lint failure is due to the [Repo Assist] title prefix not being recognised by the semantic PR title check (amannn/action-semantic-pull-request). The title test: fix all ruff lint errors... is valid conventional commits — the [Repo Assist] prefix just needs to be stripped before merge (or the lint action could be configured to allow the prefix). Happy for you to rename the title to test: fix all ruff lint errors in tests/test_observable/; remove from ruff exclude if that's easiest.

Note

🔒 Integrity filter blocked 47 items

The following items were blocked because they don't meet the GitHub integrity level.

• #749 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #748 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #742 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #736 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #711 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #700 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #698 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #634 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• using timeout with GroupedObservable leads to an index shift #225 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Sort hot observable between (slow) scan executions #237 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Observable interval appears to leak #259 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Example noteboks are out of date #265 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Proposal for a subscribe scheduler #309 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Convert async iterator to Obervable #422 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Weird interaction between group_by and to_iterable? #467 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Q: how to use scheduler with subject for concurrency? #528 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ... and 31 more items

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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