chore: fix typing exports, add operator docstring

[github-actions]

🤖 This is an automated PR from Repo Assist.

Summary

Three small but meaningful improvements discovered during a codebase review:

1. Fix reactivex.typing.__all__ — missing public exports

Action and StartableFactory are defined in reactivex/typing.py and used throughout the library (in Disposable, ScheduledObserver, operator signatures, NewThreadScheduler, EventLoopScheduler), but they were not listed in __all__. This means:

• Wildcard imports (from reactivex.typing import *) silently skip them
• Static analysis tools may not treat them as intentionally public
• Users who want to annotate callbacks matching these signatures cannot rely on them as a stable public export

This PR adds both to __all__, making the public API contract explicit.

2. Add missing docstring to on_error_resume_next operator

The inner function in reactivex/operators/_onerrorresumenext.py had no docstring at all — the only operator inner function in the codebase completely lacking one. Added a concise docstring consistent with the pattern used by other operators.

3. Resolve accidental merge-conflict markers in changes.md

The file changes.md in master contained raw merge-conflict markers (<<<<<<, =======, >>>>>>>), indicating a previous merge was not completed correctly. Both conflicting entries are valid changelog items — one about scheduler forwarding in pairwise/to_marbles/delay_with_mapper and one about PyPy CI skip for the tkinter scheduler test. This PR includes both.

Changes

• reactivex/typing.py: Add "Action" and "StartableFactory" to __all__
• reactivex/operators/_onerrorresumenext.py: Add docstring to inner on_error_resume_next()
• changes.md: Resolve conflict markers; both entries preserved; add entry for this PR

Testing

No logic changes — CI (uv run pytest, uv run pyright, uv run ruff check) should confirm no regressions.

Note

🔒 Integrity filter blocked 45 items

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

• 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".
• When using from_iterable with a generator the generator might not be closed #546 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Kivy scheduler is not in the library #560 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Exceptions get silently dropped when using from_iterable() #563 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• rx.timer works only with naive date object #574 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Adding Initial Value to Subject using start_with doesn't work for subscribe with AsyncIOScheduler #579 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• concat_map implementation or equivalent? #581 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Memory usage increases with subject and threadpool scheduler #582 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Connectable observable sends events multiple times #591 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ... and 29 more items

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

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[coveralls]

coverage: 93.512%. remained the same — repo-assist/improve-typing-exports-2026-04-18-60f123bfd9e95e24 into master