[fallintoplace]

Fixes #5653.

Description

What: Keep conditional waits stable when the system clock changes.

Why: Wall-clock adjustments can make a finite FL wait time out early or run too long.

Implementation: Measure the timeout using time.monotonic(). Add deterministic tests for backward and forward clock steps.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.

Testing

• Isolated behavioral reproductions passed (4 checks across the three fixes).
• Full repository ./runtest.sh -s and pytest were unavailable without a checkout and style dependencies. Added focused regression tests for CI.

Risk

Low. Only the clock used for elapsed timeout calculation changes; event, abort and callback ordering stays unchanged.

[greptile-apps]

Confidence Score: 5/5

[High impact] This PR appears safe to merge.

Summary

Changes conditional_wait to measure elapsed time with time.monotonic(), so wall-clock changes cannot shorten or extend finite waits.

• Finite waits keep their deadlines steady when the system clock changes.

_{Reviews (1) · Last reviewed commit: "Use monotonic time for conditional wait ..." · Reviewed by Greptile}