[FanWu-ai]

callable + wait_strategy constructs the wait combination in reverse operand order. Stateful callbacks can consequently schedule a different delay from wait_combine(callable, strategy): the public retry-loop regressions record 2.1 seconds instead of the intended 1.2. It can also raise the right callback's exception before invoking the left callback.

Construct wait_combine(other, self) in the reflected callable branch. Integer zero/sum identity and nonzero-number rejection are unchanged. Add five tests for callback order, exception short-circuiting, sum compatibility and synchronous/asynchronous retry delays, plus documentation and a Reno note.

This is distinct from #724's operand validation and #749's large-sum recursion handling; neither corrects this reflected evaluation order.

Validation on Linux / Python 3.12.14:

• Fresh pristine full aggregate: 185 tests plus pinned Ruff, strict mypy, 35 doctests and warning-as-error HTML passed before edits.
• Unchanged-source replay produces five failures, including two failing subtests; controls pass. The corrected focused selection passes.
• Final clean-tree full aggregate: 190 tests plus all lint/type/docs gates pass. Independent automated review reran the aggregate and verified additional nested/stateful/callable-object cases.
• Reno lint, source/wheel builds, strict Twine and whitespace checks pass. Built contents match the tested commit, and isolated installed-wheel smoke tests record the expected delay through both retry controllers.

Other interpreters, operating systems and hosted checks are not claimed. Prepared and tested with OpenAI Codex assistance; no human review is claimed.