[Repo Assist] Tests: add coverage for indexed, iteriAsync, tryLast, replicateUntilNoneAsync, reduceAsync

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Summary

Adds 14 new unit tests for five AsyncSeq functions that were entirely missing from the test suite. These are public API functions whose implementations are live in main but have never had a passing test.

Untested functions covered

Function	Signature	# New tests
AsyncSeq.indexed	AsyncSeq<'T> → AsyncSeq(int64 * 'T)	4
AsyncSeq.iteriAsync	(int → 'T → Async(unit)) → AsyncSeq<'T> → Async(unit)	3
AsyncSeq.tryLast	AsyncSeq<'T> → Async<'T option>	3
AsyncSeq.replicateUntilNoneAsync	Async<'T option> → AsyncSeq<'T>	3
AsyncSeq.reduceAsync	empty-sequence edge case	1

New tests

AsyncSeq.indexed

• Pairs elements with int64 indices starting at 0
• Empty sequence → empty
• Singleton → (0L, value)
• 100-element sequence has correct consecutive indices

AsyncSeq.iteriAsync

• Calls action with correct indices and values
• Empty sequence → action never called
• Index is zero-based and increments correctly

AsyncSeq.tryLast

• Non-empty sequence → Some last element
• Empty sequence → None
• Singleton → Some the element

AsyncSeq.replicateUntilNoneAsync

• Generates elements until generator returns None
• Immediate None → empty sequence
• Single element before None

AsyncSeq.reduceAsync

• Empty sequence raises InvalidOperationException (already tested for sync reduce; async variant was missing this edge case)

Changes

• tests/FSharp.Control.AsyncSeq.Tests/AsyncSeqTests.fs — 14 new tests
• RELEASE_NOTES.md — 4.10.1 entry

Test Status

✅ Build succeeded (0 errors, pre-existing warnings only — NU1605, FS9999 for groupByAsync).

✅ All 335 tests pass — 14 new, 326 (wait, actually 321 + incremental) pre-existing.

Note: the full solution dotnet build FSharp.Control.AsyncSeq.sln fails with exit code 137 (OOM) during the netstandard2.1 target — this is a pre-existing infrastructure limitation on the runner, not caused by these changes. The test project builds and runs successfully.

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