[Repo Assist] test: add SideEffects module to TaskSeq.Using.Tests.fs

[github-actions]

🤖 This is an automated pull request from Repo Assist, an AI assistant.

Summary

Adds a SideEffects module to TaskSeq.Using.Tests.fs with 7 new tests that verify Dispose/DisposeAsync call-count semantics for the use and use! CE bindings.

The existing tests (6 tests) only check that the disposed flag is set after a single iteration. The new tests cover:

Test	What it verifies
use — Dispose called exactly once per full iteration	Single iteration → single dispose
use — Dispose called on each re-iteration	3× iterations → 3× disposes
use! — DisposeAsync called exactly once per full iteration	Same as above for async path
use! — DisposeAsync called on each re-iteration	Same counting for async path
use — Dispose called on early termination via take	Abandoned enumerator is still disposed
use — multiple use bindings each get their own Dispose	Two resources → two disposes per iteration
use — each re-iteration creates and disposes a fresh resource	CE body re-runs on each GetAsyncEnumerator call

Two small helper types are added at module level:

• CountingDisposable — increments an int ref in Dispose
• CountingAsyncDisposable — increments an int ref in DisposeAsync

These make exact call-count assertions straightforward without the bool ref pattern used by the existing tests.

Test Status

✅ All 5258 tests pass (Release, net10.0).

Generated by 🌈 Repo Assist, see workflow run. Learn more.

To install this agentic workflow, run

gh aw add githubnext/agentics/workflows/repo-assist.md@96b9d4c39aa22359c0b38265927eadb31dcf4e2a