Fix: size the ring task window for host_build_graph PA Case1/Case2

[noabauma]

Both cases are whole-graph-resident and build more tasks than the 16384-task default window, so bind fails with -1000 before any kernel runs. Case1 orchestrates ~65,792 tasks and Case2 ~32,832; each case now requests the next power of two above its own count via CallConfig.runtime_env.ring_task_window.

Only the task window needs a knob -- the graph heap is committed to its measured size after orchestration and takes no configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Run ID: 4b885383-8305-4ec0-85f6-9aca3ccc4154

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Reviewing files that changed from the base of the PR and between 7bcdc95 and d9e1aa9.

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• tests/st/a2a3/host_build_graph/paged_attention/test_paged_attention.py

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📝 Walkthrough

Walkthrough

Two paged-attention host build graph test cases now set explicit runtime_env.ring_task_window values and document their resident task counts.

Changes

Paged attention task window configuration

Layer / File(s)	Summary
Configure resident task windows tests/st/a2a3/host_build_graph/paged_attention/test_paged_attention.py	Case1 sets ring_task_window to 131072. Case2 sets it to 65536. Comments document the resident task counts.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to d9e1a

The paged-attention host build graph cases now request sufficiently sized task windows, preventing pre-kernel bind failures for their resident task graphs. No current merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the change: sizing the ring task window for host_build_graph paged-attention Case1 and Case2.
Description check	✅ Passed	The description explains the task counts, the default-window failure, and the configured remediation. It directly matches the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Warning

Some tools did not complete. Review the errors below.

🔧 Ruff (0.16.3)

tests/st/a2a3/host_build_graph/paged_attention/test_paged_attention.py

�[1;31mruff failed�[0m
�[1mCause:�[0m Required version ==0.14.8 does not match the running version 0.16.3

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_{A rabbit tunes the task table bright
Ring windows fit the graphs just right
Case One holds tasks in a spacious span
Case Two follows with a smaller plan
The paged paths hop with care
And resident tasks find room there}

_{Comment @coderabbitai help to get the list of available commands.}