ci: bound ordinary macOS shard process lifetimes

[lidge-jun]

Summary

• Move both ordinary macOS shards to the shared bounded batch runner. Preserve the full sorted 1/2 and 2/2 file sets, singleton families, one worker, 60-second per-test ceiling and existing 20-minute job limit.
• Dev run 35710172686 stopped emitting test output for roughly 17 minutes before timing out. The same full membership passed in the existing batched macOS control; this change applies that process boundary to the ordinary shards.
• Execute the actual workflow command in the shell harness and assert disjoint/full membership, singleton ownership, exact-path basename collisions and fail-red crash attribution. No test is removed or marked skipped.

Verification

• Independent Sol source and workflow/dependency security reviews: PASS. Permissions, secrets, triggers and action pins are unchanged.
• Local tests, typechecks, builds and probes: NOT RUN under the explicit user prohibition. Hosted results on this head are pending.
• The owner explicitly requested immediate dev admin integration of reviewed fixes without waiting for CI. Pending checks are not represented as passed.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4d41db3 and b23f077.

📒 Files selected for processing (7)

• .github/workflows/ci.yml
• devlog/_plan/260922_native_tray_release/040_release.md
• structure/ops/docs-and-release.md
• structure/overview.md
• tests/ci-workflows/ci-bun-crash-classifier.test.ts
• tests/ci-workflows/ci-workflows.test.ts
• tests/ci-workflows/macos-serial-lanes.test.ts

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