plan(v0.37): file REQ-325 — the stall classifier names the wrong cause

[avrabe]

Artifact only — no code change.

Found while watching the v0.36.0 release run, in the code REQ-317 shipped a
day earlier.

create-release sat queued behind its needs while the compliance build was
still running. classify_stall returned hosted-starved — because every
queued job carried ubuntu-latest, and the classifier reasons only about labels
and runner capacity.

The fleet at that moment:

online=12  busy=1
idle by label:  4x lean-mem   3x rust-cpu   2x rust-cpu,light
                1x light      1x rust-cpu,netns

Nothing was starved. The job was waiting its turn.

Why this is worth an artifact rather than a shrug

It's the same defect REQ-317 exists to fix, in its own fix: a diagnostic
confidently naming a cause it cannot observe.

And it's reachable, not theoretical. The probe fires on a run queued past thirty
minutes, and this release's builds legitimately take that long — so a slow
release would have auto-filed an issue blaming GitHub-hosted capacity for a
dependency wait, sending the next reader exactly where the old alert did.

My fixture set had no dependency-blocked case, which is why it passed. A
classifier that can only see labels and capacity will name capacity as the cause
of every wait it observes.

Proposed fix (not implemented here)

A queued job whose needs are incomplete is not a stall and must be excluded
before any capacity reasoning runs. The jobs API doesn't expose needs, so the
workflow definition has to be read. Add dependency-blocked as an explicit
outcome rather than folding it into capacity-available, so the distinction is
visible.

Scoped to v0.37.0 alongside REQ-323 and REQ-324.

[github-actions]

📐 Rivet artifact delta

Change	Count
Added	1
Removed	0
Modified	0
Downstream impacted (depth ≤ 5)	0

Graph

graph LR
  REQ_325["REQ-325"]:::added
  classDef added fill:#d4edda,stroke:#28a745,color:#155724
  classDef removed fill:#f8d7da,stroke:#dc3545,color:#721c24
  classDef modified fill:#fff3cd,stroke:#ffc107,color:#856404
  classDef overflow fill:#e2e3e5,stroke:#6c757d,color:#495057,stroke-dasharray: 3 3

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Added

• REQ-325

📎 Full HTML dashboard attached as workflow artifact rivet-delta-pr-896 — download from the workflow run.

_{Posted by rivet-delta workflow. The graph shows only changed artifacts; open the HTML dashboard (above) for full context.}

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Rivet Criterion Benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.20.

Benchmark suite	Current: 4178947	Previous: 16bff52	Ratio
traceability_matrix/1000	60573 ns/iter (± 523)	46077 ns/iter (± 202)	1.31
query/10000	331986 ns/iter (± 7225)	244880 ns/iter (± 1851)	1.36

This comment was automatically generated by workflow using github-action-benchmark.