[hua7450]

Summary

Full Suite - Contrib (other-shard-1) keeps hitting its 60-minute timeout, on release runs and on PRs. This moves the contrib SSA YAML route from that shard to other-shard-3, the lightest Contrib shard. It doesn't add a runner or change any test.

Why shard 1 times out

Shard 1 runs three things one after another: the shared per-subdir contrib batch, the contrib SSA YAML files one file at a time, and the contrib Python tests. The SSA route had 3 files on Oct 27, all from #10400. #10483 added 3 owner's draw files on Oct 29 and #10484 added 6 PIA ratio lever files on Oct 30, so it now has 12:

Step in shard 1	Release run 40586701799 (Oct 27)	Release run 41123038987 (Oct 30)
Shared per-subdir batch	16.7 min	17.1 min
Contrib SSA, per-file (3 → 12 files)	7.0 min	27.1 min
Contrib Python tests	21.2 min	cut off after 15.7 min
Job	about 46 min	cancelled at 60 min

Each SSA file is its own subprocess and runs alone (POLICYENGINE_BATCH_WORKERS=1, --workers 1); the 12 files peaked at 4.1 to 12.2 GB on run 41123038987, so they can't run two at a time on a 16 GB runner.

The timeout cancelled shard 1 in 7 of the 14 release runs on Oct 30 (from 04:37 to 20:25 UTC), and at least 4 PR runs the same day (for example 41067837131, 41069882211, 41075000562, 41091546450). Over the same PR runs, other-shard-3 took 6 to 11 minutes.

What changes

• Makefile: the SSA command moves, unchanged, from test-yaml-structural-other (shard 1) to the end of test-yaml-structural-other-shard-3, after refundable_credit_conversion. Both run per-file with one worker, so only one heavy subprocess is resident at a time. The shared batch still excludes ssa, so the files run once.
• test_make_test_matches_ci.py: the SSA route guard now looks for the route in shard 3. It also checks that shard 1 has no SSA invocation, and that CI runs shard 3's target.
• The workflows don't change: both matrices already map other-shard-3 to test-yaml-structural-other-shard-3, and make test still runs the route once.

Expected from Oct 30's timings: shard 1 drops by SSA's ~27 minutes, and shard 3 gains them; each should take roughly 35 to 40 minutes. Contrib's wall time is still set by its longest shard (states-shard-1, about 44 minutes on run 41123038987), so it shouldn't grow.

Checks

• make -n test-yaml-structural-other runs only the shared batch, with ssa excluded; make -n test-yaml-structural-other-shard-3 runs refundable_credit_conversion, then SSA per-file with POLICYENGINE_BATCH_WORKERS=1; make -n test contains the SSA route once.
• ruff format and ruff check pass on the changed test file.
• Not run locally: the guard tests and the Contrib shards. This PR's own Contrib run measures the new shard 1 and shard 3 times.

SSA keeps growing; at about 2.3 minutes per file, shard 3 has room for roughly 9 more files before it nears the timeout.

axiom: n/a: CI routing and workflow guard changes only.

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