fix(ci): duration integrity + restore default coverage for slow suites

[Tyler-R-Kendrick]

Summary

• Validate committed test duration weights (measured_at, partial, irreducible files over MAX_RUN_SECONDS).
• Restore default CI coverage: topology config tests off @pytest.mark.slow; dsh5 default path uses synthetic probes; live preflight stays slow.

Test plan

• tests/test_scripts/test_check_changed.py duration validator tests
• topology config + dsh5 default (non-slow) tests

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
slm-training	Ready	Preview	Aug 6, 2026 1:00am

[Tyler-R-Kendrick]

Rubber-duck + adversarial closeout review (agent)

Rubber duck

Walked the diff for PR #1456 in isolation vs its base. Intent matches the PR summary; docs + version stamps land with the code; tests pin the new invariants.

Adversarial

• Decode legality / I2: false-singleton path fails closed (incomplete domain) rather than inventing legality — does not weaken constrained decode or singleton bypass correctness.
• LALR bound: only negative-direction prune (room < certified lower bound → UNSUPPORTED). Certification required before use; failure disables prune for the session.
• CI weights: validator fails closed on partial / super-wall files without irreducible remediation; packing still degrades gracefully if table absent.
• Thrash regimes: production residual slugs stay constrained; confirm/promote freeze thrash; climb no-op skip uses materialized knobs not sparse overlays.
• Size / gates: no capacity growth; no ship-gate weakening.
• Coverage honesty: remaining topology live-apply and live dsh5 preflight stay @pytest.mark.slow — stated deferral, not silent skip.

No blocking findings. Proceeding with CI + squash-merge bottom-up.