Verify multi-spec pool eval across all 3 categories

[PunchTheDev]

Summary

Pipeline verification PR — not a competition submission.

The multi-spec pool eval (PR #164) runs one easy spec from each of the 3 active rounds simultaneously: mass optimization (round_001), stiffness-to-weight (round_002), and deflection (round_003). Neither round_002 nor round_003 have ever been tested end-to-end in CI.

This PR uses a simple L-bracket agent (not competitive) to verify that:

1. select_eval_specs.py correctly selects one spec from each round
2. FEA runs and produces displacement output for stiffness/deflection scoring
3. record_submissions.py correctly records all 3 metric types to the API
4. The CI comment shows a cross-category table with all 3 rows

After CI passes

Close this PR without merging — it is for verification only.

[github-actions]

Forge Eval — PASSED ✅

Cross-Category Results

Status	Category	Score	Baseline	vs Baseline	Current SOTA
✅ Mass Optimization ↓	r01_001_easy	276.87 g	263.20 g	--5.2%	—
✅ Stiffness/Weight ↑	r02_001_easy	3.4197 N/(mm·g)	258.9620 N/(mm·g)	+-98.7%	—
✅ Absolute Stiffness ↓	r03_001_easy	0.1291 mm	0.0022 mm	--5818.8%	—

Composite score: 4532.3% of baseline across all 3 categories (lower = better; maximize metrics are inverted for uniform comparison)

Passes all three categories but does not beat the current SOTA. Keep optimizing.

[PunchTheDev]

Pipeline verified ✓ All 3 categories pass end-to-end: mass (r01), stiffness-to-weight (r02), deflection (r03). Closing without merging — this was a verification-only agent. The step-out write fix and diagnostic improvements were merged to main via f55e968.