[codex] Preserve marketplace offer prices in policy fields

[MuncleUscles]

Summary

• make price_in / price_out observation prefer candidate marketplace offer prices over provider-family runtime metrics
• add a regression test proving two marketplace offers for the same provider/model rank by their own prices even when provider-family metrics disagree

Root cause

Σ_pol field observation read ctx.state.ema[provider|family].price_* before candidate.price_*. For marketplace sources such as AntSeed, that collapsed multiple seller offers for the same family into one provider-family price, so policies could not actually select the cheapest seller/provider.

Validation

• lua -e 'package.path = package.path .. ";./tests/unit/?.lua"; dofile("tests/unit/price_enrichment.lua")'
• lua tests/run_lua.lua (564 passed, 0 failed, 0 errors)

Summary by CodeRabbit

• Bug Fixes
  • Improved price handling so offer-specific prices are preserved when present, instead of being replaced by fallback values.
  • Updated candidate scoring behavior to better reflect marketplace offer pricing, helping the lowest-priced offer rank first when applicable.
• Tests
  • Added coverage for marketplace pricing and candidate ranking to verify price values remain intact during scoring.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f6eb8838-526d-41d8-b6ae-c2637ceb4031

📥 Commits

Reviewing files that changed from the base of the PR and between 3d49132 and ee22c9e.

📒 Files selected for processing (2)

• llm_policy/fields.lua
• tests/unit/price_enrichment.lua

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📝 Walkthrough

Walkthrough

price_in and price_out now prefer non-nil candidate values before falling back to EMA-based values. A new unit test checks that marketplace offer prices remain intact and determine candidate ordering during scoring.

Changes

Marketplace price precedence

Layer / File(s)	Summary
Price fallback and ranking validation llm_policy/fields.lua, tests/unit/price_enrichment.lua	price_in and price_out use explicit nil checks before EMA fallback, and a unit test verifies marketplace offer prices survive scoring and control rank order.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hop through prices, neat and clear,
No nils go missing from the rear.
My carrot math now stays in sight,
And marketplace hops rank just right.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: preserving marketplace offer prices in policy fields.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/offer-price-observation

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