Sync decisions contract for InferenceInfra #5208 (Eve format 4)

[AmanSwar]

Sync of the vendored decisions contract for InferenceInfra #5208: Eve (pplx-decider) moves to v1.2, which answers prompt_format_version 4.

• contracts/wally-decisions-public-v1.openapi.json: re-vendored from InferenceInfra ecd738b257. The prompt_format_version enums gain 4, and their descriptions change.
• src/account/decisions_contract.rs: regenerated. Only CONTRACT_SHA256 moves, because the reader takes the version as an integer with no enum check.
• versions.toml: the decisions_source_commit and decisions_contract_sha256 pins.

There's no behaviour change for Wally. It never pins prompt_format_version, and it already reads any integer.

Why now: InferenceInfra's consumer-impact check keeps #5208 red until this pin matches it. This PR merges first, then #5208. The monorepo has a sibling PR that does the same.

python3 contracts/sync_from_inferenceinfra.py --check passes. The cargo tests need the kit, so CI runs them.

---

Summary by cubic

Syncs the vendored InferenceInfra decisions contract so prompt_format_version 4 (Eve v1.2) is accepted.

• Re-vendors the OpenAPI contract from InferenceInfra ecd738b257, adding 4 to the request and response prompt_format_version enums and updating their descriptions.
• Regenerates src/account/decisions_contract.rs; only CONTRACT_SHA256 changes because the reader takes the version as an integer with no enum check.
• Updates the decisions_source_commit and decisions_contract_sha256 pins in versions.toml.

No behavior change for Wally: it never pins prompt_format_version and already reads any integer. This merge unblocks InferenceInfra #5208, so merge it first.

^{Written for commit 9ce1c27. Summary will update on new commits.}

Summary by CodeRabbit

• API Updates
  • The decisions API now accepts prompt format version 4 alongside versions 2 and 3.
  • Requests and responses document that models may support two prompt format versions during a wording transition.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 94db16cd-8d94-45f7-a756-82f14be8f387

📥 Commits

Reviewing files that changed from the base of the PR and between f609fd1 and 9ce1c27.

📒 Files selected for processing: 3

• contracts/wally-decisions-public-v1.openapi.json
• src/account/decisions_contract.rs
• versions.toml

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

📝 Walkthrough

The decisions contract now accepts prompt format version 4 and documents responses during a wording transition. The request and response schema hashes, Rust contract digest, and source pins were updated.

Changes: Decisions contract versioning

Layer / File(s)	Summary
Prompt version schema contracts/wally-decisions-public-v1.openapi.json	The request and response schemas now allow prompt format version 4 and describe serving two versions during a wording transition. The recorded schema hashes were updated.
Contract digest and source pins src/account/decisions_contract.rs, versions.toml	The Rust contract digest and the source commit and digest pins were updated.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 9ce1c

Wally’s request and response contracts now accept version 4, and the local digest pins agree. No concrete merge-blocking issue is established.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main change: syncing the decisions contract with InferenceInfra and adding Eve format 4 support.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (2 skipped: 2 unsupported.)

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