fix(polymarket): preserve exact manifest float round trips

[proerror77]

Change contract

Ensure hft-collector parses serialized floating-point manifest values through serde_json round-trip precision so exact producer-versus-bound-FD equality remains fail-closed without accepting an epsilon.

A PRD is unnecessary because issue #292 defines one dependency-feature behavior and one production-derived counterexample; implementation followed Matt TDD.

Acceptance evidence

• Red proof before the fix: parsing 0.9340463458110517 produced 0.9340463458110516, while 1048 / 1122 produced 0.9340463458110517.
• Green proof: the same focused test passes after enabling serde_json/float_roundtrip for hft-collector.
• Importer strict Value equality and the quality formula are unchanged; no epsilon is accepted.
• cargo test -p hft-collector: 211 passed, 2 ignored; all binary suites passed.
• cargo clippy -p hft-collector --all-targets --no-deps -- -D warnings: passed.
• Changed-file rustfmt and git diff --check: passed.
• Workspace/package fmt has unrelated pre-existing drift in polymarket-raw-ops.rs and polymarket_raw.rs; this PR does not absorb it.
• Matt code review: Standards PASS; Spec behavior PASS. Exact-main cloud proof remains the declared post-merge gate.

Out of scope

Approximate float equality; changing manifest schema or quality formula; unrelated formatting cleanup; collector deployment; data rewrapping; snapshot/evaluator logic.

Dependency / merge order

Depends only on merged #291 diagnostics. Merge this PR, publish one exact-main compiler image, then rerun the unchanged #270 triplet.

Focused validation

Production-derived 1-ULP counterexample, full hft-collector tests, strict Clippy, changed-file formatting, and two-axis code review.

Rollout / rollback impact

Dependency-feature-only parsing correction inside hft-collector. Rollback restores the false rejection; strict accepted-data semantics otherwise remain unchanged.

Closes #292

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 43f18da0-2324-4489-b598-8d2e9f9435ba

📥 Commits

Reviewing files that changed from the base of the PR and between 4201492 and 66ae828.

📒 Files selected for processing (2)

• rust_hft/tools/collector/Cargo.toml
• rust_hft/tools/collector/src/polymarket_research_import.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/polymarket-float-roundtrip-292

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