fix(polymarket): allow Gate elapsed-time rounding

[proerror77]

Change contract

Accept the fixed 900-second Gate when integer elapsed-time sampling reports 900 or 901 seconds; continue rejecting 899 and 902 seconds.

This is a small, already-specified bug fix, so a PRD is unnecessary.

Issue relationship

Refs #525

Out of scope

• Uploader or OSS retry behavior.
• Collector/reference business logic.
• Python overdue/HTTP 429 semantics.
• CI restructuring, dependency upgrades, research, snapshots, evaluator/MCTS, or Capture full-update Polymarket CLOB evidence for token microstructure research #235.

Dependency / merge order

None. Base is exact main d51453d83472781119ed67e70716faaad2c7a5f0. Merge this PR before rebuilding the production release artifact and rerunning the real-segment preflight/Gate.

Focused validation

• RED before policy change: gate policy rejected one second of elapsed-time rounding.
• GREEN: bash deployment/aliyun/test-polymarket-raw-ops-control-plane.sh.
• GREEN: bash -n deployment/aliyun/test-polymarket-raw-ops-control-plane.sh.
• GREEN: ShellCheck on the focused test.
• GREEN: git diff --check.
• Counterexamples: 899 and 902 remain rejected; 900 fixture and 901 rounding case pass.

Rollout / rollback impact

Rollout changes only the signed Gate policy and its focused contract test. A new exact-main artifact and real closed-segment preflight are required before a new Gate. The Gate remains fail-closed outside 900..901, and production remains Python until a fresh Gate, cutover, and 300-second smoke pass. Rollback is the existing automatic Python rollback.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The shadow-gate duration policy now accepts 900 and 901 seconds. Control-plane tests verify 901 seconds passes and 902 seconds remains rejected.

Changes

Shadow-gate duration validation

Layer / File(s)	Summary
Allow one-second duration rounding deployment/aliyun/polymarket-shadow-gate-policy.jq, deployment/aliyun/test-polymarket-raw-ops-control-plane.sh	The policy accepts 900–901 seconds, while tests accept 901 and reject 902 seconds.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related issues

• proerror77/monday#525: Directly addresses the same 900–901 second duration boundary and corresponding tests.
• proerror77/monday#486: Concerns Polymarket shadow-gate duration validation and boundary handling.

Possibly related PRs

• proerror77/monday#501: Refines the same 900-second duration policy to allow 901 seconds for elapsed-time rounding.
• proerror77/monday#487: Modifies the same shadow-gate duration policy and control-plane tests.
• proerror77/monday#44: Directly changes the same policy and duration validation tests.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly and concisely describes the elapsed-time rounding fix implemented in the policy and tests.
Description check	✅ Passed	The description covers the required change, issue, scope, dependencies, validation, rollout, rollback, and scope exception information.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/polymarket-gate-duration-rounding-525

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