fix(v21): classify bilingual Product Layered CI paths

[laiqian0239-glitch]

Implements the exact prerequisite repair authorized by #388. First implementation commit 96ff1740a8e24c68b152f6315d9ab72b5796f9c1 is tests-only and must reproduce the seven Product integration paths as CI_UNKNOWN_PATH before governance/layered-ci/risk-policy.json is changed.

Authorized implementation scope is exactly:

• tests/layered-ci/governance-policy.test.js
• governance/layered-ci/risk-policy.json

No broad integration/ prefix, workflow change, Product runtime change, dependency change, gate weakening, or new infrastructure is permitted.

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📥 Commits

Reviewing files that changed from the base of the PR and between dea8a3c and c893db4.

📒 Files selected for processing (2)

• governance/layered-ci/risk-policy.json
• tests/layered-ci/governance-policy.test.js

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[laiqian0239-glitch]

Independent exact-head governance/code review for c893db4b93368c5a81aa7247fb112e6f0ee1c5e1 completed under the repository's CodeRabbit-quota fallback rule (the requested CodeRabbit full review did not start because of rate limiting). Verified: effective diff is exactly the two #388-authorized implementation paths; failure-first commit 96ff1740a8e24c68b152f6315d9ab72b5796f9c1 is a one-file tests-only child of authorization merge dea8a3c919b7af42fc711e47cc02e99af4d5058a; GREEN commit is its direct child and changes only governance/layered-ci/risk-policy.json; exactly seven Product integration paths are added to l2ExactPaths; test coverage requires each path to pass as L2 with EXACT reason; no integration//integration/element-module/ broad prefix, existing-prefix mutation, classification removal, workflow/runtime/dependency/manifest/lock change, unknown-path fail-open change, L3 automatic promotion, test weakening, skip mechanism, temporary bypass, or new Yance infrastructure is present. Review threads are empty. P0/P1 blocking findings: 0. Merge remains gated on all required exact-head CI and a fresh-main check immediately before merge.