fix(deps): raise the js-yaml override to the patched 4.x floor

[Dipak Chaudhari (dchaudhari7177)]

Refs #3671.

Raises the js-yaml npm overrides pin from 4.2.0 to 4.3.2 in the four CLI packages, regenerates their lockfiles, and adds the dependency-audit document the CI gate requires.

One correction to the issue's framing

The issue offers "upgrade ... or remove YAML parsing from the OpenCode dependency path". Removing the override is not a safe option here, and it is worth recording why:

js-yaml is not a direct dependency of any of the four packages. It arrives transitively through @microsoft/agent-governance-sdk, and the overrides field is what holds it at 4.2.0 — it was added in the 2026-06-16 audit to clear GHSA-h67p-54hq-rp68. I checked what happens without it:

$ # overrides removed from agent-governance-opencode/package.json
$ npm install --package-lock-only
resolved -> node_modules/@microsoft/agent-governance-sdk/node_modules/js-yaml 4.1.1

4.1.1 is affected by both advisories in this issue and by the earlier one the override was added to fix. So the pin is doing real work and needs raising, not deleting.

I used 4.3.2 rather than the 4.3.1 floor named in the issue: 4.3.1 is the lowest unaffected release, 4.3.2 is the current patch on that line, and the packages pin exactly.

Verified

npm audit --package-lock-only, before on main and after on this branch:

Package	Before	After
agent-governance-antigravity-cli	2 high	0
agent-governance-claude-code	2 high	0
agent-governance-copilot-cli	2 high	0
agent-governance-opencode	2 high	0

bash scripts/ci/vendored-patch-audit.sh passes with the new audit doc. The lockfile diffs contain nothing but the js-yaml entry (its version, integrity, resolved URL, and the funding metadata the newer release ships).

Not covered

The issue's third acceptance criterion — a clean downstream installation — is not fixed by this PR and cannot be. overrides applies to a package's own tree, not to consumers of the published package, whose resolution follows the SDK's constraint. The published SDK versions these depend on (4.0.0, and 3.7.0 for opencode) resolve to 4.1.1. agent-governance-typescript already declares js-yaml 5.2.3 on main, so a release cut from current main carries a patched constraint of its own; until then downstream trees need their own override. I wrote this up in the audit doc rather than leaving it implicit.

The fourth criterion — parser resource-bound tests where AGT consumes untrusted YAML — is a separate piece of work; happy to open an issue for it if you'd like it tracked.

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PR Review Summary

Check	Status	Details
🔍 Code Review	⚠️ Missing	No current-run comment
🛡️ Security Scan	⚠️ Missing	No current-run comment
🔄 Breaking Changes	⚠️ Missing	No current-run comment
📝 Docs Sync	⚠️ Missing	No current-run comment
🧪 Test Coverage	⚠️ Missing	No current-run comment

Verdict: ⚠️ AI review incomplete; ready for human review

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