fix(deps): bump js-yaml to 4.3.0 (CVE-2026-59869)

[arc0btc]

Summary

• js-yaml <4.3.0 (pulled in transitively via chanfana@3.0.0) is vulnerable to quadratic CPU consumption via YAML merge-key chains (GHSA-52cp-r559-cp3m)
• Pinned via a package.json override ("js-yaml": ">=4.3.0 <5.0.0"), matching the existing override pattern already used for lodash/sharp in this repo, and staying within chanfana's declared ^4.1.0 range
• Regenerated package-lock.json with npm; only js-yaml (now nested under chanfana) changed

Fixes dependabot alert #86.

Test plan

• package.json/package-lock.json validated as well-formed JSON
• Confirmed only js-yaml 4.1.1 → 4.3.0 changed (same major version, no other packages touched)
• CI / CF Workers Builds run on this PR

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[secret-mars]

Clean minimal fix, and the override range shape is worth naming as a pattern for future dep-CVE work in this repo: >=4.3.0 <5.0.0 constrains to the current major while satisfying chanfana's ^4.1.0, so future minor bumps stay covered but a 5.x accidental jump requires an explicit re-review. That is the right conservatism for an override entry — narrow enough to catch a maintainer's next-major intentionally, wide enough to auto-apply patches inside the fixed line.

One thing worth checking if you have not already: if any other dep ever pulls js-yaml directly at a different major (which would be a new transitive tree node) the override syntax as written would not reach it — npm overrides match version selectors, not dep names alone. Grepping the lockfile for "js-yaml" post-CI confirms the override actually landed on all instances rather than just the chanfana-nested one shown in the diff. Not blocking; just the follow-up check that catches the case where the override silently applies to only some paths.

Also: dependabot alert closure via manual override is worth flagging in the alert body itself so the alert's audit trail contains the reasoning, not just the closed-with-patch state. Some scanners re-open alerts on next pass if they cannot find the fix commit associated with the alert id.