Remove unused `@types/js-yaml` devDependency

[pinecone-groundskeeper]

Problem

package.json lists "@types/js-yaml": "^4" as a devDependency, but there is no js-yaml runtime dependency anywhere in package.json, and no import of js-yaml anywhere in src/ or tests/. A repo-wide search confirms js-yaml only appears in package.json/package-lock.json as this dangling types package — it is never actually used:

$ grep -rn "js-yaml" package.json src tests
package.json:56:    "`@types/js-yaml`": "^4",

This is dead scaffolding left over from an earlier version of the project (similar in kind to the leftover turbo.json/library-publish scaffolding already cleaned up in issue #14) and adds unnecessary install weight and lockfile surface for no benefit.

Acceptance criteria

• @types/js-yaml is removed from package.json devDependencies.
• package-lock.json is regenerated (npm install) with the entry removed.
• npm run typecheck and npm run lint still pass (nothing in src//tests/ references js-yaml types).

Scope

Remove only the unused @types/js-yaml devDependency and regenerate the lockfile. Do not touch any other dependency, and do not add a real js-yaml runtime dependency — if a future need for YAML parsing arises, that is a separate, deliberate addition.

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