fix(js): honor optional dependency overrides

[rowkav09]

Closes #589.

Honor npm's documented optionalDependencies precedence over duplicate dependencies entries. Remove stale required runtime row/constraint while retaining effective optional dependency and unrelated required entries.

Fail-first regression, then all470 JS adapter tests+lint green.

[rowkav09]

APPROVE at e14d230

When a name is in both dependencies and optionalDependencies, the runtime row is now dropped and only the optional one (with its constraint) is emitted. That matches npm, where optionalDependencies override dependencies of the same name. devDependencies and peerDependencies keep their own rows, as before. A non-object optionalDependencies value is ignored safely. The new test checks the shared name comes out once as optional "2" and the other runtime dependency is untouched. JS/TS adapter suite on the head merged with main: 470/470.

CI: not checked by me; the lane merges on APPROVE plus green CI.

Reviewed as rowkav09, the same account as the author, so this is not an independent GitHub approval.

[rowkav09]

Re-ack at 02868d0: APPROVE.

The only change since e14d230 is extracting the optional-name set into optionalDependencyNames(). The behaviour is the same: a dependencies entry whose name is also in optionalDependencies is skipped, dev and peer rows are unchanged, and a non-object optionalDependencies gives an empty set. JS/TS adapter suite on the head merged with main passes. Reviewed as rowkav09, the same account as the author, so this is not an independent GitHub approval.