fix(commit): preserve author metadata in parseConventionalCommits

[piotrek-sblok]

Recreates #2874, which was closed unmerged ("closing for now to keep the PR list tidy") with the source branch deleted. Credit for the original fix goes to @anishesg; #2874 has since had people asking for the fix, and #2761 is still open, so I've re-opened it from a live branch and dealt with the test fallout.

The bug

parseConventionalCommits() in src/commit.ts drops the author field when transforming Commit objects into ConventionalCommit objects. Everything else on the include-commit-authors path is wired correctly — config parsing, the strategy passing includeCommitAuthors into changelog note generation, GitHub commit fetching populating Commit.author, and DefaultChangelogNotes appending author info when options.includeCommitAuthors && commit.author — but by the time notes are rendered, commit.author is undefined, so author attribution never appears in the changelog.

The fix

author: commit.author in the object literal in parseConventionalCommits(), alongside the other preserved fields (sha, message, files, pullRequest).

Tests

• test/commits.ts: a regression test asserting name/email/username survive parseConventionalCommits(). The existing coverage tests DefaultChangelogNotes in isolation with handcrafted commits that already carry author, so nothing exercised this path — which is why the bug slipped through. I confirmed the new test fails on main (expected undefined not to be undefined) and passes with the fix.
• test/manifest.ts: the processCommits plugin-hook sinon.assert.calledWith compares against full commit literals, so it needed author: undefined added to the two expected commits. This was not part of fix(commit): preserve author metadata in parseConventionalCommits #2874 and is why the full suite would have gone red without it.

Fixes #2761

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