fix[#1]: none of the feeds vaildate

[GabsEdits]

Closes #1

[Copilot]

Pull Request Overview

This PR addresses feed validation issues by updating both RSS and JSON feed formats.

• Removed the extraneous element from the RSS feed output.
• Removed the "updated" property from JSON feed tests and corrected the date formatting call.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test.ts	Adjusted tests to expect feeds without the element and without the "updated" property.
src/rss.ts	Removed the redundant element in the RSS feed generation.
src/json.ts	Fixed the date_published field to correctly invoke toUTCString(), ensuring proper timestamp.

Comments suppressed due to low confidence (1)

src/rss.ts:51

• Consider adding an inline comment explaining why the element has been removed to ensure future maintainers understand this change is intended to comply with feed validation standards.

    <author>${emailPart}(${escapedName})</author>\n

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Comments suppressed due to low confidence (1)

test.ts:211

• RssFeed.build() no longer emits a channel-level <author> element (removed in src/rss.ts), but the RSS snapshot comparison will still expect one because the expected template includes <author>…</author> inside <channel>. This will fail the snapshot test; update the expected RSS snapshot to match the new output (remove the <author> line) or revert the generator change if <author> must remain.

      </channel>
    </rss>
`.replace(/\n\s+/g, "\n").trim();

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