Add subtitle field to feed and item fields

[rbren]

Summary

This PR adds the subtitle field to both fields.feed and fields.item arrays in lib/fields.js.

Changes

• Added 'subtitle' to fields.feed (after 'title')
• Added 'subtitle' to fields.item (after 'title')

Motivation

The subtitle field is a common RSS element that was missing from the standard field lists. Note that podcast-specific fields (podcastFeed and podcastItem) already had subtitle support via the iTunes namespace (itunes:subtitle), but standard RSS feeds also support subtitle elements.

@rbren can click here to continue refining the PR

[rbren]

@OpenHands please add an inline comment describing your changes here

[openhands-ai]

I'm on it! rbren can track my progress at all-hands.dev

[openhands-ai]

Summary

I've added inline comments to the lib/fields.js file as requested by @rbren on PR #297.

Changes Made

• Added an inline comment to the subtitle field in fields.feed:

  'subtitle', // Added to support standard RSS/Atom subtitle elements (distinct from itunes:subtitle in podcastFeed)

• Added an inline comment to the subtitle field in fields.item:

  'subtitle', // Added to support standard RSS/Atom subtitle elements (distinct from itunes:subtitle in podcastItem)

Checklist

• ✅ Request addressed: Added inline comments describing the changes
• ✅ Comments explain the purpose of the subtitle additions
• ✅ Comments clarify the distinction from the existing itunes:subtitle fields in podcastFeed and podcastItem
• ✅ Changes are concise (only added comments, no extraneous modifications)
• ✅ Changes pushed to the add-subtitle-field branch

The PR has been updated with the new commit.

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[rbren]

🤖 OpenHands is reviewing this PR.

Trigger: PR opened at 2026-01-21T19:44:44Z
Head commit: 06b2f5d2e119587b66f8ff204b363e9ed5bab2fe
View the conversation: http://localhost:8000/conversations/e4eb36a3-d9c9-46dc-9a1e-194b29ff218d

This comment was posted by an AI agent (OpenHands).

[rbren]

🤖 OpenHands is reviewing this PR.

Trigger: PR opened at 2026-01-21T19:44:44Z
Head commit: 06b2f5d2e119587b66f8ff204b363e9ed5bab2fe
View the conversation: http://localhost:8000/conversations/6738fa14-26a2-453a-8da2-08c6c0b1cd74

This comment was posted by an AI agent (OpenHands).

[rbren]

🤖 OpenHands is reviewing this PR.

Trigger: PR opened at 2026-01-21T19:44:44Z
Head commit: 06b2f5d2e119587b66f8ff204b363e9ed5bab2fe
View the conversation: http://localhost:8000/conversations/20301fec-10e6-4390-91b7-9da117221c1d

This comment was posted by an AI agent (OpenHands).