Remove Frame/Object Duration from moq-lite and moq-timestamp

[kixelated]

What

Removes the Duration field from a Frame in moq-lite and the DURATION object property from the moq-timestamp extension. Both drafts now carry a presentation timestamp only.

Why

Duration was an application-level presentation hint that the transport never used for any delivery decision. Worse, it encourages a frame of added latency: to know a frame's duration you either have to know its length before its successor exists (impossible for live media) or wait for the next frame to infer it. A bare timestamp lets a receiver present each frame as soon as it arrives.

Changes

moq-lite (draft-lcurley-moq-lite.md):

• Dropped Duration from the Frame concept section.
• Removed Duration Delta from the FRAME message layout and semantics.
• Removed Duration from the datagram body.
• Updated the Publisher Timescale omission rule to mention only the timestamp field.
• Folded the duration mentions out of the moq-lite-05 changelog entries.

moq-timestamp (draft-lcurley-moq-timestamp.md):

• Removed the DURATION Object Property section in full, including the relay age-refinement rationale.
• Updated the abstract/introduction to describe two Key-Value-Pairs (Timescale + Timestamp).
• Removed the 0x915C4 DURATION IANA registration. The codepoint was never published, so freeing it is safe.

Reviewer notes

Both drafts build and validate cleanly (make draft-lcurley-moq-lite.txt, make draft-lcurley-moq-timestamp.txt). The remaining "duration" word occurrences in moq-lite are unrelated English usage (group-drop timing, stream-reset age), not the Frame field.

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Caution

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: be23e12f-cd37-4a6a-84d3-8aaee8e20352

📥 Commits

Reviewing files that changed from the base of the PR and between 80308a3 and a5be769.

📒 Files selected for processing (2)

• draft-lcurley-moq-lite.md
• draft-lcurley-moq-timestamp.md

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Walkthrough

Both protocol specification drafts are updated to remove the Duration concept. In draft-lcurley-moq-timestamp.md, the DURATION Object Property section is deleted entirely; the abstract, TIMESCALE description, and no-timeline fallback semantics are rewritten to reference only Timestamp, and the IANA registry table is trimmed to TIMESCALE and TIMESTAMP. In draft-lcurley-moq-lite.md, Duration Delta is removed from the FRAME on-wire layout and datagram body encoding; Timestamp Delta and datagram Timestamp are now conditionally omitted when Publisher Timescale is 0, with expiration falling back to wall-clock arrival time. The moq-lite-05 changelog is updated to match.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and specifically summarizes the main change—removing Duration fields from two IETF drafts.
Description check	✅ Passed	The description is clearly related to the changeset, providing detailed explanation of what was removed and why.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/vigilant-blackwell-36c896

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