moq-lite-05: restore Publisher Max Latency, min-of-two expiration, drop compression

[kixelated]

Summary

Three changes to draft-lcurley-moq-lite.md, all under the in-progress moq-lite-05 changelog:

Restore Publisher Max Latency

Added back to TRACK_INFO (immutable per-track property) with maximum cache-retention semantics — an upper bound on how long the publisher caches a non-latest group, the inverse of an HTTP Cache-Control: max-age guarantee. Subscribers MUST NOT assume an older group is still available even within the bound. Since Max Latency is two-sided again, the Subscriber prefix is restored on the subscriber field (SUBSCRIBE / SUBSCRIBE_UPDATE).

Note: the previous Publisher Cache field (before removal in #34) was a minimum guarantee — this is deliberately the opposite, matching the name and mirroring Subscriber Max Latency as an upper bound on staleness.

Minimum-of-two expiration

A group's age is now measured two ways and it expires once either exceeds Max Latency (its effective lifetime is the minimum of the two):

• Timestamp age — media-time delta (relay-stable, jitter-immune).
• Wall-clock age — arrival/queue-time delta.

The two backstop each other: a publisher can't keep stale groups alive with fresh-looking timestamps (wall-clock evicts anyway), and a delivery burst (e.g. catching up at subscription start) doesn't reset age (timestamp age evicts the media-old ones). Empty groups still fall back to wall-clock only.

Drop compression

Reverted the ANNOUNCE_BROADCAST DEFLATE compression added in #44 — it now lives in the standalone draft-lcurley-moq-namespace-compression.md extension. Removed the Compressed Payload wrapper, the compression section, the Announce-Stream compression-context prose, and the now-unused RFC1951 / RFC7692 references. No compress/deflate text remains in the draft.

Validation

make draft-lcurley-moq-lite.txt passes (kramdown-rfc + xml2rfc OK).

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a2925473-b080-4b2b-8d0c-26f6f2e80143

📥 Commits

Reviewing files that changed from the base of the PR and between 23b75c4 and 2fe3f03.

📒 Files selected for processing (1)

• draft-lcurley-moq-lite.md

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Walkthrough

The draft splits the single Max Latency track preference into two distinct fields: Subscriber Max Latency (delivery-time staleness bound for non-latest groups, carried in SUBSCRIBE and SUBSCRIBE_UPDATE) and Publisher Max Latency (cache retention bound, carried in TRACK_INFO). The Expiration section is rewritten so that expiration triggers when either timestamp-based age or wall-clock-based age exceeds the applicable bound, with added handling for zero-frame groups. The Frame timestamp description is updated to name both inputs to expiration. The ANNOUNCE_BROADCAST encoding is reorganized and the entire Compressed ANNOUNCE_BROADCAST Payloads subsection (DEFLATE context, sync-flush, and decompression failure rules) is removed, along with the RFC1951 and RFC7692 normative references. The changelog for moq-lite-05 is updated accordingly.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the three main changes: latency fields, expiration semantics, and compression removal.
Description check	✅ Passed	The description is directly aligned with the changeset and explains the same three draft updates in sufficient detail.
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.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/inspiring-herschel-08c804

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