docs(quest): plan m2 lite-07 announcement prefix table

[kixelated]

Problem

Repeated customer and channel path tuples consume MoQ-lite control-stream bytes across the relay mesh. Lite-06 removes repeated paths from END and UPDATE, but START still carries the path suffix.

Approach

• Plan a bounded, per-Announce-Stream prefix table for lite-07, after lite-06 rolls out, as the m2 quest quest/m2/announce-prefix-table.md, ranked in quest/m2/README.md alongside the other routing and transport studies.
• Require literal fallback, malformed-reference tests, mixed-version behavior, and a controlled QUIC-byte benchmark.
• Lite-07 is shared with hidden broadcasts (chore(quest): plan hidden broadcasts #3980): whichever lands first defines the version, and the other joins or bumps it.

Impact

• Planning only; no public API or wire change in this PR.

Alternatives

• A cross-stream QPACK-style table adds synchronization and blocking risk to this ordered control stream.

Follow-ups

• Implement the quest upstream, then enable the released lite-07 version on the moq.pro internal mesh after its lite-06 rollout.

(written by GPT-6)

Takeover: merged origin/main to adopt the milestone layout, moved the quest from quest/next/ to quest/m2/ at the maintainer's request, repointed its Related links to /quest/m1/relay-memory.md and /quest/m1/pop-skipping/README.md, dropped the stale "opt-in" wording for lite-06, and noted the shared lite-07 claim with #3980.

(written by Claude Opus 5.5)

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 79b04cdf-b068-47c5-9be0-df9683744095

📥 Commits

Reviewing files that changed from the base of the PR and between 1ca58e8 and c18cd29.

📒 Files selected for processing (2)

• quest/m2/README.md
• quest/m2/announce-prefix-table.md

Walkthrough

The PR adds a planning document for a bounded prefix table on ordered MoQ-lite announce streams. It defines lite-07 insert, reference, and literal forms for ANNOUNCE_START suffixes, bounded state, eviction, reset, fallback, and invalid-reference handling. It also specifies version behavior, tests, and QUIC-byte benchmarking. The README lists the new quest.

Priority: ⬇️ Low

Merge Risk: 🟡 Moderate · up to 1ca58

The lite-07 plan needs a precise shared wire and state contract before implementation so independent encoders and decoders do not produce incompatible announce streams.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Title check	✅ Passed	The title clearly identifies a documentation change that plans the lite-07 announcement prefix table. It is concise and related to the primary changes.
Description check	✅ Passed	The description accurately explains the problem, planned approach, scope, alternatives, and follow-up work for the announcement prefix table.

✨ Finishing Touches

✨ Simplify code

• Commit to this branch
• Create a new PR

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[moq-bot]

No issues found.
Verdict: approve
(Written by Muse Spark)

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@quest/next/announce-prefix-table.md`:
- Around line 16-21: Expand the lite-07 prefix-table specification around the
ANNOUNCE_START path-suffix handling to define the wire fields for insert,
reference, and literal forms; maximum entry count and total byte limits;
insertion timing; deterministic eviction order; stream-reset trigger; and exact
validation for invalid references and lengths. Ensure encoder and decoder state
updates occur in stream order, and link to a normative draft section if these
rules are defined externally.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 010cd60a-8f21-418c-bcee-405db07f2f15

📥 Commits

Reviewing files that changed from the base of the PR and between e339399 and 1ca58e8.

📒 Files selected for processing (2)

• quest/next/README.md
• quest/next/announce-prefix-table.md

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[moq-bot]

No issues found.
Verdict: approve
(Written by Muse Spark)

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[kixelated]

Automated review

What this does

Adds a quest plan for a bounded, per-Announce-Stream prefix table in lite-07: insert/reference/literal forms for ANNOUNCE_START path suffixes after lite-06’s path-less END/UPDATE, with deterministic eviction, stream-local state, mixed-version negotiation, malformed-reference tests, and a controlled QUIC-byte benchmark shaped like health-project path prefixes.

Strengths

• Correctly sequences after lite-06 rollout and rejects a cross-stream QPACK-style table (sync/blocking risk on an ordered control stream).
• Requires literal fallback, bound on entries/bytes, and measured incremental gain vs lite-06 ID-based END alone — avoids shipping compression for its own sake.
• First adopter scoped to the internal mesh; customer clients need not move immediately.
• Planning-only: no API or wire change in this PR.

Concerns

• None material for a quest doc. Implementation will need to keep reconstructed path / usage-reported length behavior identical to the goal statement — call that out again when the wire PR lands.

Recommendation rationale

Low-risk planning artifact with a sound alternative analysis and clear validation bar. Ready to merge as the lite-07 backlog item.

MERGE

This is an automated review, not the maintainer's decision
(Written by Grok)

[kixelated]

Took over from GPT-6: merged origin/main, moved the quest to quest/m2/announce-prefix-table.md (ranked before routing cost domains in the m2 list), repointed Related links to the m1 paths, dropped the stale lite-06 "opt-in" wording, and noted in the Plan that lite-07 is shared with hidden broadcasts (#3980). just check and CI pass.

(written by Claude Opus 5.5)