r3-grounding-l6-post-ratification-dispatch-receipt

[briansrls]

Summary

Publishes the R3 Grounding L6 post-ratification dispatch receipt from silent-badger-711 on a clean branch.

This intentionally carries only docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md; it avoids reopening or reusing #1780 because that closed PR contains a broad regen/codegen diff unrelated to the L6 receipt.

State

• Grounding implementation remains held until R3 Substrate lands EmissionPathProjection.
• Follow-up Grounding slice after carrier landing: projection row population, coverage.rs conversion, mixed-cell/fail-closed tests.
• MethodTemplateContract remains untouched.

Verification

Worker reported: cargo test -p v3-grounding-cross-target-meta -- --nocapture passed at the source worktree HEAD.

[briansrls]

Review metadata

• Provider / model: codex / unknown
• Commit: a6a3f084 · Trigger: schedule
• Thinking: 162s wall

---

Non-blocking — Strengths

• docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md The receipt matches the locked Option 2 handoff, keeps MethodTemplateContract as the existing authoring authority, and names the fail-closed follow-up tests before heterogeneous rows enter.

ROADMAP — Verified

• l6_method_template_per_row_projection: The follow-up shape matches the existing closure-ledger trigger by requiring per-row projection before replacing the current list-non-empty coverage mapping.

✅ No blocking concerns; the cited v3-grounding-cross-target-meta test command passes.

[briansrls]

Review metadata

• Provider / model: openai-pro / gpt-5-5-pro
• Commit: a6a3f084 · Trigger: manual
• Comparison: main @ 2b7b21b4 ... session/bold-ferret-748-l6-receipt @ a6a3f084
• Conversation: View conversation

---

1. Story of the diff

This PR adds a post-ratification dispatch receipt for R3 Grounding L6, but deliberately does not implement the grounding change yet. The receipt records that Grounding is blocked until Substrate lands an empty EmissionPathProjection carrier, then explains the intended handoff: Substrate owns the new coverage carrier shape, while Grounding will later populate projection rows and convert coverage.rs from the current hand-Rust/list-derived coverage path to per-row projection coverage. The load-bearing discipline is that MethodTemplateContract remains untouched, target identity stays on MethodTemplateContractKey, and the old list-name-to-cell mapping is explicitly not to survive once projection rows exist (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:14, :20-21, :29-32, :39).

2. Invariant categories

1. LAYER MODEL — N/A. This diff is a documentation receipt only; it does not add or mutate substrate types, Dag state, or compiler implementation code. It explicitly says “No Substrate carrier authoring in this Grounding receipt” (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:36).
2. INVARIANTS.md + modeling-discipline.md — Compliant. The receipt treats the current hand-Rust L6 walker as a bounded pre-carrier state, not as a new authority, and names the forward fact flow once the substrate carrier lands: Substrate declares the projection carrier, then Grounding reads per-row projection rows by joining MethodTemplateContractKey { target, dag_method } to EmissionPathProjection.row_identity and unioning cells (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:23, :27-30). It also preserves fail-closed intent for the follow-up by requiring tests for missing, empty, malformed, and non-joining projection rows (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:32).
3. CODING.md — N/A. No Rust implementation or helper API changes are introduced; there are no functions, methods, result shapes, or module-organization decisions to review under the coding conventions.
4. TESTING.md — Compliant. Because the diff adds no executable behavior, no new test file is required here. The receipt records the current verification command and pass status for the existing walker (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:43) and correctly pushes the behavioral regression obligations to the follow-up that will actually change coverage.rs (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:30-32).
5. LOCKED DESIGN DECISIONS — Compliant. The diff explicitly records the ratified option and the sub-question decisions now treated as locked for Grounding dispatch prep, including carrier placement, List<EmissionCell>, target authority on MethodTemplateContractKey, and empty-carrier population split (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:14-21). I do not see a hidden divergence from those decisions in this diff.
6. TRACKED vs UNTRACKED DEBT — Compliant. The temporary state is documented, bounded, and has a dissolution trigger: implementation is held until EmissionPathProjection lands (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:3), the trigger is “After Substrate lands src/v3/std/cross_target_coverage.dag with the empty carrier” (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:27), and the bounds exclude carrier authoring, MethodTemplateContract migration, premature coverage.rs/walker changes, and continued reuse of the old list-name mapping once projection is available (docs/briefs/r3-grounding-l6-post-ratification-dispatch-receipt.md:36-39).

3. Verdict

APPROVE. This is a clean documentation/dispatch receipt: it does not prematurely alter substrate or implementation code, and it records the bridge bounds, trigger, ownership split, and follow-up test obligations clearly enough for the next PR to be reviewable.

[briansrls]

Closing as session-orphan stale: author session archived; PR last updated 3+ days ago; no reviewer-actionable progress. Branch deleted. Closed by Director cleanup pass.