docs(p15): add G9G product loop mini-plan

sw-block/design/v3-phase-15-g9g-blockmaster-product-loop-mini-plan.md

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+# V3 Phase 15 G9G - Blockmaster Product Loop To Publisher Mini-Plan
+
+Date: 2026-05-03
+Status: architect draft; red tests first, production wiring requires §1.A acceptance
+Branch target: `p15-g9g/blockmaster-product-loop`
+Scope: first live blockmaster loop that turns verified placement into publisher input
+
+## 0. Why This Gate Exists
+
+G9D/F proved the fact layer:
+
+```text
+DesiredVolume + NodeInventory + PlacementIntent + Observation -> VerifiedPlacement
+```
+
+G9F-2 proved the ask bridge:
+
+```text
+VerifiedPlacement -> authority.AssignmentAsk
+```
+
+G9G is the first product-loop slice:
+
+```text
+blockmaster lifecycle loop -> G9F-2 bridge -> authority.Publisher -> AssignmentFact
+```
+
+This is the first point where product lifecycle state can cause a real assignment
+to be published. That is useful for M01, but it is also the authority boundary.
+
+## 1.A Architect Bindings
+
+Proposed for ratification:
+
+1. **Publisher-only minting**: G9G may feed `authority.AssignmentAsk` into the existing publisher path; it must not construct `AssignmentInfo` or `AssignmentFact`.
+2. **Verified-only input**: only `VerifiedPlacement{Verified:true}` can produce a live ask.
+3. **Negative inputs**: placement-only, observation-only, and unverified placement must not publish.
+4. **Loop idempotency**: repeated product-loop ticks for the same verified placement must not create duplicate authority churn.
+5. **No proto change**: first slice uses existing in-process host/master seams and existing assignment subscription protocol.
+6. **No frontend-ready shortcut**: receiving/publishing an assignment is not the same as frontend readiness.
+7. **Stop rule**: if create-volume API, CSI, replica allocation for blank pools, or control-proto changes are needed, split a follow-up gate.
+
+## 2. Algorithm Sketch
+
+For one product-loop tick:
+
+1. Load lifecycle stores.
+2. Reconcile desired volumes + node inventory into placement intents.
+3. Verify placements against observation.
+4. Convert verified placements to assignment asks via G9F-2 bridge.
+5. Append asks into the master publisher directive seam.
+6. Publisher mints epoch/endpoint-version and fan-outs assignment facts.
+
+The loop must skip asks that already match the publisher's current authority
+line. First slice can handle existing-replica placement only; blank-pool
+replica-id allocation remains out of scope.
+
+## 3. TDD Plan
+
+Red tests first:
+
+1. `TestG9G_ProductLoopPublishesVerifiedExistingReplica`
+   - lifecycle placement + fresh observation;
+   - product-loop tick emits one ask;
+   - real publisher mints one authority line.
+
+2. `TestG9G_ProductLoopDoesNotPublishUnverifiedPlacement`
+   - placement exists but observation missing/stale;
+   - publisher line remains absent.
+
+3. `TestG9G_ProductLoopIsIdempotentForSameAuthorityLine`
+   - two ticks against same verified placement;
+   - publisher line remains stable; no epoch churn.
+
+4. `TestG9G_BlockvolumeSubscriptionReceivesProductLoopAssignment`
+   - subscriber listens through existing assignment stream/seam;
+   - product-loop tick publishes assignment;
+   - subscriber receives the minted assignment fact.
+
+5. `TestG9G_NoDirectAssignmentInfoConstructionOutsideAllowlist`
+   - existing structural guard remains green.
+
+## 4. Close Criteria
+
+G9G first slice closes when:
+
+1. tests in §3 pass;
+2. no proto/control API change;
+3. no `AssignmentInfo` construction outside authority/allowed decoder seams;
+4. blockmaster host has a callable product-loop tick;
+5. docs state that assignment publication still does not imply frontend readiness.
+
+## 5. Non-Claims
+
+- No external create-volume API.
+- No CSI integration.
+- No blank-pool replica id allocator.
+- No M01 hardware smoke.
+- No quorum/full-ACK policy.
+- No frontend-ready claim.
+
+## 6. Next After G9G
+
+If G9G closes, the next M01-oriented slice is a subprocess L2:
+
+```text
+real blockmaster + real blockvolume subscription + product-loop tick -> assignment delivered
+```
+
+Only after that should we wire external API/CLI verbs or CSI create/publish.