docs(#771): bind tier importer to verified target

docs/scratchpads/771-kbn101-db-role-split.md

@@ -126,3 +126,13 @@ Independent Codex review found two blockers and security review found two medium
 - **TDD decision:** skipped as not applicable: this is a documentation-only contract remediation. Future KBN-101-00/-02/-06 tests are specified as the situational evidence; no source/test artifact is permitted in this task.
 - **Final scope correction:** Per control-plane direction, remediation remains bounded to the two Ultron findings. The active guide is explicitly a non-operative KBN-101 contract until its owned implementation/activation lands; no additional design, source, CI, deployment, secret, or test artifact was added.
 - **Validation evidence:** target-image/container role proof PASS (pgvector `0.8.2`, `relocatable=true`, trusted absent/untrusted; external-superuser `SET ROLE`/`RESET ROLE`; exact extension/schema/owner-bearing-member ownership; zero membership and service-role denials). Changed-doc Prettier, strict native-kanban contract TypeScript, local-link resolver (8 docs), finite operator-doc inventory (one active KBN-101-07 route with no credential argv in executable blocks), source-path check (6 current paths), and `git diff --check` PASS. Pre-existing `.mosaic/orchestrator/{mission.json,session.lock}` remains intentionally excluded.
+
+## 2026-07-15 — rc.11 exact-head re-review remediation intake
+
+- **Objective / scope:** Close only HIGH-1 and HIGH-2 in `/home/hermes/agent-work/reviews/771-kbn101-contract-rereview5-f60144e.md` against `f60144eb3eab6234ab01bda592052081c777897e`: target-bind the non-DDL tier importer with a runner-produced signed attestation, and disposition every current non-normative documentation scanner hit, including the active user-guide route and federation historical status. Documentation only; no source/config/Compose/CI/deployment/secret/migration edits and no `.mosaic` staging.
+- **Frozen decision:** `mosaic-db-migrator --verify` is trusted only after TLS/identity/manifest/schema verification and signs a credential-free JCS/Ed25519 v1 artifact from a runner-only fixed root-owned private-key file. The artifact binds secret version/exact URL-file digest, canonical TLS/CA/SPKI/server/database/importer/manifest/schema identity, issued/expiry/nonce, and producer build/correlation; importer gets pinned public key plus artifact only. It validates both files and all bindings before target connection, opens/digests/connects from one in-memory URL read, validates server identity before DML, and distinguishes zero connection from zero DML. Key overlap/revocation, secret-rotation invalidation, replay cache, atomic rename, and sanitized errors are mandatory.
+- **Ownership:** -03 owns producer/signing DTO/tests; -02 importer interface/verification tests; -05 key/artifact mounts/render tests; -06 inventory/matrix and non-masking scanner tests; -07 operator guide. The exact manifests remain disjoint.
+- **Operator correction:** `storage migrate` is schema-wrapper delegation only; legacy `--from hot --to cold` tier-copy guidance is unavailable. Secure tier copy is `migrate-tier` with `--target-url-file` plus `--target-attestation-file`. Federation M1 task language is status-only and adjacent KBN-101 text says it authorizes no current DDL.
+- **TDD decision:** skipped as not applicable: this bounded task changes documentation only. Future -02/-03/-05/-06 tests are specified as the required implementation evidence.
+- **Validation / review:** Prettier PASS on all 18 changed Markdown/root-doc files; `pnpm exec tsc --noEmit -p docs/native-kanban-sot/tsconfig.json` PASS; changed-doc local-link resolver PASS (71 links); full current docs scanner/disposition PASS (10 non-normative paths, 4 normative-contract paths; no unknown active command); legacy `storage migrate --from` and raw target-URL bypass scan PASS; attestation field/interface assertion PASS; exact source ownership/manifest-overlap assertion PASS; `git diff --check`, docs-only scope, and secret-leak scan PASS. Manual documentation/security review verified key isolation, JCS/detached signature, secret-file hash as non-secret evidence, verification ordering/TOCTOU/replay/rotation, no connection vs zero DML, non-masking scanner class, status-only federation history, and no regression to pgvector closure. No source-code TDD applies.
+- **Pending delivery:** stage docs only, commit, queue guard, push, and verify exact remote SHA. Then idle for independent exact-head re-review and Ultron reverify. `.mosaic/orchestrator/{mission.json,session.lock}` remains pre-existing and excluded.