docs(compose-solution): prior-art grep paths + phase-5 cross-refs for 10 pipelines + 21 primitives

skills/compose-solution/phase-3-prior-art.md

@@ -8,7 +8,14 @@ For EACH component from Phase 2, run three independent searches in parallel
 ```bash
 # Replace <keywords> with the component's 3-5 distinctive keywords as an
 # ERE alternation like (foo|bar|baz).
-grep -rinlE '<keywords>' _blocks/ _manifests/ _primitives/ skills/ _bridges/ hooks/ 2>/dev/null
+# The 7 paths cover: behavioral blocks, agent manifests, shell primitives,
+# Rust primitive crates (source + Cargo.toml), all skills, cross-tool
+# bridges, and enforced hooks. grep -r recurses, so _primitives/ catches
+# both *.sh and _rust/<crate>/src/*.rs — but _primitives/_rust/ is listed
+# explicitly for discoverability when someone reads this file.
+grep -rinlE '<keywords>' \
+  _blocks/ _manifests/ _primitives/ _primitives/_rust/ \
+  skills/ _bridges/ hooks/ 2>/dev/null
 ```
 
 ## 3b — Personal bundle reuse (conditional, skip on missing)

skills/compose-solution/phase-5-architecture.md

@@ -19,6 +19,25 @@ XLSX / PPTX / CSV), reference the `tomd` primitive
 over rewrite". The PreToolUse(Read) hook `tomd-preread.sh` already redirects
 Claude to the converted markdown transparently.
 
+### Pipeline / primitive cross-refs (reuse before rewrite)
+
+If the user's task maps onto an existing hub-and-spoke pipeline, recommend
+it instead of composing from scratch. Each pipeline is itself discoverable
+via Phase 3 grep, but surface it explicitly so the user sees the option:
+
+- VM / server provisioning → `/vm-provision` + `ssh-check` + `firewall-diff`
+- Database schema design → `/schema-design` + `kei-migrate` (PG/SQLite/MySQL)
+- Metrics + logs observability → `/observability-setup` + `metrics-scrape` + `log-ship`
+- Authentication / session / JWT / OAuth → `/auth-setup`
+- CI/CD workflow scaffolding → `/ci-scaffold` + `kei-ci-lint`
+- REST / GraphQL / gRPC API contract → `/api-design`
+- Doc site + changelog automation → `/docs-scaffold` + `kei-changelog`
+- Test matrix (unit / integration / e2e / visual) → `/test-matrix`
+- Frontend site / UI WYSIWYD loop → `/site-create` + `mock-render` + `visual-diff` + `tokens-sync`
+- Multi-agent project bootstrap → `/new-project` + `kei-ledger` (RULE 0.12 fork tracking)
+
+One-line per reference, click-discoverable, no duplication of pipeline logic.
+
 ## 5b — What is UNNECESSARY?
 
 For each block listed, justify why it's in. If a block can be removed