optimize docs

docs/plans/CASAN_PLAN_21_HYBRID_INSTALL.md

@@ -1,7 +1,7 @@
 # CASAN Plan-21 — Hybrid Global Install + `casan init`
 
 > Ngày lập: 2026-07-23  
-> Trạng thái: **IMPLEMENTED + HARDENED — global install + selectable IDE init + pinned global bootstrap + VS Code `@casan` + merge-safe (60/60 hybrid acceptance)**
+> Trạng thái: **IMPLEMENTED + HARDENED — global install + selectable IDE init + pinned global bootstrap + VS Code `@casan` + merge-safe/vendored migration (66/66 hybrid acceptance)**
 > Liên quan: [Plan-20](CASAN_PLAN_20_AGENTIC_CLIENT_INTEGRATION.md) (adapter/hook là base phổ quát), [CASAN_INSTALL_HYBRID.md](../casan/CASAN_INSTALL_HYBRID.md)
 
 ## 1. Mục tiêu
@@ -42,7 +42,7 @@ harness global thao tác đúng trên state của dự án hiện tại.
 | Integrity hash primitive | `packages/casan-harness/scripts/python/harness_hash.py` |
 | `casan init` / `verify` | `packages/casan-devkit/casan-init.py` |
 | CLI wiring | `bin/casan` (`init`, `verify-harness`) |
-| Acceptance suite | `packages/casan-devkit/tests/hybrid-install-tests.sh` — **60/60 PASS** |
+| Acceptance suite | `packages/casan-devkit/tests/hybrid-install-tests.sh` — **66/66 PASS** |
 | Adoption doc | `docs/casan/CASAN_INSTALL_HYBRID.md` |
 
 ### Level selection (4 packaging levels) & safe adoption
@@ -65,6 +65,10 @@ harness global thao tác đúng trên state của dự án hiện tại.
   `@casan` Chat Participant. Built-in Copilot không bị claim là global-intercept.
 - **Source-hub guardrail:** `init` refuses to adopt a CASAN source hub into itself
   (would block the developing agent); `--force` overrides.
+- **Vendored migration:** a consumer repo containing an older
+  `packages/casan-harness` is distinguished from the product source hub,
+  migrated without `--force`, and retains its project-owned agents, skills,
+  prompts, workflows, scripts, evidence, and compatibility harness.
 
 ## 5. Definition of Done