chore: add continuity plugin package skeleton

plugins/continuity/README.md

@@ -0,0 +1,41 @@
+# Continuity Plugin (MVP)
+
+This package is the skeleton for extracting the current approved-plan continuity hard gate into an installable plugin.
+
+## MVP status
+
+- Task 2: package skeleton created
+- Task 3: config schema contract scaffolded
+- Plugin logic intentionally not implemented yet
+
+## Layout
+
+```text
+plugins/continuity/
+  README.md
+  README.zh-TW.md
+  HOOK.md
+  package.json
+  examples/
+  src/
+  test/
+```
+
+## Planned public surface
+
+- `src/config/schema.mjs`
+- `src/config/defaults.mjs`
+- `src/continuity/evaluator.mjs`
+- `src/continuity/receipt-validator.mjs`
+- `src/adapters/force-recall.mjs`
+- `src/index.mjs`
+
+## Example config
+
+See `examples/openclaw.continuity.example.json`.
+
+## Notes
+
+- Current terminal states preserved by default: `waiting_user`, `blocked`, `pending_verification`
+- Default receipt directory target: `state/approved-plan-continuity`
+- `npm test` is reserved for the full plugin test suite defined by the implementation plan