fix: correct Abiba platform label (pi not openclaw), add plugin skeletons, shared config, fix health port

- Replace all 'openclaw' references with 'pi' (pi coding harness)
- Fix Git remote URL in CONTEXT.md
- Harmonize health port to 9200 across all docs
- Add config.yaml.example with full schema
- Add pi-zulip-extension skeleton (TypeScript, pi Extension API)
- Add hermes-zulip-plugin skeleton (Python, BasePlatformAdapter)
- Add agent-zero-plugin skeleton (Python, A0 plugin API)
- Update ADR-007 with pi extension docs reference
- Document private topic ACL v1 limitation in CONTEXT.md

pi-zulip-extension/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": "dist",
+    "rootDir": "src",
+    "declaration": true,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*.ts"]
+}