feat: add agor-pro commercial plugin crate and dual-repo infrastructure

agor-pro Tauri 2.x plugin (feature-gated via --features pro),
commercial Tauri config overlay, asymmetric test setup,
CI workflows (leak-check, commercial-build, PAT health),
pre-push hook, Makefile, CONTRIBUTING/MAINTENANCE/LICENSE-COMMERCIAL.

Makefile

@@ -0,0 +1,36 @@
+.PHONY: setup build build-pro test test-pro sync clean
+
+# --- Community ---
+
+setup:
+	git config core.hooksPath .githooks
+	npm install
+	@echo "Git hooks configured and dependencies installed."
+
+build:
+	cargo build
+	npm run build
+
+test:
+	npm run test:all
+
+# --- Commercial ---
+
+build-pro:
+	cargo build --features pro
+	npm run build
+	@echo "For Tauri release: cargo tauri build -- --features pro --config src-tauri/tauri.conf.commercial.json"
+
+test-pro:
+	cargo test --features pro
+	AGOR_EDITION=pro npx vitest run
+
+# --- Maintenance ---
+
+sync:
+	git fetch origin
+	git merge origin/main
+
+clean:
+	cargo clean
+	rm -rf node_modules/.vite