Use @mariozechner/jiti fork with virtualModules for extension loading in Bun binary

- Switch from jiti to @mariozechner/jiti fork
- Use virtualModules option for bundled packages in compiled binary
- Disable tryNative so jiti handles all nested imports
- Lazy-load pi-coding-agent to avoid circular dependency

packages/coding-agent/package.json

@@ -39,6 +39,7 @@
 	},
 	"dependencies": {
 		"@mariozechner/clipboard": "^0.3.0",
+		"@mariozechner/jiti": "^2.6.2",
 		"@mariozechner/pi-agent-core": "^0.45.2",
 		"@mariozechner/pi-ai": "^0.45.2",
 		"@mariozechner/pi-tui": "^0.45.2",
@@ -47,7 +48,6 @@
 		"diff": "^8.0.2",
 		"file-type": "^21.1.1",
 		"glob": "^11.0.3",
-		"jiti": "^2.6.1",
 		"marked": "^15.0.12",
 		"minimatch": "^10.1.1",
 		"proper-lockfile": "^4.1.2",