feat(cli): replaced oclif with lightweight custom CLI framework in pi-utils

- Created lightweight CLI framework in @oh-my-pi/pi-utils/cli as drop-in replacement for oclif with zero dependencies.
- Migrated coding-agent CLI from oclif framework to @oh-my-pi/pi-utils/cli with lazy command loading and simplified architecture.
- Changed default root command from 'index' to 'launch' for improved UX.
- Removed @oclif/core and @oclif/plugin-autocomplete dependencies from coding-agent package.
- Deleted custom oclif help renderer (oclif-help.ts) as help rendering is now integrated into the new CLI framework.
- Moved launch command from nested index/index.ts to top-level launch.ts for clearer command structure.

packages/coding-agent/package.json

@@ -10,14 +10,6 @@
 	"bin": {
 		"omp": "src/cli.ts"
 	},
-	"oclif": {
-		"bin": "omp",
-		"commands": "./src/commands",
-		"helpClass": "./src/cli/oclif-help.ts",
-		"plugins": [
-			"@oclif/plugin-autocomplete"
-		]
-	},
 	"main": "./src/index.ts",
 	"types": "./src/index.ts",
 	"exports": {
@@ -88,8 +80,6 @@
 	},
 	"dependencies": {
 		"@mozilla/readability": "0.6.0",
-		"@oclif/core": "^4.8.0",
-		"@oclif/plugin-autocomplete": "^3.2.40",
 		"@oh-my-pi/omp-stats": "workspace:*",
 		"@oh-my-pi/pi-agent-core": "workspace:*",
 		"@oh-my-pi/pi-ai": "workspace:*",