refactor: simplify yolo mode implementation by removing env vars

Remove HAPPY_GEMINI_ARGS and HAPPY_GEMINI_COMMAND environment variables.
Refactor gemini.ts to export registerGeminiAgent(yolo) function that
directly configures args instead of reading from environment.

cli/README.md

@@ -81,11 +81,6 @@ See `src/configuration.ts` for all options.
 - `HAPI_DAEMON_HEARTBEAT_INTERVAL` - Heartbeat interval in ms (default: 60000).
 - `HAPI_DAEMON_HTTP_TIMEOUT` - HTTP timeout for daemon control in ms (default: 10000).
 
-### Gemini/Agent
-
-- `HAPPY_GEMINI_COMMAND` - Gemini executable command (default: gemini).
-- `HAPPY_GEMINI_ARGS` - Gemini arguments (default: --experimental-acp).
-
 ## Storage
 
 Data is stored in `~/.hapi/` (or `$HAPI_HOME`):

cli/src/agent/runners/gemini.ts

@@ -1,12 +1,6 @@
 import { AgentRegistry } from '@/agent/AgentRegistry';
 import { AcpSdkBackend } from '@/agent/backends/acp';
 
-function parseArgs(value?: string): string[] | null {
-    if (!value) return null;
-    const parts = value.split(' ').map((part) => part.trim()).filter(Boolean);
-    return parts.length > 0 ? parts : null;
-}
-
 function buildEnv(): Record<string, string> {
     return Object.keys(process.env).reduce((acc, key) => {
         const value = process.env[key];
@@ -17,16 +11,13 @@ function buildEnv(): Record<string, string> {
     }, {} as Record<string, string>);
 }
 
-const command = process.env.HAPPY_GEMINI_COMMAND
-    || process.env.GEMINI_ACP_COMMAND
-    || 'gemini';
+export function registerGeminiAgent(yolo: boolean): void {
+    const args = ['--experimental-acp'];
+    if (yolo) args.push('--yolo');
 
-const args = parseArgs(process.env.HAPPY_GEMINI_ARGS)
-    ?? parseArgs(process.env.GEMINI_ACP_ARGS)
-    ?? ['--experimental-acp'];
-
-AgentRegistry.register('gemini', () => new AcpSdkBackend({
-    command,
-    args,
-    env: buildEnv()
-}));
+    AgentRegistry.register('gemini', () => new AcpSdkBackend({
+        command: 'gemini',
+        args,
+        env: buildEnv()
+    }));
+}

cli/src/index.ts

@@ -157,18 +157,9 @@ import { getCliArgs } from './utils/cliArgs'
         }
       }
 
-      if (yolo) {
-        const existingArgs = process.env.HAPPY_GEMINI_ARGS ?? process.env.GEMINI_ACP_ARGS ?? '';
-        if (!existingArgs.includes('--yolo')) {
-          const nextArgs = existingArgs.trim().length > 0
-            ? `${existingArgs} --yolo`
-            : '--yolo';
-          process.env.HAPPY_GEMINI_ARGS = nextArgs;
-        }
-      }
-
-      await import('./agent/runners/gemini');
+      const { registerGeminiAgent } = await import('./agent/runners/gemini');
       const { runAgentSession } = await import('./agent/runners/runAgentSession');
+      registerGeminiAgent(yolo);
 
       await initializeToken();
       await authAndSetupMachineIfNeeded();