feat: add --model parameter support to command handlers

Pass model selection through command pipeline to enable model switching during runtime

close #83, close #64

cli/src/commands/claude.ts

@@ -41,6 +41,13 @@ export const claudeCommand: CommandDefinition = {
             } else if (arg === '--dangerously-skip-permissions') {
                 options.permissionMode = 'bypassPermissions'
                 unknownArgs.push(arg)
+            } else if (arg === '--model') {
+                const model = args[++i]
+                if (!model) {
+                    throw new Error('Missing --model value')
+                }
+                options.model = model
+                unknownArgs.push('--model', model)
             } else if (arg === '--started-by') {
                 options.startedBy = args[++i] as 'runner' | 'terminal'
             } else {

cli/src/commands/codex.ts

@@ -17,6 +17,7 @@ export const codexCommand: CommandDefinition = {
                 codexArgs?: string[]
                 permissionMode?: CodexPermissionMode
                 resumeSessionId?: string
+                model?: string
             } = {}
             const unknownArgs: string[] = []
 
@@ -36,6 +37,13 @@ export const codexCommand: CommandDefinition = {
                 } else if (arg === '--yolo' || arg === '--dangerously-bypass-approvals-and-sandbox') {
                     options.permissionMode = 'yolo'
                     unknownArgs.push(arg)
+                } else if (arg === '--model') {
+                    const model = commandArgs[++i]
+                    if (!model) {
+                        throw new Error('Missing --model value')
+                    }
+                    options.model = model
+                    unknownArgs.push('--model', model)
                 } else {
                     unknownArgs.push(arg)
                 }

cli/src/commands/gemini.ts

@@ -14,6 +14,7 @@ export const geminiCommand: CommandDefinition = {
                 startedBy?: 'runner' | 'terminal'
                 startingMode?: 'local' | 'remote'
                 permissionMode?: GeminiPermissionMode
+                model?: string
             } = {}
 
             for (let i = 0; i < commandArgs.length; i++) {
@@ -29,6 +30,12 @@ export const geminiCommand: CommandDefinition = {
                     }
                 } else if (arg === '--yolo') {
                     options.permissionMode = 'yolo'
+                } else if (arg === '--model') {
+                    const model = commandArgs[++i]
+                    if (!model) {
+                        throw new Error('Missing --model value')
+                    }
+                    options.model = model
                 }
             }