feat(hooks): add UserPromptSubmit and Stop executors

- Port user-prompt-submit.ts from opencode-cc-plugin (118 lines)
- Port stop.ts from opencode-cc-plugin (119 lines)
- Preserve recursion prevention logic (<user-prompt-submit-hook> tags)
- Preserve inject_prompt support (message injection, stop prompt injection)
- Preserve stopHookActiveState management (per-session state)
- Import path adjustments: ../types → ./types, ../../config → ./plugin-config
- All exit code handling preserved (exitCode 2 → block, etc.)

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/claude-code-hooks/stop.ts

@@ -0,0 +1,118 @@
+import type {
+  StopInput,
+  StopOutput,
+  ClaudeHooksConfig,
+} from "./types"
+import { findMatchingHooks, executeHookCommand, log } from "../../shared"
+import { DEFAULT_CONFIG } from "./plugin-config"
+import { getTodoPath } from "./todo"
+import { isHookCommandDisabled, type PluginExtendedConfig } from "./config-loader"
+
+// Module-level state to track stop_hook_active per session
+const stopHookActiveState = new Map<string, boolean>()
+
+export function setStopHookActive(sessionId: string, active: boolean): void {
+  stopHookActiveState.set(sessionId, active)
+}
+
+export function getStopHookActive(sessionId: string): boolean {
+  return stopHookActiveState.get(sessionId) ?? false
+}
+
+export interface StopContext {
+  sessionId: string
+  parentSessionId?: string
+  cwd: string
+  transcriptPath?: string
+  permissionMode?: "default" | "acceptEdits" | "bypassPermissions"
+  stopHookActive?: boolean
+}
+
+export interface StopResult {
+  block: boolean
+  reason?: string
+  stopHookActive?: boolean
+  permissionMode?: "default" | "plan" | "acceptEdits" | "bypassPermissions"
+  injectPrompt?: string
+}
+
+export async function executeStopHooks(
+  ctx: StopContext,
+  config: ClaudeHooksConfig | null,
+  extendedConfig?: PluginExtendedConfig | null
+): Promise<StopResult> {
+  if (ctx.parentSessionId) {
+    return { block: false }
+  }
+
+  if (!config) {
+    return { block: false }
+  }
+
+  const matchers = findMatchingHooks(config, "Stop")
+  if (matchers.length === 0) {
+    return { block: false }
+  }
+
+  const stdinData: StopInput = {
+    session_id: ctx.sessionId,
+    transcript_path: ctx.transcriptPath,
+    cwd: ctx.cwd,
+    permission_mode: ctx.permissionMode ?? "bypassPermissions",
+    hook_event_name: "Stop",
+    stop_hook_active: stopHookActiveState.get(ctx.sessionId) ?? false,
+    todo_path: getTodoPath(ctx.sessionId),
+    hook_source: "opencode-plugin",
+  }
+
+  for (const matcher of matchers) {
+    for (const hook of matcher.hooks) {
+      if (hook.type !== "command") continue
+
+      if (isHookCommandDisabled("Stop", hook.command, extendedConfig ?? null)) {
+        log("Stop hook command skipped (disabled by config)", { command: hook.command })
+        continue
+      }
+
+      const result = await executeHookCommand(
+        hook.command,
+        JSON.stringify(stdinData),
+        ctx.cwd,
+        { forceZsh: DEFAULT_CONFIG.forceZsh, zshPath: DEFAULT_CONFIG.zshPath }
+      )
+
+      // Check exit code first - exit code 2 means block
+      if (result.exitCode === 2) {
+        const reason = result.stderr || result.stdout || "Blocked by stop hook"
+        return {
+          block: true,
+          reason,
+          injectPrompt: reason,
+        }
+      }
+
+       if (result.stdout) {
+         try {
+           const output = JSON.parse(result.stdout) as StopOutput
+           if (output.stop_hook_active !== undefined) {
+             stopHookActiveState.set(ctx.sessionId, output.stop_hook_active)
+           }
+           const isBlock = output.decision === "block"
+           // Determine inject_prompt: prefer explicit value, fallback to reason if blocking
+           const injectPrompt = output.inject_prompt ?? (isBlock && output.reason ? output.reason : undefined)
+           return {
+             block: isBlock,
+             reason: output.reason,
+             stopHookActive: output.stop_hook_active,
+             permissionMode: output.permission_mode,
+             injectPrompt,
+           }
+         } catch {
+           // Ignore JSON parse errors - hook may return non-JSON output
+         }
+       }
+    }
+  }
+
+  return { block: false }
+}