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)

notepad.md

@@ -642,3 +642,100 @@ All tasks execution STARTED: Thu Dec 4 16:52:57 KST 2025
 
 ---
 
+## [2025-12-09 17:58] - Task 6: user-prompt-submit.ts + stop.ts 포팅
+
+### DISCOVERED ISSUES
+- None - straightforward file copy with import path adjustments
+
+### IMPLEMENTATION DECISIONS
+- Copied user-prompt-submit.ts (118 lines) from opencode-cc-plugin → oh-my-opencode
+- Copied stop.ts (119 lines) from opencode-cc-plugin → oh-my-opencode
+- Import path adjustments (both files):
+  * `../types` → `./types`
+  * `../../shared` → `../../shared` (unchanged)
+  * `../../config` → `./plugin-config`
+  * `../../config-loader` → `./config-loader`
+  * `../todo` → `./todo` (stop.ts only)
+- Preserved recursion prevention logic in user-prompt-submit.ts:
+  * Tags: `<user-prompt-submit-hook>` (open/close)
+  * Check if prompt already contains tags → return early
+  * Wrap hook stdout with tags to prevent infinite recursion
+- Preserved inject_prompt support:
+  * user-prompt-submit: messages array collection for injection
+  * stop: injectPrompt field in result (from output.inject_prompt or output.reason)
+- Preserved stopHookActiveState management in stop.ts:
+  * Module-level Map<string, boolean> for per-session state
+  * setStopHookActive(), getStopHookActive() exported
+  * State persists across hook invocations
+- Preserved exit code handling:
+  * stop.ts: exitCode === 2 → block with reason
+  * user-prompt-submit.ts: exitCode !== 0 → check JSON for decision: "block"
+
+### PROBLEMS FOR NEXT TASKS
+- Task 7 (hook-message-injector) will use the message injection pattern
+- Task 8 (Factory + Integration) will wire these hooks to OpenCode lifecycle events
+
+### VERIFICATION RESULTS
+- Ran: `bun run typecheck` → exit 0, no errors
+- Ran: `bun run build` → exit 0, successful
+- Files created:
+  * `src/hooks/claude-code-hooks/user-prompt-submit.ts` (115 lines)
+  * `src/hooks/claude-code-hooks/stop.ts` (119 lines)
+- Functions available:
+  * executeUserPromptSubmitHooks() with UserPromptSubmitContext → UserPromptSubmitResult
+  * executeStopHooks() with StopContext → StopResult
+  * setStopHookActive(), getStopHookActive()
+- Recursion prevention verified: lines 47-52 check for tag presence
+- inject_prompt field verified: stop.ts line 102 sets injectPrompt from output
+
+### LEARNINGS
+- user-prompt-submit uses tag wrapping pattern to prevent infinite hook loops
+- stop hook can inject prompts into session via injectPrompt result field
+- stopHookActiveState Map persists across hook invocations (module-level state)
+- getTodoPath() from ./todo provides todo file path for Stop hook context
+- Source files:
+  * `/Users/yeongyu/local-workspaces/opencode-cc-plugin/src/claude-compat/hooks/user-prompt-submit.ts` (118 lines)
+  * `/Users/yeongyu/local-workspaces/opencode-cc-plugin/src/claude-compat/hooks/stop.ts` (119 lines)
+
+소요 시간: ~3분
+
+---
+
+## [2025-12-09 17:58] - Task 7: hook-message-injector 포팅
+
+### DISCOVERED ISSUES
+- None - straightforward file copy task
+
+### IMPLEMENTATION DECISIONS
+- Created `src/features/hook-message-injector/` directory
+- Copied 4 files from opencode-cc-plugin → oh-my-opencode:
+  * constants.ts (9 lines): XDG-based path definitions (MESSAGE_STORAGE, PART_STORAGE)
+  * types.ts (46 lines): MessageMeta, OriginalMessageContext, TextPart interfaces
+  * injector.ts (142 lines): injectHookMessage() implementation with message/part storage
+  * index.ts (3 lines): Barrel export
+- No import path changes needed - module is self-contained
+- Preserved XDG_DATA_HOME environment variable support
+- Preserved message fallback logic: finds nearest message with agent/model/tools if not provided
+
+### PROBLEMS FOR NEXT TASKS
+- Task 8 (Factory + Integration) will import injectHookMessage from this module
+- Hook executors (user-prompt-submit, stop) can use injectHookMessage to store hook messages
+
+### VERIFICATION RESULTS
+- Ran: `bun run typecheck` → exit 0, no errors
+- Files created: src/features/hook-message-injector/ (4 files)
+- Functions exported: injectHookMessage()
+- Types exported: MessageMeta, OriginalMessageContext, TextPart
+- Constants exported: MESSAGE_STORAGE, PART_STORAGE (XDG-based paths)
+
+### LEARNINGS
+- Message injector uses XDG_DATA_HOME for storage (~/.local/share/opencode/storage/)
+- Message storage structure: sessionID → messageID.json (meta) + partID.json (content)
+- Fallback logic: searches recent messages for agent/model/tools if originalMessage is incomplete
+- Part-based storage allows incremental message building
+- Source: `/Users/yeongyu/local-workspaces/opencode-cc-plugin/src/features/hook-message-injector/`
+
+소요 시간: ~2분
+
+---
+

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 }
+}

src/hooks/claude-code-hooks/user-prompt-submit.ts

@@ -0,0 +1,117 @@
+import type {
+  UserPromptSubmitInput,
+  PostToolUseOutput,
+  ClaudeHooksConfig,
+} from "./types"
+import { findMatchingHooks, executeHookCommand, log } from "../../shared"
+import { DEFAULT_CONFIG } from "./plugin-config"
+import { isHookCommandDisabled, type PluginExtendedConfig } from "./config-loader"
+
+const USER_PROMPT_SUBMIT_TAG_OPEN = "<user-prompt-submit-hook>"
+const USER_PROMPT_SUBMIT_TAG_CLOSE = "</user-prompt-submit-hook>"
+
+export interface MessagePart {
+  type: "text" | "tool_use" | "tool_result"
+  text?: string
+  [key: string]: unknown
+}
+
+export interface UserPromptSubmitContext {
+  sessionId: string
+  parentSessionId?: string
+  prompt: string
+  parts: MessagePart[]
+  cwd: string
+  permissionMode?: "default" | "acceptEdits" | "bypassPermissions"
+}
+
+export interface UserPromptSubmitResult {
+  block: boolean
+  reason?: string
+  modifiedParts: MessagePart[]
+  messages: string[]
+}
+
+export async function executeUserPromptSubmitHooks(
+  ctx: UserPromptSubmitContext,
+  config: ClaudeHooksConfig | null,
+  extendedConfig?: PluginExtendedConfig | null
+): Promise<UserPromptSubmitResult> {
+  const modifiedParts = ctx.parts
+  const messages: string[] = []
+
+  if (ctx.parentSessionId) {
+    return { block: false, modifiedParts, messages }
+  }
+
+  if (
+    ctx.prompt.includes(USER_PROMPT_SUBMIT_TAG_OPEN) &&
+    ctx.prompt.includes(USER_PROMPT_SUBMIT_TAG_CLOSE)
+  ) {
+    return { block: false, modifiedParts, messages }
+  }
+
+  if (!config) {
+    return { block: false, modifiedParts, messages }
+  }
+
+  const matchers = findMatchingHooks(config, "UserPromptSubmit")
+  if (matchers.length === 0) {
+    return { block: false, modifiedParts, messages }
+  }
+
+  const stdinData: UserPromptSubmitInput = {
+    session_id: ctx.sessionId,
+    cwd: ctx.cwd,
+    permission_mode: ctx.permissionMode ?? "bypassPermissions",
+    hook_event_name: "UserPromptSubmit",
+    prompt: ctx.prompt,
+    session: { id: ctx.sessionId },
+    hook_source: "opencode-plugin",
+  }
+
+  for (const matcher of matchers) {
+    for (const hook of matcher.hooks) {
+      if (hook.type !== "command") continue
+
+      if (isHookCommandDisabled("UserPromptSubmit", hook.command, extendedConfig ?? null)) {
+        log("UserPromptSubmit 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 }
+      )
+
+      if (result.stdout) {
+        const output = result.stdout.trim()
+        if (output.startsWith(USER_PROMPT_SUBMIT_TAG_OPEN)) {
+          messages.push(output)
+        } else {
+          messages.push(`${USER_PROMPT_SUBMIT_TAG_OPEN}\n${output}\n${USER_PROMPT_SUBMIT_TAG_CLOSE}`)
+        }
+      }
+
+      if (result.exitCode !== 0) {
+        try {
+          const output = JSON.parse(result.stdout || "{}") as PostToolUseOutput
+          if (output.decision === "block") {
+            return {
+              block: true,
+              reason: output.reason || result.stderr,
+              modifiedParts,
+              messages,
+            }
+          }
+         } catch {
+          // Ignore JSON parse errors
+         }
+      }
+    }
+  }
+
+  return { block: false, modifiedParts, messages }
+}