Refactor code structure for improved readability and maintainability

docs/plans/phase0-task1-summary.md

@@ -0,0 +1,165 @@
+# Phase 0 Task 1: Add Comprehensive Logging to Summary Hook
+
+## Overview
+Added comprehensive logging to the Stop hook (summary hook) to verify it fires on normal exit and successfully sends the FINALIZE message to the worker socket.
+
+## Files Modified
+
+### `/Users/alexnewman/Scripts/claude-mem/src/hooks/summary.ts`
+Added 8 logging points throughout the hook execution flow.
+
+## Logging Points Added
+
+All logs use the `[claude-mem summary]` prefix for easy searching and use `console.error()` to output to stderr (visible in terminal).
+
+### 1. Hook Entry Point (Line 18-20)
+```typescript
+console.error('[claude-mem summary] Hook fired', {
+  input: input ? { session_id: input.session_id, cwd: input.cwd } : null
+});
+```
+**Purpose:** Confirms the hook was called by Claude Code and logs the input parameters.
+
+### 2. Session Search (Line 34)
+```typescript
+console.error('[claude-mem summary] Searching for active SDK session', { session_id });
+```
+**Purpose:** Logs the session_id being searched for in the database.
+
+### 3. Session Not Found (Line 43)
+```typescript
+console.error('[claude-mem summary] No active SDK session found', { session_id });
+```
+**Purpose:** Logs when no active session is found (normal for non-SDK sessions).
+
+### 4. Session Found (Line 48-52)
+```typescript
+console.error('[claude-mem summary] Active SDK session found', {
+  session_id: session.id,
+  collection_name: session.collection_name,
+  worker_pid: session.worker_pid
+});
+```
+**Purpose:** Logs when an active session is found with its details for verification.
+
+### 5. Before Socket Send (Line 62-65)
+```typescript
+console.error('[claude-mem summary] Attempting to send FINALIZE message to worker socket', {
+  socketPath,
+  message
+});
+```
+**Purpose:** Logs the socket path and message content before attempting connection.
+
+### 6. Socket Connection Established (Line 68)
+```typescript
+console.error('[claude-mem summary] Socket connection established, sending message');
+```
+**Purpose:** Confirms successful socket connection before writing data.
+
+### 7. Socket Error Handler (Line 75-79)
+```typescript
+console.error('[claude-mem summary] Socket error occurred', {
+  error: err.message,
+  code: (err as any).code,
+  socketPath
+});
+```
+**Purpose:** Logs detailed error information if socket connection fails (includes error code like ENOENT, ECONNREFUSED).
+
+### 8. Socket Close Handler (Line 84)
+```typescript
+console.error('[claude-mem summary] Socket connection closed successfully');
+```
+**Purpose:** Confirms the socket connection closed cleanly after sending message.
+
+### 9. Catch Block (Line 91-95)
+```typescript
+console.error('[claude-mem summary] Unexpected error in hook', {
+  error: error.message,
+  stack: error.stack,
+  name: error.name
+});
+```
+**Purpose:** Logs any unexpected errors with full stack trace for debugging.
+
+## How to Test
+
+### Basic Test (Normal Exit)
+1. Start a Claude Code session in a project with claude-mem configured
+2. Have a conversation that triggers SDK memory operations
+3. Exit Claude Code normally (Ctrl+D or type "exit")
+4. Check terminal stderr for log sequence:
+   ```
+   [claude-mem summary] Hook fired
+   [claude-mem summary] Searching for active SDK session
+   [claude-mem summary] Active SDK session found
+   [claude-mem summary] Attempting to send FINALIZE message to worker socket
+   [claude-mem summary] Socket connection established, sending message
+   [claude-mem summary] Socket connection closed successfully
+   ```
+
+### Test Cases
+
+#### Case 1: Normal Exit with Active Session
+**Expected logs:**
+1. Hook fired (with session_id and cwd)
+2. Searching for active SDK session
+3. Active SDK session found (with session details)
+4. Attempting to send FINALIZE message (with socket path)
+5. Socket connection established
+6. Socket connection closed successfully
+
+#### Case 2: Exit with No Active Session
+**Expected logs:**
+1. Hook fired
+2. Searching for active SDK session
+3. No active SDK session found
+
+#### Case 3: Worker Socket Already Closed
+**Expected logs:**
+1. Hook fired
+2. Searching for active SDK session
+3. Active SDK session found
+4. Attempting to send FINALIZE message
+5. Socket error occurred (with ENOENT or ECONNREFUSED code)
+
+#### Case 4: Database Error
+**Expected logs:**
+1. Hook fired
+2. Searching for active SDK session
+3. Unexpected error in hook (with stack trace)
+
+### Log Filtering
+To view only summary hook logs:
+```bash
+claude-code 2>&1 | grep "\[claude-mem summary\]"
+```
+
+## Behavior Guarantees
+
+1. **No Breaking Changes:** All existing functionality remains identical
+2. **Non-Blocking:** All errors are caught and logged but don't block Claude Code
+3. **Clean Exit:** Hook always returns proper JSON response to Claude Code
+4. **Searchable:** All logs use consistent `[claude-mem summary]` prefix
+
+## Issues and Concerns
+
+### None Discovered
+- The existing error handling is robust
+- All error paths properly log and exit gracefully
+- No changes needed to logic, only observability added
+
+### Potential Observations During Testing
+- If socket errors are common, may indicate worker timing issues
+- If "No active SDK session found" appears frequently, may indicate database query issues
+- If hook never fires, indicates Claude Code hook registration problem
+- If socket path is wrong, indicates paths.ts configuration issue
+
+## Next Steps
+
+After testing with these logs:
+1. Verify hook fires on every Claude Code exit
+2. Verify FINALIZE message reaches worker socket
+3. Check for any unexpected error patterns
+4. Use logs to diagnose any issues with worker finalization flow