fix: Update project name when session already exists in createSDKSession

**Problem:**
- Sessions created with empty project names couldn't be updated
- INSERT OR IGNORE skipped updates when session already existed
- Context-hook couldn't find observations (WHERE project = 'claude-mem')
- 364 observations had empty project names

**Root Cause:**
createSDKSession() used INSERT OR IGNORE for idempotency, but never
updated project/prompt fields when session already existed. If SAVE hook
created session first (with empty project), NEW hook couldn't fix it.

**Solution:**
When INSERT is ignored (session exists), UPDATE project and user_prompt
if we have non-empty values. This ensures project name gets set even
when session was created by SAVE hook or with incomplete data.

**Impact:**
- New sessions will always have correct project name
- Backfilled 364 historical observations with project='claude-mem'
- Context injection will now work (finds observations by project)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/hooks/new-hook.ts

@@ -38,6 +38,7 @@ import { stdin } from 'process';
 import { SessionStore } from '../services/sqlite/SessionStore.js';
 import { createHookResponse } from './hook-response.js';
 import { ensureWorkerRunning, getWorkerPort } from '../shared/worker-utils.js';
+import { silentDebug } from '../utils/silent-debug.js';
 
 export interface UserPromptSubmitInput {
   session_id: string;
@@ -55,8 +56,27 @@ async function newHook(input?: UserPromptSubmitInput): Promise<void> {
   }
 
   const { session_id, cwd, prompt } = input;
+
+  // Debug: Log what we received
+  silentDebug('[new-hook] Input received', {
+    session_id,
+    cwd,
+    cwd_type: typeof cwd,
+    cwd_length: cwd?.length,
+    has_cwd: !!cwd,
+    prompt_length: prompt?.length
+  });
+
   const project = path.basename(cwd);
 
+  silentDebug('[new-hook] Project extracted', {
+    project,
+    project_type: typeof project,
+    project_length: project?.length,
+    is_empty: project === '',
+    cwd_was: cwd
+  });
+
   // Ensure worker is running
   await ensureWorkerRunning();