fix: MCP servers — broken INSERT into dropped type column, stale content refs

The previous schema sync (86f43c9) was incomplete — it renamed variables
but left the SQL statements writing to `type` and `content` columns that
no longer exist in the schema. Fresh installs crash on first node create.

nodeService.js:
- Remove `type` from INSERT/UPDATE, replace with `event_date`
- Fix `content` → `notes` in INSERT values and UPDATE SET clauses
- Add `sanitizeTitle()` and chunk fallback logic

sqlite-client.js:
- Remove `is_pinned` from CREATE TABLE
- Add `description` and `icon` to dimensions table

index.js:
- Add temporal filter fields to search schema
- Improved description prompts
- Dynamic date injection in instructions

server.js + stdio-server.js:
- Add content→notes mapping in update handlers
- Fix output returning `notes` instead of `content`
- Add extraction tool schemas and handlers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/mcp-server-standalone/services/sqlite-client.js

@@ -60,8 +60,7 @@ function initDatabase() {
         embedding BLOB,
         embedding_updated_at TEXT,
         embedding_text TEXT,
-        chunk_status TEXT DEFAULT 'not_chunked',
-        is_pinned INTEGER DEFAULT 0
+        chunk_status TEXT DEFAULT 'not_chunked'
       );
 
       CREATE TABLE IF NOT EXISTS edges (
@@ -71,7 +70,6 @@ function initDatabase() {
         source TEXT,
         created_at TEXT,
         context TEXT,
-        
         FOREIGN KEY (from_node_id) REFERENCES nodes(id) ON DELETE CASCADE,
         FOREIGN KEY (to_node_id) REFERENCES nodes(id) ON DELETE CASCADE
       );
@@ -89,6 +87,8 @@ function initDatabase() {
 
       CREATE TABLE IF NOT EXISTS dimensions (
         name TEXT PRIMARY KEY,
+        description TEXT,
+        icon TEXT,
         is_priority INTEGER DEFAULT 0,
         updated_at TEXT DEFAULT CURRENT_TIMESTAMP
       );