Add Remediate workflow type to Ivanti Queue with remediation notes

- Add 'Remediate' as a valid workflow type (vendor-required, like FP/Archer)
- Create queue_remediation_notes table with FK cascade and 5000 char limit
- Add POST/GET /api/ivanti/todo-queue/:id/notes endpoints
- Include remediation_notes_count in queue item GET response
- Add RemediationModal component for viewing/adding notes
- Add notes count badge on Remediate queue items (purple #A855F7 theme)
- Add delete confirmation warning when removing items with notes
- Append remediation notes to Jira ticket descriptions
- Add property-based tests for all correctness properties

backend/migrations/add_queue_remediation_notes_table.js

@@ -0,0 +1,49 @@
+// Migration: Create queue_remediation_notes table
+// Stores remediation notes for Ivanti todo queue items (append-only).
+// FK cascade ensures notes are deleted when the parent queue item is removed.
+// Idempotent — safe to re-run multiple times.
+const pool = require('../db');
+
+async function run() {
+    console.log('Starting queue_remediation_notes migration...');
+
+    // Verify prerequisite table exists
+    const { rows: queueTable } = await pool.query(`
+        SELECT 1 FROM information_schema.tables
+        WHERE table_schema = 'public' AND table_name = 'ivanti_todo_queue'
+    `);
+    if (queueTable.length === 0) {
+        console.error('✗ ivanti_todo_queue table does not exist. Cannot proceed.');
+        process.exit(1);
+    }
+    console.log('✓ ivanti_todo_queue table exists');
+
+    // Create queue_remediation_notes table
+    await pool.query(`
+        CREATE TABLE IF NOT EXISTS queue_remediation_notes (
+            id SERIAL PRIMARY KEY,
+            queue_item_id INTEGER NOT NULL REFERENCES ivanti_todo_queue(id) ON DELETE CASCADE,
+            user_id INTEGER NOT NULL,
+            username VARCHAR(100) NOT NULL,
+            note_text TEXT NOT NULL,
+            created_at TIMESTAMPTZ DEFAULT NOW(),
+            CONSTRAINT chk_note_text_length CHECK (char_length(note_text) <= 5000)
+        )
+    `);
+    console.log('✓ queue_remediation_notes table created (or already exists)');
+
+    // Create index on queue_item_id for efficient lookup
+    await pool.query(`
+        CREATE INDEX IF NOT EXISTS idx_remediation_notes_queue_item
+        ON queue_remediation_notes(queue_item_id)
+    `);
+    console.log('✓ queue_item_id index created (or already exists)');
+
+    console.log('Migration complete.');
+    process.exit(0);
+}
+
+run().catch(err => {
+    console.error('Migration failed:', err.message);
+    process.exit(1);
+});