chore: commit current DB and add SQL dump export/import scripts

Include data/drafts.db so other machines don't need to re-run
expensive Claude API calls (~$3+ of analysis, 474 drafts, 403 authors,
1262 ideas, 12 gaps). Add scripts/db-export.sh and scripts/db-import.sh
for portable compressed SQL dump sharing.

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

scripts/db-import.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Import SQL dump into drafts.db, replacing existing data.
+# Usage: scripts/db-import.sh [input_path]
+
+set -euo pipefail
+
+DB="data/drafts.db"
+IN="${1:-data/drafts.sql.gz}"
+
+if [[ ! -f "$IN" ]]; then
+    echo "Error: $IN not found" >&2
+    exit 1
+fi
+
+if [[ -f "$DB" ]]; then
+    BACKUP="data/drafts.db.bak.$(date +%s)"
+    echo "Backing up existing DB → $BACKUP"
+    cp "$DB" "$BACKUP"
+    rm "$DB"
+fi
+
+echo "Importing $IN → $DB"
+gunzip -c "$IN" | sqlite3 "$DB"
+
+ROWS=$(sqlite3 "$DB" "SELECT count(*) FROM drafts;")
+echo "Done: $ROWS drafts restored"