feat(tooling): add --help/-h to sqlite-query and sqlite-exec (#722)

Both wrappers previously silently treated --help as a SQL comment and
returned empty result JSON. They now intercept --help/-h before
delegating to the Python connector and print proper usage text with
the correct JSON key names (affected_rows, not rows_affected).

ticket, sprint, and decision already supported --help — no change.

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

tooling/db/sqlite-exec

@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Run an INSERT/UPDATE/DELETE on the ticketing database. Whitelistable command.
 # Usage: sqlite-exec "UPDATE tickets SET status='done' WHERE id=1"
+if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
+  echo "Usage: sqlite-exec <SQL>"
+  echo ""
+  echo "Run an INSERT, UPDATE, or DELETE on the ticketing database."
+  echo "Output is JSON: {\"ok\": true, \"affected_rows\": N}"
+  echo ""
+  echo "Examples:"
+  echo "  sqlite-exec \"UPDATE tickets SET status='done' WHERE id=42\""
+  echo "  sqlite-exec \"UPDATE tickets SET assigned_to='stig' WHERE id=844\""
+  exit 0
+fi
 exec python3 "$(dirname "$0")/sqlite_connector.py" execute "$@"