fix(country-map): CI failures — license headers, lockfile sync, reproducible build

Three coordinated fixes for the 25 CI failures on the initial PR push:

1. **Lockfile sync.** Added @superset-ui/plugin-chart-country-map as
   a workspace dep in the previous commit but didn't update
   package-lock.json. CI's `npm ci` failed across frontend-build,
   cypress (12 jobs), playwright (4 jobs), docker (2 jobs), and
   frontend-check-translations. Re-ran `npm install --package-lock-only`
   to add the new workspace's 71 lock entries.

2. **License headers added** to 13 new files flagged by License Check:
   - 5 markdown READMEs / SIP_DRAFT (HTML-comment headers)
   - 5 YAML config files (`# Licensed ...`)
   - 2 Python files (`# Licensed ...`)
   - 1 shell script (preserves shebang)

3. **Reproducible build outputs.** The regen workflow detected drift
   on manifest.json + ukr_admin1_CAN.geo.json. Two root causes:
   - `build_timestamp_utc` field made manifest non-deterministic →
     dropped from the schema
   - Floating mapshaper version (`npx --yes mapshaper`) caused subtle
     simplification differences across runners → pinned to
     `mapshaper@0.7.15` via `npx --yes mapshaper@<version>`

Verified locally: rebuild from clean cache reproduces every output
byte-identically except the manifest (which now also matches once
the timestamp is gone).

Files changed:
  .gitignore                           — re-include rule for static dir
  superset-frontend/package-lock.json  — +71 lines for new workspace
  13 new files                         — ASF headers
  build.py                             — pin mapshaper, drop timestamp
  manifest.json (× 2)                  — regenerate w/o timestamp
  README.md (in static dir)            — header

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

superset-frontend/plugins/plugin-chart-country-map/scripts/test_build.py

@@ -1,4 +1,21 @@
 #!/usr/bin/env python3
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
 """
 Unit tests for the Country Map build pipeline transforms.