chore: import upstream snapshot with attribution

.github/pull_request_template.md

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+## Summary
+
+- TBD
+
+## Scope
+
+- [ ] This PR is focused on one logical change.
+- [ ] I did not commit runtime outputs, local credentials, `.god/`, `.live/`, `.DS_Store`, `promos/`, `docs/press-kit/`, or local-only large map assets.
+- [ ] If this PR changes public docs, both English and Chinese docs were updated where applicable.
+- [ ] If this PR changes maps or experiments, the added assets are intentionally part of the public repository.
+
+## Validation
+
+- [ ] `bash -n scripts/god.sh`
+- [ ] `npm run build --prefix agentsociety/frontend`
+- [ ] `cd agentsociety && uv run pytest -q packages/agentsociety2/tests/test_god_setup_router.py packages/agentsociety2/tests/test_map_packages.py packages/agentsociety2/tests/test_pixel_town_social_env.py`
+- [ ] Map package validation, if applicable: `cd agentsociety && uv run python scripts/validate_map_package.py custom/maps/<map_id>`
+
+## Screenshots / Clips
+
+Add screenshots or short clips for UI, replay, map, setup, or docs changes.