chore: initial standalone module import

CHANGELOG.md

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+# Changelog
+
+All notable changes to `mod-gold-rush` will be documented in this file.
+
+## [Unreleased]
+
+### Added
+- Standalone repository documentation in `README.md`.
+- Initial `CHANGELOG.md` for tracking module releases.
+
+### Changed
+- Loosened Gold Rush hotspot selection so events can fall back to eligible
+  live-player zones when configured hotspots are unavailable.
+- Improved GM messaging for zone eligibility failures.
+- Allowed zone-based fallback when an exact configured sub-area anchor is not
+  available.
+
+### Fixed
+- Fixed `GoldRush.NodeEntries` parsing so configured node IDs are actually
+  loaded from `gold_rush.conf`.
+- Fixed startup behavior where Gold Rush could appear to have no valid node
+  entries even when configuration values were present.
+- Fixed `teststart` and scheduler flows that were overly strict about allowed
+  zones.