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Add star-map Angular app, ETL pipeline, and caveman plugin

Angular 3D star map (galaxy/system/body views, Three.js rendering,
navigation store) plus the NASA ETL tooling that builds the star,
exoplanet and solar-system datasets, Playwright e2e suite, and the
cs:caveman Claude Code plugin (command, agent, skill).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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README.md

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-# star-map
+# star-map
+
+Personal marketplace of `cs:*` Claude Code commands, agents, and skills.
+
+## Install (global — works in every project)
+
+This repo is a Claude Code plugin marketplace. Adding it and installing a
+plugin defaults to **user scope**, meaning the plugin becomes available in
+*every* project on your machine, not just the one you happen to be in:
+
+```bash
+/plugin marketplace add avalon-vanguard/star-map
+/plugin install caveman@star-map
+```
+
+Scope can be overridden at install time if you want it tied to a single
+repo instead:
+
+```bash
+# Shared with collaborators via that repo's .claude/settings.json
+/plugin install caveman@star-map --scope project
+
+# Just for you, in that one repo only (gitignored)
+/plugin install caveman@star-map --scope local
+```
+
+See [Claude Code plugin installation scopes](https://code.claude.com/docs/en/plugins-reference)
+for details on `user` / `project` / `local` scope.
+
+## Plugins
+
+- **caveman** — `/cs:caveman` ultra-compressed communication mode.
+  - Command: [`commands/cs/caveman.md`](commands/cs/caveman.md)
+  - Agent: [`agents/cs-caveman-mode.md`](agents/cs-caveman-mode.md)
+  - Skill: [`skills/caveman/SKILL.md`](skills/caveman/SKILL.md)