feat(db): add atlas Rust CLI for celestial bodies + stations

Rust binary (server/src/bin/atlas.rs) with commands: show-system,
show-body, show-station, list-bodies, list-stations, add-body,
add-station, stats, populate. Reads from server/data/systems.db.

Wrapper at tooling/atlas, skill at .claude/skills/atlas/SKILL.md.
Scope note: atlas will grow to cover the full geographic hierarchy
(planetary surfaces, settlements, districts) as the cascade progresses.

Also: removed stale star_systems table from settledreach.db (belongs
in systems.db only) and ran initial populate pass (329 bodies + 301
horizon stations across 301 systems).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/atlas/SKILL.md

@@ -0,0 +1,143 @@
+---
+name: atlas
+description: >
+  Query and manage celestial bodies and stations in systems.db. Use when the user
+  says "atlas", "show system", "list bodies", "list stations", "populate bodies",
+  "show body", or invokes /atlas. Wraps the Rust atlas CLI binary.
+user-invocable: true
+allowed-tools: Bash, Read, Grep, Glob
+---
+
+# Atlas Skill
+
+Query and manage celestial bodies (planets, moons, gas giants, asteroid belts,
+oort clouds) and stations in `server/data/systems.db`.
+
+**CLI binary:** `tooling/atlas` (wraps `cargo run --bin atlas`)
+**Database:** `server/data/systems.db` (auto-detected from working directory)
+**All output is JSON on stdout.**
+
+## Commands
+
+### Show full system hierarchy
+```bash
+tooling/atlas show-system "GJ 15A"
+```
+Returns: system info + all bodies + all stations in the system.
+
+### Show a single body
+```bash
+tooling/atlas show-body "GJ15Ab"
+```
+Returns: body details + stations orbiting that body.
+
+### Show a single station
+```bash
+tooling/atlas show-station "GJ15Ab-S1"
+```
+
+### List bodies with filters
+```bash
+tooling/atlas list-bodies
+tooling/atlas list-bodies --system "GJ 15A"
+tooling/atlas list-bodies --type planet
+tooling/atlas list-bodies --type planet --inhabited
+tooling/atlas list-bodies --unnamed
+```
+Types: `planet`, `moon`, `gas_giant`, `asteroid_belt`, `oort_cloud`
+
+### List stations with filters
+```bash
+tooling/atlas list-stations
+tooling/atlas list-stations --system "GJ 15A"
+tooling/atlas list-stations --type horizon
+```
+Types: `horizon`, `commercial`, `military`, `research`, `industrial`, `agricultural`, `transit`
+
+### Add a body
+```bash
+tooling/atlas add-body \
+  --id "GJ15Ab" \
+  --system "GJ 15A" \
+  --type planet \
+  --orbit 1 \
+  --name "Xin Chengdu" \
+  --mass-class terrestrial \
+  --atmosphere breathable \
+  --gravity 0.87 \
+  --biome temperate \
+  --inhabited \
+  --population 1800000
+```
+
+### Add a station
+```bash
+tooling/atlas add-station \
+  --id "GJ15Ab-S1" \
+  --system "GJ 15A" \
+  --orbits "GJ15Ab" \
+  --type commercial \
+  --name "Chengdu Orbital" \
+  --population 420000 \
+  --docking major
+```
+
+### Database statistics
+```bash
+tooling/atlas stats
+```
+Returns: system count, body count by type, inhabited count, station count by type.
+
+### Bulk populate from system data (classifier pass)
+```bash
+tooling/atlas populate --dry-run   # preview what would be created
+tooling/atlas populate              # create body/station records
+```
+Reads `habitable_planet_count`, `inhabited_planet_count`, `gas_giant`,
+`asteroid_belt`, and `horizon_station` from existing system data.
+Creates: planets (inhabited first), gas giants, asteroid belts, oort cloud per
+system, horizon station per oort cloud. Skips systems that already have bodies.
+
+## Body ID Naming Convention
+
+```
+GJ-{n}          — star (single)
+GJ-{n}A         — primary star (binary)
+GJ-{n}B         — secondary star (binary)
+GJ-{n}b/c/d...  — planets, innermost first
+GJ-{n}Ab/c/d... — planets orbiting primary only
+GJ-{n}Bb/c/d... — planets orbiting secondary only
+GJ-{n}d-1       — first moon of third planet
+GJ-{n}d-S1      — first station orbiting third planet
+GJ-{n}-oort     — oort cloud region
+GJ-{n}-belt     — asteroid belt
+GJ-{n}-oort-S1  — horizon station in oort cloud
+```
+
+## Entity Hierarchy
+
+```
+System (star_systems)
+  └─ Body (bodies) — planet, moon, gas_giant, asteroid_belt, oort_cloud
+       └─ Station (stations) — horizon, commercial, military, research, etc.
+```
+
+Bodies have a self-referential `parent_body_id` for moons → planet relationships.
+Stations reference `orbits_body_id` for what they orbit.
+
+## Scope — A True Atlas
+
+This skill will grow to cover the full geographic hierarchy of the Reach:
+
+- **Galactic:** 301 systems, gate topology, sector/corridor data
+- **System:** orbital bodies, stations, oort cloud
+- **Planetary surface:** continents, oceans, mountain ranges, rivers, biome regions
+- **Settlement:** cities, towns, villages, outposts, rail lines, road hierarchy
+- **District:** neighborhoods, zones, named areas/provinces
+- **Local:** named locations, landmarks, facilities
+
+As the development cascade progresses through Phase 1 (wiki content) → Phase 3
+(planetary maps / Atlas of the Reach), the atlas CLI and its schema will extend
+to cover each level. The goal is a single queryable geographic database from
+galaxy scale to street level — the in-game implant's atlas app reads from this
+same data.