chore: sync codebase remediation, gameplay systems, and docs

Security & infrastructure:
- Remove unused services/ (auth, spacetimedb) and auth.db
- Add .env.example template, expand .gitignore for env/db files
- Add GitHub Actions CI + commitlint config and workflows
- Add manual vendor chunking and source maps to docs/site vite configs

Shared UI & docs app:
- Add ARIA props and focus-visible rings to Button/Panel
- Add ButtonAsLink primitive; use shared Button in NotFound
- Wire @void-nav/ui into docs app; refresh content pages
- Replace Todo page with Kanban board

Gameplay (Bevy):
- Add ai module (behavior, faction, navigation, perception, spawning, states)
- Add narrative module (events, history, synthesis, ui)
- Refine galaxy contents and in-system flight/scene systems

.gitignore

@@ -8,13 +8,33 @@ coverage/
 .parcel-cache/
 .cache/
 .DS_Store
+
+# Environment files (never commit these)
 .env
 .env.local
 .env.*.local
+
+# SpacetimeDB
 spacetime.local.json
+.spacetime-dev/
+
+# TypeScript
 *.tsbuildinfo
 vite.config.js
 vite.config.d.ts
+
+# Playwright
 .playwright-mcp/
-.spacetime-dev/
+
+# Rust
 target/
+
+# Database files (SQLite, SpacetimeDB, etc.)
+*.db
+*.db-shm
+*.db-wal
+*.sqlite
+*.sqlite3
+
+# CI/CD local testing
+.github/workflows/.local*