Full-featured terminal explorer for the Engram knowledge graph built
natively in El. Features:
- ANSI-colored TUI with box-drawing borders and salience bars
- All API endpoints: stats, nodes by type/tier, search, edges,
spreading activation, node detail with neighbor traversal
- Text report export via fs_write
- Offline/unreachable mode with helpful startup messages
- Interactive mode command reference
- ENGRAM_URL env var for connecting to non-default servers
- Uses json_get_raw for nested JSON object traversal