Document dependency analysis artifacts in AGENTS.md

Added section explaining the analysis/deps/ directory contents:
- graph.json: Raw dependency graph data
- graph.summary.md: Overview metrics and rankings
- sccs.md: Cycle detection results
- layers.observed.md: Layer diagrams
- hotspots.md: Coupling hotspots
- limitations.md: Analysis limitations

Includes key findings from the Euler agent's static analysis.

AGENTS.md

@@ -202,3 +202,25 @@ g3/
 - [Control Commands](docs/CONTROL_COMMANDS.md) - Interactive commands
 - [Code Search](docs/CODE_SEARCH.md) - Tree-sitter search guide
 - [Flock Mode](docs/FLOCK_MODE.md) - Multi-agent development
+
+## Dependency Analysis Artifacts
+
+The `analysis/deps/` directory contains static analysis artifacts generated by the Euler agent:
+
+| File | Purpose |
+|------|--------|
+| `graph.json` | Raw dependency graph data (crate and file-level edges with evidence) |
+| `graph.summary.md` | Overview metrics: crate counts, edge counts, fan-in/fan-out rankings |
+| `sccs.md` | Strongly Connected Components analysis (cycle detection via Tarjan's algorithm) |
+| `layers.observed.md` | Mechanically-derived layer diagram showing crate hierarchy and intra-crate module structure |
+| `hotspots.md` | Coupling hotspots: files/crates with disproportionate fan-in or fan-out (>2× average) |
+| `limitations.md` | Known limitations of the static analysis (conditional compilation, macros, re-exports) |
+
+**Key findings:**
+- No cycles detected at crate or file level (strict DAG structure)
+- `g3-config` and `g3-providers` are the most depended-upon crates (fan-in: 4)
+- `g3-cli` has highest fan-out (5 crate dependencies) as the composition root
+- `ui_writer.rs` is the most imported file (11 dependents)
+- `g3-core/src/lib.rs` has highest fan-out (25 module declarations)
+
+These artifacts are useful for understanding coupling, planning refactors, and identifying architectural boundaries.