Add offline resource capability discovery

docs/roadmap.md

@@ -132,6 +132,16 @@ For deployment-readiness work that cuts across feature areas, see
   - `[x]` Tests and automation documentation define the single-document and
     line-oriented contracts.
 
+- `[x]` Make resource and capability vocabulary discoverable offline.
+  Acceptance criteria:
+  - `[x]` `geth resource capabilities [family]` lists exact resource ID
+    patterns, capability strings, and important operations or host effects.
+  - `[x]` Discovery works before initialization and without a running daemon,
+    and explicitly states that viewing the catalog does not grant access.
+  - `[x]` Human, JSON, and JSONL forms include a copy-paste grant template.
+  - `[x]` Tests cover the full catalog, family filtering, common aliases, and
+    unknown-family recovery.
+
 - `[ ]` Publish copy-paste installation entrypoints for release artifacts.
   Acceptance criteria:
   - `[ ]` Linux, macOS, and Windows installation instructions verify artifact