feat(topology): cm-topology crate + architecture doc (Phases 0–1)

Foundation for the dynamic agentic-topologies platform (see
docs/topology-platform.md), porting agentorg's topology modeling into pure Rust:

- TopologyKind: curated 12-kind taxonomy (hierarchical, flat, pipeline, swarm,
  mesh, hub_spoke, ring, star_moe, market, blackboard, debate, holacratic).
- TopologyGraph: role-slot nodes + typed edges, with validation.
- adapter: normalize a loose JSON spec → validated graph (fills edge kinds).
- classifier: structural metrics (density, hub dominance, clustering, diameter,
  hierarchy score) → inferred kind + confidence (tree→hierarchical, line→pipeline,
  cycle→ring, star→hub_spoke, complete→mesh, empty→flat).
- heuristics: per-kind role distributions (ported from topology_manager.py).

Pure, offline, dependency-light (serde/thiserror). 17 unit tests, clippy clean.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

crates/cm-topology/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "cm-topology"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+
+[lints]
+workspace = true