feat(train): Add ruvector integration — ADR-016, deps, DynamicPersonMatcher

- docs/adr/ADR-016: Full ruvector integration ADR with verified API details
  from source inspection (github.com/ruvnet/ruvector). Covers mincut,
  attn-mincut, temporal-tensor, solver, and attention at v2.0.4.
- Cargo.toml: Add ruvector-mincut, ruvector-attn-mincut, ruvector-temporal-
  tensor, ruvector-solver, ruvector-attention = "2.0.4" to workspace deps
  and wifi-densepose-train crate deps.
- metrics.rs: Add DynamicPersonMatcher wrapping ruvector_mincut::DynamicMinCut
  for subpolynomial O(n^1.5 log n) multi-frame person tracking; adds
  assignment_mincut() public entry point.
- proof.rs, trainer.rs, model.rs, dataset.rs, subcarrier.rs: Agent
  improvements to full implementations (loss decrease verification, SHA-256
  hash, LCG shuffle, ResNet18 backbone, MmFiDataset, linear interp).
- tests: test_config, test_dataset, test_metrics, test_proof, training_bench
  all added/updated. 100+ tests pass with no-default-features.

https://claude.ai/code/session_01BSBAQJ34SLkiJy4A8SoiL4

rust-port/wifi-densepose-rs/Cargo.toml

@@ -99,9 +99,12 @@ proptest = "1.4"
 mockall = "0.12"
 wiremock = "0.5"
 
-# ruvector integration
-# ruvector-core = "0.1"
-# ruvector-data-framework = "0.1"
+# ruvector integration (all at v2.0.4 — published on crates.io)
+ruvector-mincut = "2.0.4"
+ruvector-attn-mincut = "2.0.4"
+ruvector-temporal-tensor = "2.0.4"
+ruvector-solver = "2.0.4"
+ruvector-attention = "2.0.4"
 
 # Internal crates
 wifi-densepose-core = { path = "crates/wifi-densepose-core" }