feat(adr-017): Implement ruvector integrations in signal crate (partial)

Agents completed three of seven ADR-017 integration points:

1. subcarrier_selection.rs — ruvector-mincut: mincut_subcarrier_partition
   partitions subcarriers into (sensitive, insensitive) groups using
   DynamicMinCut. O(n^1.5 log n) amortized vs O(n log n) static sort.
   Includes test: mincut_partition_separates_high_low.

2. spectrogram.rs — ruvector-attn-mincut: gate_spectrogram applies
   self-attention (Q=K=V) over STFT time frames to suppress noise and
   multipath interference frames. Configurable lambda gating strength.
   Includes tests: preserves shape, finite values.

3. bvp.rs — ruvector-attention stub added (in progress by agent).

4. Cargo.toml — added ruvector-mincut, ruvector-attn-mincut,
   ruvector-temporal-tensor, ruvector-solver, ruvector-attention
   as workspace deps in wifi-densepose-signal crate.

Cargo.lock updated for new dependencies.

Remaining ADR-017 integrations (fresnel.rs, MAT crate) still in
progress via background agents.

https://claude.ai/code/session_01BSBAQJ34SLkiJy4A8SoiL4

.claude-flow/daemon-state.json

@@ -39,13 +39,13 @@
       "isRunning": false
     },
     "testgaps": {
-      "runCount": 26,
+      "runCount": 27,
       "successCount": 0,
-      "failureCount": 26,
+      "failureCount": 27,
       "averageDurationMs": 0,
-      "lastRun": "2026-02-28T15:41:19.031Z",
+      "lastRun": "2026-02-28T16:08:19.369Z",
       "nextRun": "2026-02-28T16:22:19.355Z",
-      "isRunning": true
+      "isRunning": false
     },
     "predict": {
       "runCount": 0,
@@ -131,5 +131,5 @@
       }
     ]
   },
-  "savedAt": "2026-02-28T16:05:19.091Z"
+  "savedAt": "2026-02-28T16:08:19.369Z"
 }