feat(FN-2925): merge fusion/fn-2925

- Mobile header row polish: finalize QuickChatFAB CSS for mobile viewport handling, apply visual viewport height to quick chat panel, remove duplicate keyboard overlap subtraction
- Add `node-routing-policy.ts` with routing logic for mesh network nodes; expand scheduler node-routing tests with new policy coverage
- Improve reviewer decision logic and add reviewer test cases for changed behavior
- Refactor triage module (48 lines changed) with updated agent selection logic
- Update `AgentsView` component and styles; add `AgentsView.test.tsx` integration test
- Simplify `QuickChatFAB.test.tsx` test by removing CSS class permutation coverage
- Update architecture docs and settings reference to reflect new routing capabilities

Commits merged:
- fix(FN-2925): remove duplicate keyboard overlap subtraction
- feat(FN-2925): complete Step 5 — finalize mobile header row polish
- fix(FN-2925): apply visual viewport height to mobile quick chat panel
- feat(FN-2903): merge fusion/fn-2903
- feat(FN-2950): merge fusion/fn-2950

Files changed:
docs/architecture.md                               |  19 +--
 docs/settings-reference.md                         |   2 +-
 packages/dashboard/app/components/AgentsView.css   |  20 +++-
 packages/dashboard/app/components/AgentsView.tsx   |  11 +-
 packages/dashboard/app/components/QuickChatFAB.css |  32 ++++-
 .../dashboard/app/components/SettingsModal.tsx     |   4 +-
 .../app/components/__tests__/AgentsView.test.tsx   |  37 ++++++
 .../app/components/__tests__/QuickChatFAB.test.tsx |  18 +--
 .../src/__tests__/node-routing-policy.test.ts      |  78 ++++++++++++
 packages/engine/src/__tests__/reviewer.test.ts     |  19 ++-
 .../src/__tests__/scheduler-node-routing.test.ts   | 131 ++++++++++++++++++++-
 packages/engine/src/__tests__/triage.test.ts       |  16 +--
 packages/engine/src/node-routing-policy.ts         |  45 +++++++
 packages/engine/src/reviewer.ts                    |  33 ++++--
 packages/engine/src/scheduler.ts                   |  44 ++++++-
 packages/engine/src/triage.ts                      |  48 ++++----
 16 files changed, 473 insertions(+), 84 deletions(-)

Fusion-Task-Id: FN-2925

packages/dashboard/app/components/SettingsModal.css

@@ -556,6 +556,27 @@
   --status-color: var(--text-muted);
 }
 
+.remote-share-block {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  margin: 0 var(--space-xl) var(--space-md);
+  padding: var(--space-sm) var(--space-md);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  background: color-mix(in srgb, var(--text-muted) 5%, transparent);
+}
+
+.remote-share-row {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xs);
+}
+
+.remote-share-row .settings-qr-preview-image {
+  margin-top: var(--space-xs);
+}
+
 .remote-status-dot {
   width: var(--space-sm);
   height: var(--space-sm);