Add workflow-status telemetry view and make panel modes on-demand

Workflow-status: a new WorkflowProgressTracker singleton taps the
suppressed dynamic-workflow subagent events (those carrying
parent_tool_use_id) into per-session telemetry without altering the
existing guard; the snapshot is serialized into the new chains.workflow_info
column on FinalizeChain (ChainId-matched so a panel member of the same
session cannot clear it) and exposed via GET /api/sessions/{id}/workflow-status
(live -> persisted -> none). The header menu gains a 'Workflow-Status' entry
with a modal that live-polls every 2s while running and self-stops on close.

Panel on-demand: Fusion/MoA is now a transient per-request multiModelMode
flag (like plan/ultracode) instead of a persisted session column. Session
settings keep only the panel members + moa_layers; the mode <select> was
removed and the composer dropdown drives the mode per request.

Docs: ARCHITECTURE.md, ARCHITECTURE_QUICK.md and README.md updated for both
features plus the already-shipped z.ai/GLM provider, GLM 5.2+ effort
passthrough, web-search-prime MCP and the ultracode toggle.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

wwwroot/css/chat.css

@@ -1003,6 +1003,92 @@
   border: var(--border-width) solid var(--f2-border);
 }
 
+/* Workflow-Status Modal (Ultracode) */
+
+.workflow-status-modal {
+  max-width: 540px;
+}
+
+.wf-status-head {
+  display: flex;
+  align-items: center;
+  gap: var(--badge-spacing);
+  font-weight: 600;
+  margin-bottom: var(--box-spacing);
+}
+
+.wf-status-head.wf-running { color: var(--info); }
+.wf-status-head.wf-done { color: var(--secondary); }
+.wf-status-head.wf-none { color: var(--text); opacity: var(--semi-transparent); }
+
+.wf-empty {
+  opacity: var(--semi-transparent);
+}
+
+.wf-stat-grid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: var(--badge-spacing);
+}
+
+.wf-stat {
+  padding: var(--box-padding);
+  background: var(--f3-bg);
+  border-radius: var(--border-radius);
+  border: var(--border-width) solid var(--f2-border);
+  text-align: center;
+}
+
+.wf-stat-val {
+  font-family: var(--mono);
+  font-size: 1.3em;
+  color: var(--text-accent);
+}
+
+.wf-stat-lbl {
+  font-size: .85em;
+  opacity: var(--semi-transparent);
+  margin-top: .2em;
+}
+
+.wf-section {
+  margin-top: var(--box-spacing);
+}
+
+.wf-section-lbl {
+  font-weight: 600;
+  margin-bottom: var(--badge-spacing);
+}
+
+.wf-tool-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--border-width);
+}
+
+.wf-tool-row {
+  display: flex;
+  justify-content: space-between;
+  padding: .35em var(--badge-spacing);
+  background: var(--f3-bg);
+  border-radius: var(--border-radius);
+}
+
+.wf-tool-name {
+  font-family: var(--mono);
+}
+
+.wf-tool-count {
+  color: var(--primary);
+  font-family: var(--mono);
+}
+
+.wf-meta {
+  margin-top: var(--box-spacing);
+  font-size: .85em;
+  opacity: var(--semi-transparent);
+}
+
 /* Command Output Modal */
 
 .cmd-output-modal {