feat(ultracode): master-detail tab for Workflow/ultracode run visualization

Opt-in (showUltracodeAgents, default OFF) panel that visualizes ultracode /
Workflow-tool runs like Claude Code's "working agents" TUI: LEFT = runs + phases
(selectable tasks), RIGHT = each run's agents with model, live state, tokens
burned, and tool calls.

Standalone — ZERO edits to subagent-watcher.ts. A new workflow-run-watcher.ts
singleton globs the run-state tree (~/.claude/projects/*/*/workflows/wf_*.json,
disjoint from the transcript tree), strips the heavy script/scriptPath/result/logs
fields (174KB -> ~25KB/run), and emits workflow:run_* SSE events. The LEFT list
ships lightweight summaries (getLightState replay + SSE); the RIGHT pane fetches
the full run (with agents[]) via GET /api/workflows/:runId on selection.

Backend: workflow-run-watcher.ts, types/workflow-run.ts, config/workflow-config.ts,
3 SSE events, getLightState workflowRuns replay, GET /api/workflows[/:runId],
showUltracodeAgents schema key + boot-gate (default OFF) + live toggleService.
Frontend: ultracode-panel.js (debounced master-detail render, run/phase select),
header launcher (btn-ultracode-agents--hidden marker -> mobile-guard-exempt),
App Settings toggle (SYNCED, deliberately not in displayKeys).

Agent states on disk are start|progress|done (start=queued; done has
durationMs/resultPreview). Tests: workflow-run-watcher (9), workflow-routes (3).
Verified: tsc/lint/prettier/frontend-syntax/public-assets/mobile-header-guard
clean; full test:ci green (2986 passed); live server + Playwright e2e against 25
real runs (28-agent grid, phase filter, OFF hides launcher).

Design: docs/ultracode-agent-viz-plan.md (rev. 3).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/web/sse-events.ts

@@ -15,6 +15,7 @@
  * - **Mux** (4): created, killed, died, statsUpdated
  * - **Respawn** (24): stateChanged, cycleStarted/Completed, step*, aiCheck*, planCheck*, timer*, log, ...
  * - **Subagents** (7): discovered, updated, tool_call, tool_result, progress, message, completed
+ * - **Workflow runs** (3): run_discovered, run_updated, run_removed (ultracode / Workflow tool)
  * - **Scheduled** (6): created, updated, completed, stopped, log, deleted
  * - **Teams** (4): created, updated, removed, taskUpdated
  * - **Transcript** (4): complete, plan_mode, tool_start, tool_end
@@ -215,6 +216,15 @@ export const SubagentMessage = 'subagent:message' as const;
 /** Subagent finished. */
 export const SubagentCompleted = 'subagent:completed' as const;
 
+// ─── Workflow Runs (ultracode / Workflow tool) ───────────────────────────────
+
+/** A workflow run was discovered (first time seen). Payload: WorkflowRunInfo. */
+export const WorkflowRunDiscovered = 'workflow:run_discovered' as const;
+/** A workflow run changed (agent state/token tick). Payload: WorkflowRunInfo. */
+export const WorkflowRunUpdated = 'workflow:run_updated' as const;
+/** A workflow run's file disappeared. Payload: { runId: string }. */
+export const WorkflowRunRemoved = 'workflow:run_removed' as const;
+
 // ─── Scheduled Runs ──────────────────────────────────────────────────────────
 
 /** Scheduled run created. */
@@ -446,6 +456,11 @@ export const SseEvent = {
   SubagentMessage,
   SubagentCompleted,
 
+  // Workflow runs (ultracode)
+  WorkflowRunDiscovered,
+  WorkflowRunUpdated,
+  WorkflowRunRemoved,
+
   // Scheduled runs
   ScheduledCreated,
   ScheduledUpdated,