feat(health): configurable per-project stall threshold

v2/src/lib/components/Workspace/ProjectBox.svelte

@@ -12,7 +12,7 @@
   import SshTab from './SshTab.svelte';
   import MemoriesTab from './MemoriesTab.svelte';
   import { getTerminalTabs } from '../../stores/workspace.svelte';
-  import { getProjectHealth } from '../../stores/health.svelte';
+  import { getProjectHealth, setStallThreshold } from '../../stores/health.svelte';
   import { fsWatchProject, fsUnwatchProject, onFsWriteDetected, fsWatcherStatus } from '../../adapters/fs-watcher-bridge';
   import { recordExternalWrite } from '../../stores/conflicts.svelte';
   import { notify, dismissNotification } from '../../stores/notifications.svelte';
@@ -52,6 +52,11 @@
     terminalExpanded = !terminalExpanded;
   }
 
+  // Sync per-project stall threshold to health store
+  $effect(() => {
+    setStallThreshold(project.id, project.stallThresholdMin ?? null);
+  });
+
   // S-1 Phase 2: start filesystem watcher for this project's CWD
   $effect(() => {
     const cwd = project.cwd;

v2/src/lib/components/Workspace/SettingsTab.svelte

@@ -808,6 +808,26 @@
               </label>
             </div>
 
+            <div class="card-field">
+              <span class="card-field-label">
+                <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M12 6v6l4 2"/></svg>
+                Stall Threshold
+              </span>
+              <div class="scale-slider">
+                <input
+                  type="range"
+                  min="5"
+                  max="60"
+                  step="5"
+                  value={project.stallThresholdMin ?? 15}
+                  oninput={(e) => {
+                    updateProject(activeGroupId, project.id, { stallThresholdMin: parseInt((e.target as HTMLInputElement).value) });
+                  }}
+                />
+                <span class="scale-label">{project.stallThresholdMin ?? 15} min</span>
+              </div>
+            </div>
+
             <div class="card-footer">
               <button class="btn-remove" onclick={() => removeProject(activeGroupId, project.id)}>
                 <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M3 6h18"/><path d="M8 6V4h8v2"/><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6"/></svg>

v2/src/lib/stores/health.svelte.ts

@@ -35,7 +35,7 @@ export type AttentionItem = ProjectHealth & { projectName: string; projectIcon:
 
 // --- Configuration ---
 
-const STALL_THRESHOLD_MS = 15 * 60 * 1000; // 15 minutes
+const DEFAULT_STALL_THRESHOLD_MS = 15 * 60 * 1000; // 15 minutes
 const TICK_INTERVAL_MS = 5_000; // Update derived state every 5s
 const BURN_RATE_WINDOW_MS = 5 * 60 * 1000; // 5-minute window for burn rate calc
 
@@ -74,6 +74,7 @@ interface ProjectTracker {
 }
 
 let trackers = $state<Map<string, ProjectTracker>>(new Map());
+let stallThresholds = $state<Map<string, number>>(new Map()); // projectId → ms
 let tickTs = $state<number>(Date.now());
 let tickInterval: ReturnType<typeof setInterval> | null = null;
 
@@ -102,6 +103,15 @@ export function untrackProject(projectId: string): void {
   trackers.delete(projectId);
 }
 
+/** Set per-project stall threshold in minutes (null to use default) */
+export function setStallThreshold(projectId: string, minutes: number | null): void {
+  if (minutes === null) {
+    stallThresholds.delete(projectId);
+  } else {
+    stallThresholds.set(projectId, minutes * 60 * 1000);
+  }
+}
+
 /** Update session ID for a tracked project */
 export function updateProjectSession(projectId: string, sessionId: string): void {
   const t = trackers.get(projectId);
@@ -177,6 +187,7 @@ export function stopHealthTick(): void {
 /** Clear all tracked projects */
 export function clearHealthTracking(): void {
   trackers = new Map();
+  stallThresholds = new Map();
 }
 
 // --- Derived health per project ---
@@ -217,7 +228,8 @@ function computeHealth(tracker: ProjectTracker, now: number): ProjectHealth {
     idleDurationMs = 0;
   } else {
     idleDurationMs = now - tracker.lastActivityTs;
-    if (idleDurationMs >= STALL_THRESHOLD_MS) {
+    const stallMs = stallThresholds.get(tracker.projectId) ?? DEFAULT_STALL_THRESHOLD_MS;
+    if (idleDurationMs >= stallMs) {
       activityState = 'stalled';
     } else {
       activityState = 'idle';

v2/src/lib/types/groups.ts

@@ -16,6 +16,8 @@ export interface ProjectConfig {
   useWorktrees?: boolean;
   /** Anchor token budget scale (defaults to 'medium' = 6K tokens) */
   anchorBudgetScale?: AnchorBudgetScale;
+  /** Stall detection threshold in minutes (defaults to 15) */
+  stallThresholdMin?: number;
 }
 
 export interface GroupConfig {