feat(health): add project health store, Mission Control bar, and session metrics

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

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+// Project health tracking — Svelte 5 runes
+// Tracks per-project activity state, burn rate, context pressure, and attention scoring
+
+import { getAgentSession, type AgentSession } from './agents.svelte';
+
+// --- Types ---
+
+export type ActivityState = 'inactive' | 'running' | 'idle' | 'stalled';
+
+export interface ProjectHealth {
+  projectId: string;
+  sessionId: string | null;
+  /** Current activity state */
+  activityState: ActivityState;
+  /** Name of currently running tool (if any) */
+  activeTool: string | null;
+  /** Duration in ms since last activity (0 if running a tool) */
+  idleDurationMs: number;
+  /** Burn rate in USD per hour (0 if no data) */
+  burnRatePerHour: number;
+  /** Context pressure as fraction 0..1 (null if unknown) */
+  contextPressure: number | null;
+  /** Attention urgency score (higher = more urgent, 0 = no attention needed) */
+  attentionScore: number;
+  /** Human-readable attention reason */
+  attentionReason: string | null;
+}
+
+export type AttentionItem = ProjectHealth & { projectName: string; projectIcon: string };
+
+// --- Configuration ---
+
+const 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
+
+// Context limits by model (tokens)
+const MODEL_CONTEXT_LIMITS: Record<string, number> = {
+  'claude-sonnet-4-20250514': 200_000,
+  'claude-opus-4-20250514': 200_000,
+  'claude-haiku-4-20250506': 200_000,
+  'claude-3-5-sonnet-20241022': 200_000,
+  'claude-3-5-haiku-20241022': 200_000,
+  'claude-sonnet-4-6': 200_000,
+  'claude-opus-4-6': 200_000,
+};
+const DEFAULT_CONTEXT_LIMIT = 200_000;
+
+// Attention score weights (higher = more urgent)
+const SCORE_STALLED = 100;
+const SCORE_CONTEXT_CRITICAL = 80; // >90% context
+const SCORE_CONTEXT_HIGH = 40; // >75% context
+const SCORE_ERROR = 90;
+const SCORE_IDLE_LONG = 20; // >2x stall threshold but not stalled (shouldn't happen, safety)
+
+// --- State ---
+
+interface ProjectTracker {
+  projectId: string;
+  sessionId: string | null;
+  lastActivityTs: number; // epoch ms
+  lastToolName: string | null;
+  toolInFlight: boolean;
+  /** Token snapshots for burn rate calculation: [timestamp, totalTokens] */
+  tokenSnapshots: Array<[number, number]>;
+  /** Cost snapshots for $/hr: [timestamp, costUsd] */
+  costSnapshots: Array<[number, number]>;
+}
+
+let trackers = $state<Map<string, ProjectTracker>>(new Map());
+let tickTs = $state<number>(Date.now());
+let tickInterval: ReturnType<typeof setInterval> | null = null;
+
+// --- Public API ---
+
+/** Register a project for health tracking */
+export function trackProject(projectId: string, sessionId: string | null): void {
+  const existing = trackers.get(projectId);
+  if (existing) {
+    existing.sessionId = sessionId;
+    return;
+  }
+  trackers.set(projectId, {
+    projectId,
+    sessionId,
+    lastActivityTs: Date.now(),
+    lastToolName: null,
+    toolInFlight: false,
+    tokenSnapshots: [],
+    costSnapshots: [],
+  });
+}
+
+/** Remove a project from health tracking */
+export function untrackProject(projectId: string): void {
+  trackers.delete(projectId);
+}
+
+/** Update session ID for a tracked project */
+export function updateProjectSession(projectId: string, sessionId: string): void {
+  const t = trackers.get(projectId);
+  if (t) {
+    t.sessionId = sessionId;
+  }
+}
+
+/** Record activity — call on every agent message */
+export function recordActivity(projectId: string, toolName?: string): void {
+  const t = trackers.get(projectId);
+  if (!t) return;
+  t.lastActivityTs = Date.now();
+  if (toolName !== undefined) {
+    t.lastToolName = toolName;
+    t.toolInFlight = true;
+  }
+}
+
+/** Record tool completion */
+export function recordToolDone(projectId: string): void {
+  const t = trackers.get(projectId);
+  if (!t) return;
+  t.lastActivityTs = Date.now();
+  t.toolInFlight = false;
+}
+
+/** Record a token/cost snapshot for burn rate calculation */
+export function recordTokenSnapshot(projectId: string, totalTokens: number, costUsd: number): void {
+  const t = trackers.get(projectId);
+  if (!t) return;
+  const now = Date.now();
+  t.tokenSnapshots.push([now, totalTokens]);
+  t.costSnapshots.push([now, costUsd]);
+  // Prune old snapshots beyond window
+  const cutoff = now - BURN_RATE_WINDOW_MS * 2;
+  t.tokenSnapshots = t.tokenSnapshots.filter(([ts]) => ts > cutoff);
+  t.costSnapshots = t.costSnapshots.filter(([ts]) => ts > cutoff);
+}
+
+/** Start the health tick timer */
+export function startHealthTick(): void {
+  if (tickInterval) return;
+  tickInterval = setInterval(() => {
+    tickTs = Date.now();
+  }, TICK_INTERVAL_MS);
+}
+
+/** Stop the health tick timer */
+export function stopHealthTick(): void {
+  if (tickInterval) {
+    clearInterval(tickInterval);
+    tickInterval = null;
+  }
+}
+
+/** Clear all tracked projects */
+export function clearHealthTracking(): void {
+  trackers = new Map();
+}
+
+// --- Derived health per project ---
+
+function getContextLimit(model?: string): number {
+  if (!model) return DEFAULT_CONTEXT_LIMIT;
+  return MODEL_CONTEXT_LIMITS[model] ?? DEFAULT_CONTEXT_LIMIT;
+}
+
+function computeBurnRate(snapshots: Array<[number, number]>): number {
+  if (snapshots.length < 2) return 0;
+  const windowStart = Date.now() - BURN_RATE_WINDOW_MS;
+  const recent = snapshots.filter(([ts]) => ts >= windowStart);
+  if (recent.length < 2) return 0;
+  const first = recent[0];
+  const last = recent[recent.length - 1];
+  const elapsedHours = (last[0] - first[0]) / 3_600_000;
+  if (elapsedHours < 0.001) return 0; // Less than ~4 seconds
+  const costDelta = last[1] - first[1];
+  return Math.max(0, costDelta / elapsedHours);
+}
+
+function computeHealth(tracker: ProjectTracker, now: number): ProjectHealth {
+  const session: AgentSession | undefined = tracker.sessionId
+    ? getAgentSession(tracker.sessionId)
+    : undefined;
+
+  // Activity state
+  let activityState: ActivityState;
+  let idleDurationMs = 0;
+  let activeTool: string | null = null;
+
+  if (!session || session.status === 'idle' || session.status === 'done' || session.status === 'error') {
+    activityState = session?.status === 'error' ? 'inactive' : 'inactive';
+  } else if (tracker.toolInFlight) {
+    activityState = 'running';
+    activeTool = tracker.lastToolName;
+    idleDurationMs = 0;
+  } else {
+    idleDurationMs = now - tracker.lastActivityTs;
+    if (idleDurationMs >= STALL_THRESHOLD_MS) {
+      activityState = 'stalled';
+    } else {
+      activityState = 'idle';
+    }
+  }
+
+  // Context pressure
+  let contextPressure: number | null = null;
+  if (session && (session.inputTokens + session.outputTokens) > 0) {
+    const limit = getContextLimit(session.model);
+    contextPressure = Math.min(1, (session.inputTokens + session.outputTokens) / limit);
+  }
+
+  // Burn rate
+  const burnRatePerHour = computeBurnRate(tracker.costSnapshots);
+
+  // Attention scoring
+  let attentionScore = 0;
+  let attentionReason: string | null = null;
+
+  if (session?.status === 'error') {
+    attentionScore = SCORE_ERROR;
+    attentionReason = `Error: ${session.error?.slice(0, 60) ?? 'Unknown'}`;
+  } else if (activityState === 'stalled') {
+    attentionScore = SCORE_STALLED;
+    const mins = Math.floor(idleDurationMs / 60_000);
+    attentionReason = `Stalled — ${mins} min since last activity`;
+  } else if (contextPressure !== null && contextPressure > 0.9) {
+    attentionScore = SCORE_CONTEXT_CRITICAL;
+    attentionReason = `Context ${Math.round(contextPressure * 100)}% — near limit`;
+  } else if (contextPressure !== null && contextPressure > 0.75) {
+    attentionScore = SCORE_CONTEXT_HIGH;
+    attentionReason = `Context ${Math.round(contextPressure * 100)}%`;
+  }
+
+  return {
+    projectId: tracker.projectId,
+    sessionId: tracker.sessionId,
+    activityState,
+    activeTool,
+    idleDurationMs,
+    burnRatePerHour,
+    contextPressure,
+    attentionScore,
+    attentionReason,
+  };
+}
+
+/** Get health for a single project (reactive via tickTs) */
+export function getProjectHealth(projectId: string): ProjectHealth | null {
+  // Touch tickTs to make this reactive to the timer
+  const now = tickTs;
+  const t = trackers.get(projectId);
+  if (!t) return null;
+  return computeHealth(t, now);
+}
+
+/** Get all project health sorted by attention score descending */
+export function getAllProjectHealth(): ProjectHealth[] {
+  const now = tickTs;
+  const results: ProjectHealth[] = [];
+  for (const t of trackers.values()) {
+    results.push(computeHealth(t, now));
+  }
+  results.sort((a, b) => b.attentionScore - a.attentionScore);
+  return results;
+}
+
+/** Get top N items needing attention */
+export function getAttentionQueue(limit = 5): ProjectHealth[] {
+  return getAllProjectHealth().filter(h => h.attentionScore > 0).slice(0, limit);
+}
+
+/** Get aggregate stats across all tracked projects */
+export function getHealthAggregates(): {
+  running: number;
+  idle: number;
+  stalled: number;
+  totalBurnRatePerHour: number;
+} {
+  const all = getAllProjectHealth();
+  let running = 0;
+  let idle = 0;
+  let stalled = 0;
+  let totalBurnRatePerHour = 0;
+  for (const h of all) {
+    if (h.activityState === 'running') running++;
+    else if (h.activityState === 'idle') idle++;
+    else if (h.activityState === 'stalled') stalled++;
+    totalBurnRatePerHour += h.burnRatePerHour;
+  }
+  return { running, idle, stalled, totalBurnRatePerHour };
+}