feat(metrics): add phase-0 baseline counters

Diagrams reviewed: docs/architecture/AGENT_DIAGRAM.md, docs/architecture/GATEWAY_SESSIONS_AND_QUEUE.md, docs/api/PROTOCOL.md (no changes required).

src/daemon/index.ts

@@ -260,6 +260,7 @@ export async function startDaemon(config: Config, options?: StartDaemonOptions):
   const messageRouter = createMessageRouter({
     sessionManager, modelRouter, systemPrompt, toolRegistry, toolExecutor,
     config, memoryStore, agentConfigRegistry, agentRouter, sandboxManager, commandRegistry, hookEngine, intentRegistry, routingPolicy, skillRegistry, skillInstaller,
+    metrics: gateway.getMetrics(),
     getBackendMode: () => backendMode,
     setBackendMode: (mode) => {
       backendMode = mode;

src/daemon/routing.ts

@@ -32,6 +32,7 @@ import { loadSkillRegistryCatalog } from '../skills/index.js';
 import type { SkillInstaller, SkillRegistry, SkillRegistryEntry, SkillRegistrySource } from '../skills/index.js';
 import { auditLogger } from '../audit/index.js';
 import { getElevationStatusMessage, setElevationFromInput } from '../security/elevation.js';
+import type { MetricsCollector } from '../gateway/metrics.js';
 import { dirname, resolve } from 'path';
 import { loadCouncilScaffoldSafe } from '../councils/scaffold.js';
 import { buildCouncilPreflightReport, shouldRunCouncilPreflight } from '../councils/preflight.js';
@@ -363,6 +364,7 @@ export function createMessageRouter(deps: {
   systemPrompt: string;
   toolRegistry: ToolRegistry;
   toolExecutor: ToolExecutor;
+  metrics?: MetricsCollector;
   config: Config;
   memoryStore?: MemoryStore;
   agentConfigRegistry?: AgentConfigRegistry;
@@ -779,6 +781,7 @@ export function createMessageRouter(deps: {
           reason: 'no_rules',
           candidate_count: 0,
         });
+        deps.metrics?.recordReactionDecision({ matched: false, reason: 'no_rules' });
       } else {
         const reactionMatch = matchReactionPrompt(automationReactions, {
           channel: msg.channel,
@@ -799,6 +802,7 @@ export function createMessageRouter(deps: {
             candidate_count: automationReactions.length,
             filter_summary: buildReactionFilterSummary(matchedRule),
           });
+          deps.metrics?.recordReactionDecision({ matched: true });
         } else {
           auditLogger?.reactionSkip?.({
             session_id: sessionIdForRun,
@@ -808,6 +812,7 @@ export function createMessageRouter(deps: {
             reason: 'no_match',
             candidate_count: automationReactions.length,
           });
+          deps.metrics?.recordReactionDecision({ matched: false, reason: 'no_match' });
         }
       }
     }
@@ -1064,6 +1069,7 @@ export function createMessageRouter(deps: {
             const cancelStartedAt = Date.now();
             const run = activeRuns.get(session.id);
             if (!run || !run.isCancellable()) {
+              deps.metrics?.recordCancelLatency(Date.now() - cancelStartedAt);
               auditLogger?.runCancel?.({
                 session_id: session.id,
                 channel: msg.channel,
@@ -1078,6 +1084,7 @@ export function createMessageRouter(deps: {
             }
             run.cancel();
             const cancelLatencyMs = Date.now() - cancelStartedAt;
+            deps.metrics?.recordCancelLatency(cancelLatencyMs);
             auditLogger?.runCancel?.({
               session_id: session.id,
               channel: msg.channel,
@@ -1097,6 +1104,7 @@ export function createMessageRouter(deps: {
               request_id: msg.id,
               duration_ms: cancelLatencyMs,
             });
+            deps.metrics?.recordRunState('cancel_requested');
             return 'Cancellation requested. The active operation will stop at the next safe point.';
           },
 
@@ -1503,6 +1511,7 @@ export function createMessageRouter(deps: {
         state: 'start',
         request_id: msg.id,
       });
+      deps.metrics?.recordRunState('start');
 
       // Determine if the active model supports native audio input
       let effectiveTier: string = deps.config.agents.primary_tier ?? 'default';
@@ -1577,6 +1586,7 @@ export function createMessageRouter(deps: {
             request_id: msg.id,
             duration_ms: Date.now() - runStartedAt,
           });
+          deps.metrics?.recordRunState('complete');
           return;
         }
 
@@ -1673,6 +1683,7 @@ export function createMessageRouter(deps: {
             request_id: msg.id,
             duration_ms: Date.now() - runStartedAt,
           });
+          deps.metrics?.recordRunState('complete');
           return;
         } catch (error) {
           const detail = error instanceof Error ? error.message : String(error);
@@ -1716,17 +1727,19 @@ export function createMessageRouter(deps: {
         replyTo: msg.id,
         attachments: mergedAttachments.length > 0 ? mergedAttachments : undefined,
       });
+      const finalState = response.trim().toLowerCase() === 'operation cancelled by user.'
+        ? 'cancelled'
+        : 'complete';
       auditLogger?.runState?.({
         session_id: sessionIdForRun,
         channel: msg.channel,
         sender: msg.senderId,
         source: 'channel',
-        state: response.trim().toLowerCase() === 'operation cancelled by user.'
-          ? 'cancelled'
-          : 'complete',
+        state: finalState,
         request_id: msg.id,
         duration_ms: Date.now() - runStartedAt,
       });
+      deps.metrics?.recordRunState(finalState);
     } catch (error) {
       console.error(`Error processing message from ${msg.channel}:${msg.senderId}:`, error);
       await reply({
@@ -1742,6 +1755,7 @@ export function createMessageRouter(deps: {
         request_id: msg.id,
         error: error instanceof Error ? error.message : String(error),
       });
+      deps.metrics?.recordRunState('error');
     } finally {
       activeRuns.delete(sessionIdForRun);
     }