feat: add issue proposer — auto-file GitHub issues from detection systems (#11)

Port issue-proposer scheduled task with 5 detectors:
1. Task failure patterns (repeated failure_kind in cc_tasks)
2. Repo failure rates (>50% fail rate over 7d)
3. Scheduled task errors (>50% error rate in 24h)
4. Argus/RuntimeGuard correlations (high-severity findings)
5. LLM trace anomalies (executor error rates >40% in 48h)

Dedup via web_events watermarks and GitHub issue search.
Configurable labels, repo target from env config, 6-hourly cadence
with governance limits (max 3 issues per run).

Closes #11

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

web/src/kernel/scheduled/index.ts

@@ -29,6 +29,7 @@ import { runConversationFactExtraction } from './conversation-facts.js';
 import { runEntropyDetection } from './entropy.js';
 import { runSocialEngagement } from './social-engage.js';
 import { runDevActivity } from './dev-activity.js';
+import { runIssueProposer } from './issue-proposer.js';
 import { InMemoryErrorTracker } from '../../lib/observability/errors.js';
 import { getChainHead, writeTaskAuditRecord } from './task-audit.js';
 
@@ -175,6 +176,9 @@ async function runCronPhase(env: EdgeEnv): Promise<void> {
   await runTask(env, 'feed-watcher', 'cron', runFeedWatcher);
   await runTask(env, 'cost-report', 'cron', runCostReport);
 
+  // Issue proposer — auto-file GitHub issues from detection systems (6-hourly, self-gated)
+  await runTask(env, 'issue-proposer', 'cron', runIssueProposer);
+
   // Heavy tasks -- mutually exclusive to stay under 50 subrequest limit
   const isSelfImprovementHour = hour % 6 === 0;