Heartbeat: pre-check publish_date before dispatching Publisher worker

[aleks1k]

Problem

Currently the heartbeat dispatches a Publisher worker for any issue in To Publish queue, regardless of publish_date. The Publisher then reads the date, sees it's in the future, and calls work_finish(blocked) — wasting tokens.

What's needed

In the heartbeat dispatch logic (before a Publisher worker is spawned), read publish_date from the issue body and skip dispatch if the date is in the future.

Implementation

In lib/services/heartbeat/tick-runner.ts (or the queue dispatch loop), add a pre-check for publisher role:

// Before dispatching Publisher:
if (role === "publisher") {
  const publishDate = extractPublishDate(issue.description);
  if (publishDate && publishDate > new Date()) {
    // Skip — not yet time to publish
    continue;
  }
}

extractPublishDate() should parse publish_date: YYYY-MM-DD from issue body (same pattern as analytics-trigger's extractPublishedAt).

Bonus: GitHub Projects field

If GitHub Projects v2 is set up (issue #4), also check the Publish Date field value on the project item — more reliable than parsing issue body text.

Notes

• Must not affect other roles — only skip Publisher dispatch
• If publish_date is absent or invalid: dispatch normally (ASAP)
• Log skipped dispatches to audit log with reason "scheduled: publish_date not yet reached"