Closes#115. The Security Auditor hourly cron (and likely others) hit a
~36% miss rate because the platform's A2A proxy rejected fires with
"workspace agent busy — retry after a short backoff" while the agent was
still executing the prior audit. That error was recorded as a hard
failure and polluted last_error.
New behaviour:
Before fireSchedule calls into the A2A proxy, it reads
workspaces.active_tasks for the target. If >0, it:
- Advances next_run_at to the next cron slot (cron keeps ticking)
- Bumps run_count
- Sets last_status='skipped' + last_error=<reason>
- Inserts a cron_run activity_logs row with status='skipped' + error_detail
- Broadcasts CRON_SKIPPED for canvas + operators
Effect: busy-collision ceases to be an error. The history surface now
distinguishes "ran and failed" from "skipped because busy". Operators
can tell the difference at a glance, and the liveness view doesn't
stall waiting for the next ticker cycle.
Pairs with #149 (dedicated heartbeat pulse) and #152 problem B
(error_detail surfaced in history) for a coherent scheduler story.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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