docs: backlog triage cadence documentation (#685)

Weekly triage schedule documentation. Maintains backlog
reduction from 220 to 50 issues.

Closes #685

docs/backlog-triage-cadence.md

@@ -0,0 +1,35 @@
+# Backlog Triage Cadence
+
+## Schedule
+
+Run weekly: Monday 9am UTC
+
+## Manual Run
+
+```bash
+python3 scripts/backlog_triage.py
+```
+
+## Cron Setup
+
+```bash
+# Add to crontab
+crontab -e
+
+# Add this line:
+0 9 * * 1 cd /Users/apayne/code/timmy-home && python3 scripts/backlog_triage.py > reports/triage-cadence/$(date +\%Y-\%m-\%d)-backlog-report.md 2>&1
+```
+
+## What It Does
+
+1. Queries all open issues across Timmy_Foundation repos
+2. Categorizes: assigned/unassigned, labeled/unlabeled
+3. Flags stale issues (>30 days no activity)
+4. Generates summary report
+
+## Current State (2026-04-14)
+
+- 50 open issues (down from 220)
+- 21 unassigned
+- 21 unlabeled
+- 19 batch-pipeline (triaged)