docs(tb-5oiy): document root cause of starvation alert

The bead worker correctly found no claimable beads because all open beads
were blocked by dependencies. This is expected behavior, not a configuration
error.

Bead-Id: tb-5oiy

notes/tb-5oiy.md

@@ -0,0 +1,55 @@
+# tb-5oiy: Starvation Alert Investigation
+
+## Issue
+The bead worker (Pluck) reported "No beads available to claim" even though the workspace had 5 open/in-progress beads.
+
+## Root Cause
+All open beads were **blocked by dependencies**:
+
+```
+tb-1sz9 (in_progress) ← blocks ← tb-69rc (open)
+                                ↓
+                             tb-4l7s (open)
+                                ↓
+                             tb-5n9 (open)
+                                ↑
+                             (also blocked by tb-23i)
+```
+
+### Dependency Chain
+1. **tb-69rc** (open) - blocked by tb-1sz9 (in_progress)
+2. **tb-4l7s** (open) - blocked by tb-69rc
+3. **tb-5n9** (open) - blocked by tb-4l7s and tb-23i
+
+### Additional Factor
+- **tb-5n9** has the `deferred` label, which may also exclude it from claiming
+
+## Why `br claim` Returns Nothing
+The `br claim` command only returns beads that are:
+- Status = `open`
+- NOT blocked by any dependencies
+- NOT ephemeral, pinned, or is_template
+- NOT assigned to another worker
+
+Since all open beads had blocking dependencies, none were "ready" to claim.
+
+## Resolution
+The starvation alert is **expected behavior** - the bead worker correctly identified that no beads were ready to be worked on. The dependency chain must be resolved (by completing tb-1sz9) before downstream beads become claimable.
+
+## Lessons Learned
+- Starvation alerts may indicate legitimate dependency blocking, not configuration errors
+- Check `br ready` to see unblocked beads
+- Use `sqlite3 .beads/beads.db "SELECT issue_id, depends_on_id FROM dependencies WHERE type='blocks'"` to audit blocking relationships
+- Consider labeling blocked beads with `blocked` for visibility
+
+## Verified Commands
+```bash
+# Check ready (unblocked) beads
+br ready
+
+# Check dependencies
+sqlite3 .beads/beads.db "SELECT issue_id, depends_on_id FROM dependencies WHERE issue_id IN ('tb-5n9', 'tb-69rc', 'tb-4l7s');"
+
+# Dry-run claim to see what would be claimed
+br claim --assignee "test-worker" --dry-run
+```