feat(skills): Add plan-awareness to bead workflow skills

- parallel_beads: Filter beads by plan readiness before selection
  - Include beads with plans or type=bug
  - Warn about skipped beads that need plans first
- beads_implement: Check for plan based on bead type
  - Bugs can proceed without plans
  - Features/tasks warn and ask user preference
- beads_workflow: Document design decisions
  - Artifacts vs statuses for phase tracking
  - One bead per feature as default
  - Discovered-work pattern for splitting work

Closes: nixos-configs-45r, nixos-configs-8gr, nixos-configs-oog, nixos-configs-505

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

home/roles/development/skills/parallel_beads.md

@@ -9,8 +9,29 @@ This skill orchestrates parallel bead processing using subagents. Each bead gets
 ## Phase 1: Selection
 
 1. **Get ready beads**: Run `bd ready` to list all beads with no blockers
-2. **Present selection**: Use `AskUserQuestion` with `multiSelect: true` to let the user choose which beads to work on
+
+2. **Filter by plan readiness**:
+   For each ready bead, check if it's ready for batch implementation:
+   - **Has plan** (`thoughts/beads-{id}/plan.md` exists): Include
+   - **type=bug** without plan: Include (simple bugs can implement directly)
+   - **type=feature/task** without plan: Exclude with warning
+
+   ```bash
+   # Check for plan existence
+   ls thoughts/beads-{bead-id}/plan.md 2>/dev/null
+   ```
+
+3. **Report skipped beads**:
+   If any beads were skipped, inform the user:
+   ```
+   Skipped beads (no plan):
+   - {bead-id}: {title} (type: feature) - Run /beads_plan {bead-id} first
+   - {bead-id}: {title} (type: task) - Run /beads_plan {bead-id} first
+   ```
+
+4. **Present selection**: Use `AskUserQuestion` with `multiSelect: true` to let the user choose which beads to work on
    - Include bead ID and title for each option
+   - Only show beads that passed the plan check
    - Allow selection of multiple beads
 
 Example:
@@ -18,7 +39,7 @@ Example:
 AskUserQuestion with:
 - question: "Which beads do you want to work on in parallel?"
 - multiSelect: true
-- options from bd ready output
+- options from filtered bd ready output
 ```
 
 ## Phase 2: Parallel Implementation