feat(parallel_beads): Enhanced validation reporting in PR descriptions

- Added ERROR status for execution failures (command not found, permission error)
- Added status definitions: PASS, FAIL, SKIP, ERROR with clear criteria
- Restructured PR template with three validation sections:
  - Automated Checks: table of executed checks with status
  - Manual Verification Required: unchecked boxes from plan
  - CONTRIBUTING.md Compliance: extracted requirements with verification status
- Added instructions to extract manual verification items from plans
- Enhanced CONTRIBUTING.md extraction to track automated vs manual requirements
- Updated validation summary format to include error count

home/roles/development/skills/parallel_beads.md

@@ -135,11 +135,16 @@ Worktree path: [WORKTREE_PATH]
      - Extract each verification command (lines starting with `- [ ]` followed by a command)
      - Example: `- [ ] Tests pass: \`make test\`` → extract `make test`
      - Note any "Per CONTRIBUTING.md:" requirements for additional validation
+     - Also read the "Manual Verification" section from the plan if present
+     - Save manual verification items for inclusion in the PR description (they won't be executed)
    - If no plan exists, use best-effort validation:
      - Check if `Makefile` exists → try `make test` and `make lint`
      - Check if `flake.nix` exists → try `nix flake check`
      - Check if `package.json` exists → try `npm test`
      - **Check for CONTRIBUTING.md** → read and extract testing/linting requirements
+       - Track which requirements can be automated vs need manual review
+       - Automated: commands that can be run (e.g., "run `make test`")
+       - Manual: qualitative checks (e.g., "ensure documentation is updated")
      - If none found, note "No validation criteria found"
 
 5. **Implement the changes**:
@@ -153,8 +158,16 @@ Worktree path: [WORKTREE_PATH]
      VALIDATION_RESULTS:
      - make test: PASS
      - make lint: FAIL (exit code 1: src/foo.ts:23 - missing semicolon)
-     - nix flake check: SKIP (command not found)
+     - nix flake check: SKIP (not applicable - no flake.nix)
+     - cargo test: ERROR (command not found)
      ```
+
+   **Status definitions:**
+   - **PASS**: Check executed successfully with no issues
+   - **FAIL**: Check executed but found issues that need attention
+   - **SKIP**: Check not applicable to this project (e.g., no Makefile for `make test`)
+   - **ERROR**: Check could not execute (missing tool, permission error, command not found)
+
    - If any validation fails:
      - Continue with PR creation (don't block)
      - Document failures in bead notes: `bd update [BEAD_ID] --notes="Validation failures: [list]"`
@@ -187,14 +200,27 @@ Worktree path: [WORKTREE_PATH]
      ## Changes
      - [List of changes made]
 
-     ## Validation
-     [Include validation results from step 4]
+     ## Validation Steps Completed
 
+     ### Automated Checks
      | Check | Status | Details |
      |-------|--------|---------|
      | make test | PASS | |
      | make lint | FAIL | src/foo.ts:23 - missing semicolon |
-     | nix flake check | SKIP | command not found |
+     | nix flake check | SKIP | not applicable - no flake.nix |
+     | cargo test | ERROR | command not found |
+
+     ### Manual Verification Required
+     [If plan has Manual Verification items, list them as unchecked boxes:]
+     - [ ] Verify UI changes match design mockups
+     - [ ] Test on mobile viewport sizes
+     [If no manual verification items: "None specified in plan."]
+
+     ### CONTRIBUTING.md Compliance
+     [If CONTRIBUTING.md requirements were extracted:]
+     - [x] Tests pass (verified via `make test`)
+     - [ ] Documentation updated (needs manual review)
+     [If no CONTRIBUTING.md: "No contribution guidelines found."]
      EOF
      )"
      ```
@@ -214,14 +240,27 @@ Worktree path: [WORKTREE_PATH]
      ## Changes
      - [List of changes made]
 
-     ## Validation
-     [Include validation results from step 4]
+     ## Validation Steps Completed
 
+     ### Automated Checks
      | Check | Status | Details |
      |-------|--------|---------|
      | make test | PASS | |
      | make lint | FAIL | src/foo.ts:23 - missing semicolon |
-     | nix flake check | SKIP | command not found |"
+     | nix flake check | SKIP | not applicable - no flake.nix |
+     | cargo test | ERROR | command not found |
+
+     ### Manual Verification Required
+     [If plan has Manual Verification items, list them as unchecked boxes:]
+     - [ ] Verify UI changes match design mockups
+     - [ ] Test on mobile viewport sizes
+     [If no manual verification items: None specified in plan.]
+
+     ### CONTRIBUTING.md Compliance
+     [If CONTRIBUTING.md requirements were extracted:]
+     - [x] Tests pass (verified via make test)
+     - [ ] Documentation updated (needs manual review)
+     [If no CONTRIBUTING.md: No contribution guidelines found.]"
      ```
 
 8. **Update bead status**:
@@ -235,8 +274,8 @@ PR: [PR_URL]"`
      - PR URL
      - Bead ID
      - Implementation status (success/failure/blocked)
-     - Validation summary: `X passed, Y failed, Z skipped`
-     - List of any validation failures with details
+     - Validation summary: `X passed, Y failed, Z skipped, W errors`
+     - List of any validation failures or errors with details
    - If blocked or unable to complete, explain what's blocking progress
    - If validation failed, include the specific failures so the main agent can summarize them for the user
 ```