Upgrade workflows to latest gh-aw version (v0.33.8) (#85)

This commit upgrades all agentic workflows to be compatible with gh-aw v0.33.8.

## Changes Made

### Fixed Deprecation Warnings
- Replaced deprecated `command:` trigger with `slash_command:` in 4 workflows:
  - plan.md
  - pr-fix.md
  - q.md
  - repo-ask.md

### Improved Scheduling
- Updated weekly-research.md to use fuzzy scheduling (`cron: "weekly on monday"`)
  instead of fixed time to distribute workflow execution load

### Recompiled All Workflows
- Regenerated all .lock.yml files with latest gh-aw v0.33.8
- Updated action pins and workflow configurations
- All workflows now compile successfully with 0 errors

## gh-aw v0.33.8 Key Features
- Firewall (AWF) now enabled by default for all engines
- MCP configuration created by default in `gh aw init`
- Automatic fixes via codemods in `gh aw update`
- Fixed critical bug with missing GH_AW_WORKFLOW_ID

## Testing
- Ran `gh aw compile --validate` on all workflows
- All 17 workflows compile successfully
- Remaining warnings are informational only

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: github-actions[bot]

workflows/plan.md

@@ -2,7 +2,7 @@
 name: Plan Command
 description: Generates project plans and task breakdowns when invoked with /plan command in issues or PRs
 on:
-  command:
+  slash_command:
     name: plan
     events: [issue_comment, discussion_comment]
 permissions:

workflows/pr-fix.md

@@ -7,7 +7,7 @@ description: |
   development flowing.
 
 on:
-  command:
+  slash_command:
     name: pr-fix
   reaction: "eyes"
   stop-after: +1mo

workflows/q.md

@@ -5,7 +5,7 @@ description: |
   identifying missing tools, and detecting inefficiencies.
 
 on:
-  command:
+  slash_command:
     name: q
   reaction: rocket
   stop-after: +1mo

workflows/repo-ask.md

@@ -7,7 +7,7 @@ description: |
   queries.
 
 on:
-  command:
+  slash_command:
     name: repo-ask
   reaction: "eyes"
   stop-after: +1mo

workflows/weekly-research.md

@@ -8,8 +8,8 @@ description: |
 
 on:
   schedule:
-    # Every week, 9AM UTC, Monday
-    - cron: "0 9 * * 1"
+    # Every week, Monday (fuzzy scheduling to distribute load)
+    - cron: "weekly on monday"
   workflow_dispatch:
 
   stop-after: +1mo # workflow will no longer trigger after 1 month. Remove this and recompile to run indefinitely