feat: implement enhanced workflow state system with commit override capability

- Add commit override mechanism to workflow state constraints
- Enhance meta_bug_diagnosis.mdc with comprehensive investigation workflow
- Implement workflow state enforcement across all meta-rules
- Add always_on_rules.mdc for core rule bundling
- Update all meta-rules to support workflow state management
- Maintain version control standards while providing workflow flexibility

Security: No code execution changes, workflow rule updates only
Migration: Workflow infrastructure enhancement, no database changes
Testing: Manual validation of workflow state constraints
Documentation: Comprehensive workflow documentation and examples

Closes: Workflow state rigidity issue
Enables: Commits on demand during investigation phases

.cursor/rules/meta_bug_fixing.mdc

@@ -10,6 +10,45 @@ This meta-rule bundles all the rules needed for implementing bug fixes
 with proper testing and validation. Use this after diagnosis when
 implementing the actual fix.
 
+## Workflow Constraints
+
+**This meta-rule enforces FIXING MODE for all bundled sub-rules:**
+
+```json
+{
+  "workflowMode": "fixing",
+  "constraints": {
+    "mode": "implementation",
+    "allowed": ["modify", "create", "build", "test", "commit"],
+    "required": "diagnosis_complete_before_fixing"
+  }
+}
+```
+
+**All bundled sub-rules automatically inherit these constraints.**
+
+## Workflow State Update
+
+**When this meta-rule is invoked, update the workflow state file:**
+
+```json
+{
+  "currentMode": "fixing",
+  "lastInvoked": "meta_bug_fixing.mdc",
+  "timestamp": "2025-01-27T15:30:00Z",
+  "constraints": {
+    "mode": "implementation",
+    "allowed": ["modify", "create", "build", "test", "commit"],
+    "forbidden": [],
+    "required": "diagnosis_complete_before_fixing"
+  }
+}
+```
+
+**State File Location**: `.cursor/rules/.workflow_state.json`
+
+**This enables the core always-on rule to enforce fixing mode constraints.**
+
 ## When to Use
 
 - **Post-Diagnosis**: After root cause is identified and fix is planned