Update confidence enum values across workflow tools

Added new confidence values (very_high, almost_certain) to all workflow tools
to provide more granular confidence tracking. Updated enum declarations in:
- analyze.py, codereview.py, debug.py, precommit.py, secaudit.py, testgen.py
- Updated debug.py's get_required_actions to handle new confidence values
- All tools now use consistent 7-value confidence scale
- refactor.py kept its unique scale (exploring/incomplete/partial/complete)

Also fixed model thinking configuration:
- Added very_high and almost_certain to MODEL_THINKING_PREFERENCES
- Set medium thinking for very_high, high thinking for almost_certain
- Updated prompts to clarify certain means 100% local confidence

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

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

tools/analyze.py

@@ -91,7 +91,8 @@ ANALYZE_WORKFLOW_FIELD_DESCRIPTIONS = {
     "confidence": (
         "Your confidence level in the current analysis findings: exploring (early investigation), "
         "low (some insights but more needed), medium (solid understanding), high (comprehensive insights), "
-        "certain (complete analysis ready for expert validation)"
+        "very_high (very comprehensive insights), almost_certain (nearly complete analysis), "
+        "certain (100% confidence - complete analysis ready for expert validation)"
     ),
     "analysis_type": "Type of analysis to perform (architecture, performance, security, quality, general)",
     "output_format": "How to format the output (summary, detailed, actionable)",
@@ -252,7 +253,7 @@ class AnalyzeTool(WorkflowTool):
             },
             "confidence": {
                 "type": "string",
-                "enum": ["exploring", "low", "medium", "high", "certain"],
+                "enum": ["exploring", "low", "medium", "high", "very_high", "almost_certain", "certain"],
                 "description": ANALYZE_WORKFLOW_FIELD_DESCRIPTIONS["confidence"],
             },
             "backtrack_from_step": {