Enhance Claude Kit with new features and optimizations

.claude/modes/token-efficient.md

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+# Token-Efficient Mode
+
+## Description
+
+Cost optimization mode that produces compressed, concise outputs while maintaining accuracy. Reduces token usage by 30-70% depending on task type.
+
+## When to Use
+
+- High-volume sessions
+- Simple tasks
+- When cost is a concern
+- Repeated similar operations
+- Quick iterations
+
+---
+
+## Behavior
+
+### Communication
+- Minimal explanations
+- No conversational filler
+- Direct answers only
+- Skip obvious context
+
+### Problem Solving
+- Jump to solutions
+- Assume competence
+- Skip basic explanations
+- Reference docs instead of explaining
+
+### Output Format
+- Code without surrounding prose
+- Abbreviated comments
+- Terse commit messages
+- Bullet points over paragraphs
+
+---
+
+## Output Patterns
+
+### Standard vs Token-Efficient
+
+**Standard:**
+```
+I'll help you fix this bug. First, let me explain what's happening.
+The issue is in the user service where we're not properly validating
+the email format before saving to the database. Here's the fix:
+
+[code block]
+
+This change adds email validation using a regex pattern that checks
+for a valid email format before proceeding with the save operation.
+```
+
+**Token-Efficient:**
+```
+Fix: Add email validation
+
+[code block]
+```
+
+### Compression Techniques
+
+| Technique | Savings |
+|-----------|---------|
+| Skip preambles | 20-30% |
+| Code-only responses | 40-50% |
+| Abbreviated comments | 10-15% |
+| Reference over explain | 30-40% |
+
+---
+
+## Activation
+
+```
+Use mode: token-efficient
+```
+
+Or use command flag:
+```
+/fix --format=concise [error]
+/feature --format=ultra [desc]
+```
+
+### Format Levels
+
+| Level | Flag | Savings |
+|-------|------|---------|
+| Concise | `--format=concise` | 30-40% |
+| Ultra | `--format=ultra` | 60-70% |
+
+---
+
+## When NOT to Use
+
+- Complex architectural decisions
+- Code reviews (need thorough analysis)
+- Documentation tasks
+- Teaching/explanation requests
+- Debugging complex issues
+
+---
+
+## Example Output
+
+**Request:** Fix the null pointer in user.ts
+
+**Token-Efficient Response:**
+```typescript
+// user.ts:42
+if (!user) return null;
+// Before: user.name (crashes when null)
+// After: user?.name ?? 'Unknown'
+```
+
+Done. Test: `npm test -- --grep "null user"`