docs: Add blog post and new slash commands for development workflow

- Add blog post: 4 Essential Slash Commands I Use in Every Project
- Add new slash commands: /doc-refactor, /setup-ci-cd, /unit-test-expand
- Update slash-commands README with comprehensive documentation
- Simplify /push-all command structure
- Archive add-blog-post-slash-commands change
- Add blog-post spec and pending openspec changes

openspec/changes/add-context-tracking-hooks/tasks.md

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+# Tasks: Add Context Usage Tracking Documentation
+
+## 1. Documentation Updates
+
+- [x] 1.1 Add "Context Tracking Hook Pairs" section to README explaining pre-message/post-response concept
+- [x] 1.2 Document how UserPromptSubmit serves as pre-message hook
+- [x] 1.3 Document how Stop serves as post-response hook
+- [x] 1.4 Explain token delta calculation methodology
+
+## 2. Example Scripts
+
+- [x] 2.1 Create `context-tracker.py` example script with character estimation (zero dependencies)
+- [x] 2.2 Create `context-tracker-tiktoken.py` example script with tiktoken method (more accurate)
+- [x] 2.3 Implement UserPromptSubmit handler (save pre-message count)
+- [x] 2.4 Implement Stop handler (calculate and report delta)
+- [x] 2.5 Add clear inline comments explaining both approaches
+
+## 3. Configuration Examples
+
+- [x] 3.1 Add hook configuration example for UserPromptSubmit event
+- [x] 3.2 Add hook configuration example for Stop event
+- [x] 3.3 Provide combined configuration showing both hooks together
+
+## 4. Token Counting Methods Documentation
+
+- [x] 4.1 Document tiktoken with p50k_base method (more accurate, ~90-95%)
+- [x] 4.2 Document character-based estimation method (simple, ~80-90%)
+- [x] 4.3 Create comparison table of both offline methods
+- [x] 4.4 Explain what's included/excluded from transcript
+- [x] 4.5 Add caveat that no official Claude offline tokenizer exists
+
+## 5. Validation
+
+- [x] 5.1 Test example script with sample JSON input
+- [x] 5.2 Verify configuration examples have valid JSON syntax
+- [x] 5.3 Run openspec validate to confirm proposal is complete