docs: Add ProjectDiary.md for tracking development milestones

- Create ProjectDiary.md with reverse chronological milestone tracking
- Add make add-diary-entry target with Claude Code prerequisite check
- Include initial entry documenting today's infrastructure setup
- Track contributors, time estimates, and AI token usage
- Provide structured format for future development logging
- Guide users through diary entry creation process

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

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

Makefile

@@ -1,7 +1,7 @@
 # MarkiTect - Advanced Markdown Engine
 # Makefile for common development tasks
 
-.PHONY: help setup install test build clean update status dev lint format check-deps venv-status update-digest
+.PHONY: help setup install test build clean update status dev lint format check-deps venv-status update-digest add-diary-entry
 
 # Default target
 help:
@@ -30,7 +30,8 @@ help:
 	@echo "  check-deps  - Check dependency status"
 	@echo ""
 	@echo "Documentation:"
-	@echo "  update-digest - Update ProjectStatusDigest.md (requires Claude Code)"
+	@echo "  update-digest   - Update ProjectStatusDigest.md (requires Claude Code)"
+	@echo "  add-diary-entry - Add new entry to ProjectDiary.md (requires Claude Code)"
 
 # Python and virtual environment setup
 PYTHON := python3
@@ -174,3 +175,31 @@ update-digest:
 	@echo "   Command: 'Please update ProjectStatusDigest.md with the current project state'"
 	@echo ""
 	@echo "💡 Tip: You can also manually edit ProjectStatusDigest.md if needed"
+
+# Add new entry to project diary (requires Claude Code)
+add-diary-entry:
+	@echo "🔍 Checking for Claude Code availability..."
+	@if ! command -v claude >/dev/null 2>&1; then \
+		echo "❌ Claude Code not found in PATH"; \
+		echo "   This target requires Claude Code CLI to be installed"; \
+		echo "   Visit: https://claude.ai/code for installation instructions"; \
+		exit 1; \
+	fi
+	@echo "✅ Claude Code found"
+	@if [ ! -f ProjectDiary.md ]; then \
+		echo "❌ ProjectDiary.md not found"; \
+		echo "   Create the diary file first or run this from the project root"; \
+		exit 1; \
+	fi
+	@echo "📖 Adding new entry to ProjectDiary.md..."
+	@echo "   Please ask Claude Code to add a new diary entry for recent work"
+	@echo "   Command: 'Please add a new entry to ProjectDiary.md summarizing recent progress'"
+	@echo ""
+	@echo "📋 Entry should include:"
+	@echo "   - Date ($(shell date +%Y-%m-%d))"
+	@echo "   - One-line progress characterization"
+	@echo "   - Contributors since last entry"
+	@echo "   - Time estimate and AI token usage"
+	@echo "   - One paragraph work summary"
+	@echo ""
+	@echo "💡 Tip: New entries are added to the top for reverse chronological order"