Add comprehensive project shortcuts system

- Create config/projects.nix for project definitions with templates
- Add scripts/templates/ with basic, content, and research workflows
- Create universal project-launcher.sh for template execution
- Integrate project system into zsh with dynamic alias generation
- Generate projects.json config file for shell script consumption
- Update README.md with project shortcuts documentation

Projects supported:
- blog: Personal blog (content workflow)
- mdshortcut: Research project (research workflow)
- nix-config: Nix configuration (basic workflow)

Usage: proj, blog, mdshortcut, nix-config commands

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

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

scripts/project-launcher.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+
+# Universal project launcher - reads project config and launches appropriate template
+# Usage: project-launcher.sh PROJECT_NAME
+
+PROJECT_NAME="$1"
+CONFIG_DIR="$(dirname "$0")/../config"
+PROJECTS_JSON="$CONFIG_DIR/projects.json"
+TEMPLATES_DIR="$(dirname "$0")/templates"
+
+if [ -z "$PROJECT_NAME" ]; then
+    echo "Available projects:"
+    if [ -f "$PROJECTS_JSON" ]; then
+        jq -r '.projects | keys[]' "$PROJECTS_JSON" 2>/dev/null || echo "No projects configured"
+    else
+        echo "No projects configured - run 'home-manager switch' to generate config"
+    fi
+    exit 1
+fi
+
+if [ ! -f "$PROJECTS_JSON" ]; then
+    echo "Error: Projects configuration not found. Run 'home-manager switch' to generate config."
+    exit 1
+fi
+
+# Extract project configuration
+PROJECT_CONFIG=$(jq -r ".projects.\"$PROJECT_NAME\"" "$PROJECTS_JSON" 2>/dev/null)
+if [ "$PROJECT_CONFIG" = "null" ]; then
+    echo "Error: Project '$PROJECT_NAME' not found."
+    echo "Available projects:"
+    jq -r '.projects | keys[]' "$PROJECTS_JSON" 2>/dev/null
+    exit 1
+fi
+
+TEMPLATE=$(echo "$PROJECT_CONFIG" | jq -r '.template')
+SESSION_NAME=$(echo "$PROJECT_CONFIG" | jq -r '.name')
+CODE_PATH=$(echo "$PROJECT_CONFIG" | jq -r '.codePath')
+CONTENT_PATH=$(echo "$PROJECT_CONFIG" | jq -r '.contentPath // empty')
+PAPER_PATH=$(echo "$PROJECT_CONFIG" | jq -r '.paperPath // empty')
+
+# Launch appropriate template
+case "$TEMPLATE" in
+    "basic")
+        exec "$TEMPLATES_DIR/basic.sh" "$SESSION_NAME" "$CODE_PATH"
+        ;;
+    "content")
+        if [ -z "$CONTENT_PATH" ]; then
+            echo "Error: Content template requires contentPath"
+            exit 1
+        fi
+        exec "$TEMPLATES_DIR/content.sh" "$SESSION_NAME" "$CODE_PATH" "$CONTENT_PATH"
+        ;;
+    "research")
+        if [ -z "$PAPER_PATH" ]; then
+            echo "Error: Research template requires paperPath"
+            exit 1
+        fi
+        exec "$TEMPLATES_DIR/research.sh" "$SESSION_NAME" "$CODE_PATH" "$PAPER_PATH"
+        ;;
+    *)
+        echo "Error: Unknown template '$TEMPLATE'"
+        exit 1
+        ;;
+esac