feat: Introduce @automaker/prompts package for AI prompt templates

Changes:
- Added a new package, @automaker/prompts, containing AI prompt templates for enhancing user-written task descriptions.
- Implemented four enhancement modes: improve, technical, simplify, and acceptance, each with corresponding system prompts and examples.
- Updated relevant packages to utilize the new prompts package, ensuring backward compatibility with existing imports.
- Enhanced documentation to include usage examples and integration details for the new prompts.

Benefits:
✅ Streamlined AI prompt management across the codebase
✅ Improved clarity and usability for AI-powered features
✅ Comprehensive documentation for developers

All tests passing.

package-lock.json

@@ -27,6 +27,7 @@
         "@automaker/git-utils": "^1.0.0",
         "@automaker/model-resolver": "^1.0.0",
         "@automaker/platform": "^1.0.0",
+        "@automaker/prompts": "^1.0.0",
         "@automaker/types": "^1.0.0",
         "@automaker/utils": "^1.0.0",
         "cors": "^2.8.5",
@@ -253,6 +254,29 @@
         "undici-types": "~6.21.0"
       }
     },
+    "libs/prompts": {
+      "name": "@automaker/prompts",
+      "version": "1.0.0",
+      "license": "SEE LICENSE IN LICENSE",
+      "dependencies": {
+        "@automaker/types": "^1.0.0"
+      },
+      "devDependencies": {
+        "@types/node": "^22.10.5",
+        "typescript": "^5.7.3",
+        "vitest": "^4.0.16"
+      }
+    },
+    "libs/prompts/node_modules/@types/node": {
+      "version": "22.19.3",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.3.tgz",
+      "integrity": "sha512-1N9SBnWYOJTrNZCdh/yJE+t910Y128BoyY+zBLWhL3r0TYzlTmFdXrPwHL9DyFZmlEXNQQolTZh3KHV31QDhyA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
+      }
+    },
     "libs/types": {
       "name": "@automaker/types",
       "version": "1.0.0",
@@ -333,6 +357,10 @@
       "resolved": "libs/platform",
       "link": true
     },
+    "node_modules/@automaker/prompts": {
+      "resolved": "libs/prompts",
+      "link": true
+    },
     "node_modules/@automaker/server": {
       "resolved": "apps/server",
       "link": true