feat(flutter-cursor-templates): introduce MCP integration and conventions in project brief

- Added optional MCP integration settings in project-brief.yaml, allowing for environment-based server configurations.
- Introduced conventions for strict package imports to enhance code organization and maintainability.
- Updated brief schema to validate new MCP properties and ensure correct usage.
- Implemented MCP JSON builder to generate .cursor/mcp.json based on project brief settings.
- Enhanced resolver to include MCP configuration in generated files when enabled.

This update improves integration capabilities and enforces coding standards across the project.

flutter-cursor-templates/templates/rules/universal/flutter-core.mdc.tmpl

@@ -1,6 +1,7 @@
 ---
-description: "Core Flutter conventions for {{PROJECT_NAME}} — always applied"
-alwaysApply: true
+description: "Core Flutter conventions for {{PROJECT_NAME}}"
+globs: ["lib/**/*.dart", "test/**/*.dart", "integration_test/**/*.dart"]
+alwaysApply: false
 ---
 
 # Flutter Core Standards — {{PROJECT_NAME}}
@@ -29,10 +30,7 @@ alwaysApply: true
 - Private members: `_camelCase`
 
 ## Imports
-- Order: dart: → package: → relative
-- Use relative imports within a feature; absolute for cross-feature
-- Never import a feature's internal files from outside that feature
-
+{{IMPORT_POLICY_BLOCK}}
 ## Code quality
 - Max function length: 40 lines. Extract widgets and helpers aggressively
 - No `print()` in production code — use a logging package

flutter-cursor-templates/templates/rules/universal/project-context.mdc.tmpl

@@ -1,6 +1,7 @@
 ---
-description: "Project context for {{PROJECT_NAME}} — always applied"
-alwaysApply: true
+description: "Stack summary and product context for {{PROJECT_NAME}}"
+globs: ["project-brief.yaml", ".cursor/**/*.md", ".cursor/**/*.mdc", "pubspec.yaml"]
+alwaysApply: false
 ---
 
 # Project Context — {{PROJECT_NAME}}

flutter-cursor-templates/templates/rules/universal/rule-authoring.mdc.tmpl

@@ -0,0 +1,24 @@
+---
+description: How Cursor rules in this repository must be written and maintained.
+globs: [".cursor/rules/**/*.mdc"]
+alwaysApply: true
+---
+
+# Rule authoring — {{PROJECT_NAME}}
+
+## Context
+Rules are version-controlled contracts for AI assistants. Poor rules waste context and silently steer every edit.
+
+## Constraints
+- One focused concern per file; split broad topics instead of one mega-rule
+- Every rule MUST have a clear `description` in frontmatter (one sentence)
+- Prefer `alwaysApply: false` with **narrow** `globs` for domain rules — reserve `alwaysApply: true` for meta and safety
+- `globs` must be as specific as possible — never `["**/*"]` unless tooling requires it
+- Code samples in rules MUST be valid for this project (Dart/Flutter/YAML as appropriate)
+- Deprecated guidance is removed, not left commented out
+- Each substantive rule includes **Context** (why), **Constraints** (must/must not), and where helpful **Patterns** / **Anti-patterns**
+
+## Anti-patterns
+- Domain rules (testing, l10n, a feature) with `alwaysApply: true` — burns context
+- Rules with no concrete examples when the topic is code-facing
+- Stale feature rules after modules are removed — run `tool/cursor_audit.sh` periodically

flutter-cursor-templates/templates/rules/universal/ui-ux-standards.mdc.tmpl

@@ -1,6 +1,7 @@
 ---
-description: "UI/UX standards for {{PROJECT_NAME}} — always applied"
-alwaysApply: true
+description: "UI/UX standards for {{PROJECT_NAME}}"
+globs: ["lib/**/*.dart", "test/**/*.dart", "integration_test/**/*.dart"]
+alwaysApply: false
 ---
 
 # UI / UX Standards — {{PROJECT_NAME}}