update readme with nix setup and disclaimer, increase scale max to 10

AGENTS.md

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+# Agent Guidelines for NLS Guilloche Generator
+
+**IMPORTANT**: This is an archived Angular 6 project. We maintain it for running purposes only - no development, upgrades, or new features. Never run npm commands directly; always use the Makefile/nix shell wrapper.
+
+## Build/Lint/Test Commands
+
+- **Build app**: `npm run build`
+- **Build library**: `npm run build:library`
+- **Start dev server**: `npm start`
+- **Lint**: `npm run lint`
+- **Run all tests**: `npm run test`
+- **Run single test**: `ng test --include="**/specific-test.spec.ts"`
+- **E2E tests**: `npm run e2e`
+
+## Code Style Guidelines
+
+### Formatting
+- 2-space indentation
+- Single quotes for strings
+- Semicolons always
+- Max line length: 140 characters
+- No trailing whitespace
+- Insert final newline in files
+
+### TypeScript/Angular
+- Target: ES5
+- Use `const` instead of `let` when possible
+- Arrow return shorthand
+- Interface over type literal
+- No unused expressions
+- No console.log (except debug/info/time/timeEnd/trace)
+- Component class suffix required
+- Import spacing required
+
+### Naming Conventions
+- **Components**: PascalCase + `Component` suffix (e.g., `AppComponent`)
+- **Services**: PascalCase + `Service` suffix (e.g., `NlsMathService`)
+- **Models**: PascalCase + `.model` suffix (e.g., `point.model.ts`)
+- **Files**: kebab-case for components, camelCase for services/models
+- **Properties/Methods**: camelCase
+
+### Member Ordering
+1. Static fields
+2. Instance fields
+3. Static methods
+4. Instance methods
+
+### Imports
+- Angular imports first
+- Third-party imports second
+- Local imports last
+- Use relative imports (`./` or `../`)
+
+### Error Handling
+- Follow standard TypeScript practices
+- Use appropriate Angular error handling patterns