chore: install openagent opencode

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/context/core/standards/code-quality.md

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+<!-- Context: standards/code | Priority: critical | Version: 2.0 | Updated: 2025-01-21 -->
+# Code Standards
+
+## Quick Reference
+
+**Core Philosophy**: Modular, Functional, Maintainable
+**Golden Rule**: If you can't easily test it, refactor it
+
+**Critical Patterns** (use these):
+- ✅ Pure functions (same input = same output, no side effects)
+- ✅ Immutability (create new data, don't modify)
+- ✅ Composition (build complex from simple)
+- ✅ Small functions (< 50 lines)
+- ✅ Explicit dependencies (dependency injection)
+
+**Anti-Patterns** (avoid these):
+- ❌ Mutation, side effects, deep nesting
+- ❌ God modules, global state, large functions
+
+---
+
+## Core Philosophy
+
+**Modular**: Everything is a component - small, focused, reusable
+**Functional**: Pure functions, immutability, composition over inheritance
+**Maintainable**: Self-documenting, testable, predictable
+
+## Principles
+
+### Modular Design
+- Single responsibility per module
+- Clear interfaces (explicit inputs/outputs)
+- Independent and composable
+- < 100 lines per component (ideally < 50)
+
+### Functional Approach
+- **Pure functions**: Same input = same output, no side effects
+- **Immutability**: Create new data, don't modify existing
+- **Composition**: Build complex from simple functions
+- **Declarative**: Describe what, not how
+
+### Component Structure
+```
+component/
+├── index.js      # Public interface
+├── core.js       # Core logic (pure functions)
+├── utils.js      # Helpers
+└── tests/        # Tests
+```
+
+## Patterns
+
+### Pure Functions
+```javascript
+// ✅ Pure
+const add = (a, b) => a + b;
+const formatUser = (user) => ({ ...user, fullName: `${user.firstName} ${user.lastName}` });
+
+// ❌ Impure (side effects)
+let total = 0;
+const addToTotal = (value) => { total += value; return total; };
+```
+
+### Immutability
+```javascript
+// ✅ Immutable
+const addItem = (items, item) => [...items, item];
+const updateUser = (user, changes) => ({ ...user, ...changes });
+
+// ❌ Mutable
+const addItem = (items, item) => { items.push(item); return items; };
+```
+
+### Composition
+```javascript
+// ✅ Compose small functions
+const processUser = pipe(validateUser, enrichUserData, saveUser);
+const isValidEmail = (email) => validateEmail(normalizeEmail(email));
+
+// ❌ Deep inheritance
+class ExtendedUserManagerWithValidation extends UserManager { }
+```
+
+### Declarative
+```javascript
+// ✅ Declarative
+const activeUsers = users.filter(u => u.isActive).map(u => u.name);
+
+// ❌ Imperative
+const names = [];
+for (let i = 0; i < users.length; i++) {
+  if (users[i].isActive) names.push(users[i].name);
+}
+```
+
+## Naming
+
+- **Files**: lowercase-with-dashes.js
+- **Functions**: verbPhrases (getUser, validateEmail)
+- **Predicates**: isValid, hasPermission, canAccess
+- **Variables**: descriptive (userCount not uc), const by default
+- **Constants**: UPPER_SNAKE_CASE
+
+## Error Handling
+
+```javascript
+// ✅ Explicit error handling
+function parseJSON(text) {
+  try {
+    return { success: true, data: JSON.parse(text) };
+  } catch (error) {
+    return { success: false, error: error.message };
+  }
+}
+
+// ✅ Validate at boundaries
+function createUser(userData) {
+  const validation = validateUserData(userData);
+  if (!validation.isValid) {
+    return { success: false, errors: validation.errors };
+  }
+  return { success: true, user: saveUser(userData) };
+}
+```
+
+## Dependency Injection
+
+```javascript
+// ✅ Dependencies explicit
+function createUserService(database, logger) {
+  return {
+    createUser: (userData) => {
+      logger.info('Creating user');
+      return database.insert('users', userData);
+    }
+  };
+}
+
+// ❌ Hidden dependencies
+import db from './database.js';
+function createUser(userData) { return db.insert('users', userData); }
+```
+
+## Anti-Patterns
+
+❌ **Mutation**: Modifying data in place
+❌ **Side effects**: console.log, API calls in pure functions
+❌ **Deep nesting**: Use early returns instead
+❌ **God modules**: Split into focused modules
+❌ **Global state**: Pass dependencies explicitly
+❌ **Large functions**: Keep < 50 lines
+
+## Best Practices
+
+✅ Pure functions whenever possible
+✅ Immutable data structures
+✅ Small, focused functions (< 50 lines)
+✅ Compose small functions into larger ones
+✅ Explicit dependencies (dependency injection)
+✅ Validate at boundaries
+✅ Self-documenting code
+✅ Test in isolation
+
+**Golden Rule**: If you can't easily test it, refactor it.