## Overview
Detects when no valid entrypoint (Main.main or main) exists in analyzed code.
## Implementation Details
- **Rule**: `rule_missing_entrypoint.hako` following single-responsibility box principles
- **Detection**: Checks if any entrypoint from entrypoints[] exists in methods[]
- **Pattern Matching**: Matches "Main.main" or "main" with any arity (e.g., Main.main/0, Main.main/1)
- **Integration**: Added to cli.hako with debug output support
## Test Cases
- **ok.hako**: Main box with main() method → no warning
- **ng.hako**: Main box with run() method (not main) → HC014 + HC011 warnings
- HC011: Main.run/0 unreachable (no entrypoint calling it)
- HC014: Missing entrypoint (correct cascading diagnostics)
## Test Results
```
[TEST/OK] HC011_dead_methods
[TEST/OK] HC012_dead_static_box
[TEST/OK] HC013_duplicate_method
[TEST/OK] HC014_missing_entrypoint ← NEW
[TEST/OK] HC016_unused_alias
[TEST/SUMMARY] all green
```
## Architecture
- Box-first design: RuleMissingEntrypointBox with single responsibility
- Helper method: _has_entrypoint_method() for clean separation of concerns
- Diagnostic format: "[HC014] missing entrypoint (Main.main or main)"
- Severity: "warning" (non-blocking, informational)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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