fix: simplify logger, fix prompts, and restore clean interactive release (refs #67 #71 #72)

[fxstein]

• Replace overengineered logger with simple, robust version
• Restore timestamp and branch formatting to logger output
• Make debug output conditional on DEBUG=1 or DEBUG=true
• Replace all echo DEBUG statements with log_debug calls
• Remove all debug mode wrappers - logger handles debug control
• Fix safe-prompt to output prompts to stderr (prevents command substitution issues)
• Ensure interactive release script works without debug interference
• Confirm all remaining echo statements are for UI or prompt output only
• Follow Unix best practices for prompt output

Closes #67, #71, #72

[github-actions]

🧪 Test Results

✅ All tests passed

Test Suites Executed:

• Unit Tests:
  • Logger Tests
  • Firmware Summary Tests
• Integration Tests:
  • Configuration Tests
  • Parameter Processing Tests
  • Storage Validation Tests
  • Integration Tests

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🔍 Test Logs: Available in workflow artifacts

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