Docs info route can fatal on duplicate bootstrap

[chubes4]

Problem

The 24-hour PHP error report contains a real fatal from the API plugin:

Cannot redeclare function extrachill_api_register_docs_info_routes() (previously declared in .../extrachill-api/inc/routes/docs/docs-info.php) in .../extrachill-api/inc/routes/docs/docs-info.php:15

Count: 1 in the last 24 hours.

Unlike the other current fatal signatures, this one is not from WP_CLI eval; it terminates while loading a plugin route file.

Code evidence

• extrachill-api.php:73-90 recursively loads every PHP file below inc/routes/ with require_once $file->getRealPath().
• inc/routes/docs/docs-info.php:10-15 registers a global callback and declares it unconditionally.
• A repository grep finds only this declaration and the recursive loader, so the second load likely comes from a duplicate plugin bootstrap or a path-identity/symlink mismatch that bypasses PHP's require_once identity.

Investigation

1. Capture request/runtime context for this signature and determine how the plugin or route file is loaded twice.
2. Make plugin bootstrap idempotent at the owning boundary rather than adding scattered function_exists() workarounds to route files.
3. Audit whether other global route declarations share the same fatal risk.

Acceptance

• Reproducing a duplicate bootstrap does not redeclare route callbacks or fatal.
• Normal REST route registration still occurs exactly once.
• Add a focused regression test for duplicate bootstrap/path loading if the test surface supports it.

Constraints

Use the smallest owner-level fix. Do not introduce a new route registry or wrapper abstraction; WordPress hooks and the existing plugin singleton should remain the primitives.