📝 Add configured logger file control API docs

docs/api/configured-logger-file-clear-rotation.md

@@ -0,0 +1,74 @@
+---
+name: configured-logger-file-clear-rotation
+group: api
+category: runtime
+update-time: 20260512
+description: Disable runtime rotation on the configured file-backed logger sink.
+key-word:
+    - logger
+    - runtime
+    - file
+    - public
+---
+
+## Configured-logger-file-clear-rotation
+
+Disable runtime rotation on a `ConfiguredLogger` file sink. This helper is the direct shortcut for clearing rotation policy.
+
+### Interface
+
+```moonbit
+pub fn ConfiguredLogger::file_clear_rotation(self : ConfiguredLogger) -> Bool {}
+```
+
+#### input
+
+- `self : ConfiguredLogger` - Config-driven runtime logger whose rotation policy should be cleared.
+
+#### output
+
+- `Bool` - Whether the policy update was applied.
+
+### Explanation
+
+Detailed rules explaining key parameters and behaviors
+
+- File-backed sinks clear their runtime rotation policy.
+- Queued file sinks forward the update to the wrapped file sink.
+- Non-file sinks return `false`.
+- This helper is equivalent in intent to setting rotation to `None`, but is clearer at the call site.
+
+### How to Use
+
+Here are some specific examples provided.
+
+#### When Need To Disable Rotation Explicitly
+
+When runtime file rotation should be turned off:
+```moonbit
+ignore(logger.file_clear_rotation())
+```
+
+In this example, rotation policy is removed directly.
+
+#### When Need A Clear Intent Shortcut
+
+When code should make the disable-rotation intent obvious:
+```moonbit
+let ok = logger.file_clear_rotation()
+```
+
+In this example, the call site reads more clearly than a generic config setter.
+
+### Error Case
+
+e.g.:
+- If the configured sink is not file-backed, the method returns `false`.
+
+- If callers need to switch to another rotation config rather than disable rotation, `file_set_rotation(...)` is the better API.
+
+### Notes
+
+1. Use this helper when the desired effect is simply “rotation off”.
+
+2. It is clearer than passing `None` through a broader setter when intent matters.