✨ Add file path and auto-flush introspection

bitlogger/BitLogger_test.mbt

@@ -198,11 +198,17 @@ test "configured logger reports dropped_count for bounded queue" {
 test "configured logger exposes file sink observability helpers" {
   let logger = build_logger(
     LoggerConfig::new(
-      sink=SinkConfig::new(kind=SinkKind::File, path="config-file.log"),
+      sink=SinkConfig::new(
+        kind=SinkKind::File,
+        path="config-file.log",
+        auto_flush=false,
+      ),
     ),
   )
   inspect(logger.file_available() == native_files_supported(), content="true")
+  inspect(logger.file_path(), content="config-file.log")
   inspect(logger.file_append_mode(), content="true")
+  inspect(logger.file_auto_flush(), content="false")
   inspect(logger.file_open_failures(), content=if logger.file_available() { "0" } else { "1" })
   inspect(logger.file_write_failures(), content="0")
   inspect(logger.file_flush_failures(), content="0")

bitlogger/BitLogger_wbtest.mbt

@@ -89,8 +89,10 @@ test "native file support flag is queryable" {
 
 test "file sink availability reflects backend support" {
   let sink = file_sink("bitlogger-test.log")
+  inspect(sink.path(), content="bitlogger-test.log")
   inspect(sink.is_available() == native_files_supported(), content="true")
   inspect(sink.append_mode(), content="true")
+  inspect(sink.auto_flush_enabled(), content="true")
   inspect(sink.open_failures(), content=if sink.is_available() { "0" } else { "1" })
   inspect(sink.write_failures(), content="0")
   inspect(sink.flush_failures(), content="0")

bitlogger/README.mbt.md

@@ -222,6 +222,7 @@ test {
 - JSON config uses `sink.rotation.max_bytes` and `sink.rotation.max_backups` / JSON 配置使用 `sink.rotation.max_bytes` 与 `sink.rotation.max_backups`
 - `FileSink::reopen()` can explicitly reopen the current file handle / `FileSink::reopen()` 可显式重开当前文件句柄
 - `append_mode()` exposes the current append policy, and `reopen(append=...)` updates that policy for later reopen calls / `append_mode()` 可读取当前 append 策略，`reopen(append=...)` 会更新后续 reopen 复用的 append 策略
+- `path()` and `auto_flush_enabled()` expose core file sink policy state / `path()` 与 `auto_flush_enabled()` 可读取 file sink 的基础策略状态
 - `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` expose basic sink health counters / `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` 可用于观察基础 sink 健康状态
-- `ConfiguredLogger` also forwards file reopen, flush, close, append-mode, and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen、flush、close、append-mode 与失败计数访问器
+- `ConfiguredLogger` also forwards file reopen, flush, close, append-mode, path, auto-flush, and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen、flush、close、append-mode、path、auto-flush 与失败计数访问器
 - current scope is observability-first, not a full self-healing sink runtime / 当前定位仍以可观测性优先，不是完整自愈型 sink runtime

bitlogger/config.mbt

@@ -239,6 +239,22 @@ pub fn RuntimeSink::file_append_mode(self : RuntimeSink) -> Bool {
   }
 }
 
+pub fn RuntimeSink::file_path(self : RuntimeSink) -> String {
+  match self {
+    File(sink) => sink.path()
+    QueuedFile(sink) => sink.sink.path()
+    _ => ""
+  }
+}
+
+pub fn RuntimeSink::file_auto_flush(self : RuntimeSink) -> Bool {
+  match self {
+    File(sink) => sink.auto_flush_enabled()
+    QueuedFile(sink) => sink.sink.auto_flush_enabled()
+    _ => false
+  }
+}
+
 pub fn RuntimeSink::file_flush(self : RuntimeSink) -> Bool {
   match self {
     File(sink) => sink.flush()
@@ -327,6 +343,14 @@ pub fn ConfiguredLogger::file_append_mode(self : ConfiguredLogger) -> Bool {
   self.sink.file_append_mode()
 }
 
+pub fn ConfiguredLogger::file_path(self : ConfiguredLogger) -> String {
+  self.sink.file_path()
+}
+
+pub fn ConfiguredLogger::file_auto_flush(self : ConfiguredLogger) -> Bool {
+  self.sink.file_auto_flush()
+}
+
 pub fn ConfiguredLogger::file_flush(self : ConfiguredLogger) -> Bool {
   self.sink.file_flush()
 }

bitlogger/sinks.mbt

@@ -118,6 +118,14 @@ pub fn FileSink::append_mode(self : FileSink) -> Bool {
   self.append.val
 }
 
+pub fn FileSink::path(self : FileSink) -> String {
+  self.path
+}
+
+pub fn FileSink::auto_flush_enabled(self : FileSink) -> Bool {
+  self.auto_flush
+}
+
 pub fn FileSink::close(self : FileSink) -> Bool {
   match self.handle.val {
     None => false