fix bugs

[tronpis]

Motivation

• Prevent repeated emission of the same lines when LineCapture is used with a regular file path and the file has not actually changed.
• Preserve existing FIFO/named-pipe behavior and keep backoff sleeps cancelable so shutdown remains responsive.

Description

• Add a lightweight file-change gate in readPathLoop that records ModTime and Size and skips reopening regular files when both are unchanged while still bypassing the gate for pipes (os.ModeNamedPipe).
• Split reader logic into scanReader and keep readReader as the one-shot entry that defer-closes the output channel, and use scanReader from the path loop to avoid multiple closers.
• Replace fixed time.Sleep calls with a context-aware sleepWithContext helper so backoff waits respect cancellation.
• Add regression tests TestLineCapturePathReopenStreamsMultipleLines and TestLineCapturePathDoesNotReplayUnchangedFile in modules/audio/line_capture_test.go to verify reopen behavior and that unchanged files do not replay.

Testing

• Ran go test ./... and all packages passed, with modules/audio passing including the new regression tests.
• The new tests TestLineCapturePathDoesNotReplayUnchangedFile and TestLineCapturePathReopenStreamsMultipleLines completed successfully under the test run.

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[kwasham]

PASS: Queue enqueue now drops tasks when full and the new tests cover both fullness and closed states. line_capture now debounces unchanged files, retries on stat/open, and the new tests verify it doesn't replay old content, which improves stability without exposing secrets or auth/RLS surface area. No status checks are configured (statusCheckRollup is empty).