* fix: strip leading whitespace from sanitizeUserFacingText output
LLM responses frequently begin with \n\n, which survives through
sanitizeUserFacingText and reaches the channel as visible blank lines.
Root cause: the function used trimmed text for empty-checks but returned
the untrimmed 'stripped' variable. Two one-line fixes:
1. Return empty string (not whitespace-only 'stripped') for blank input
2. Apply trimStart() to the final return value
Fixes the same issue as #8052 and #10612 but at the root cause
(sanitizeUserFacingText) rather than scattering trimStart across
multiple delivery paths.
* Changelog: note sanitizeUserFacingText whitespace normalization
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>
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Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>
Jake
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