Release 1.6.0

[skitsanos]

Release 1.6.0

Added

• Deepgram provider support with Nova-3/Nova-3 Medical, provider-native diarization, word timestamps, keyterms, and audio intelligence metadata.
• Gemini signed URL input mode via --gemini-use-presigned-url for S3/R2 staged one-off inputs.
• Generic --autoclean / TRANSCRIBEIT_AUTOCLEAN for best-effort cleanup of temporary provider resources.
• S3/R2 staged-object cleanup metadata for Qwen, Gemini signed URL mode, and Deepgram signed URL mode.

Improved

• Clean remote-provider benchmark comparison across Deepgram, Qwen, OpenAI, Gemini, and NVIDIA Riva.
• Provider documentation for URL input support, cleanup behavior, Gemini cache behavior, and Deepgram intelligence metadata.

Validation

• ./scripts/check.sh passed.
• cargo clippy --all-targets -- -D warnings passed.