feat: Add Post Call Transcription to Archives

[superchilled]

This PR updates the implementation for the Archives feature in order to add support for post-call transcription.

[vonage-ai-assistant]

AI Adoption Report

	Lines	%
AI-generated	10	100%
Human	0	0%
Untracked	97	—
Total	107

💰 Cost Breakdown

Agent	Model	AI Lines	Input Tokens	Output Tokens	Cost	Source
GitHub Copilot	github-copilot	10	112	34	$0.0000	🤖 Copilot (subscription)

Total Estimated Cost: $0.0000

Data Sources:

• 📐 3 commits with estimated tokens (~3.5 tokens/line)

Bedrock pricing: eu-central-1 region

Per-commit breakdown (7 commits)

Commit	Message	Added	AI	Human	AI %
3b896b8	Only include hasTranscription and transcriptionProperties in	5	5	0	🤖 100% (Copilot)
8b99a8e	Potential fix for pull request finding	1	1	0	🤖 100% (Copilot)
109c596	Potential fix for pull request finding	4	4	0	🤖 100% (Copilot)
559568f	Updating doc blocks for transcription properties	8	—	—	untracked
429c330	Updating Archives.init	2	—	—	untracked
ba484f0	Updating start_archive method	15	—	—	untracked
c5736c1	Adding unit test for archive with transcription params	72	—	—	untracked

Warning

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• 559568f Updating doc blocks for transcription properties
• 429c330 Updating Archives.init
• ba484f0 Updating start_archive method
• c5736c1 Adding unit test for archive with transcription params

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[Copilot]

Pull request overview

This PR extends the Archives feature to support post-call transcription by adding transcription parameters to start_archive, parsing transcription-related fields onto the Archive model, and validating the behavior via a new unit test.

Changes:

• Added has_transcription and transcription_properties parameters to OpenTok.start_archive() and included them in the archive start request payload.
• Extended Archive to expose has_transcription and transcription_properties from the API response.
• Added a new test covering archive creation with transcription enabled and verifying request/response handling.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/test_archive_api.py	Adds coverage for starting an archive with transcription enabled and validating request/response fields.
opentok/opentok.py	Adds new transcription-related parameters and payload fields to start_archive, plus corresponding docstring updates.
opentok/archives.py	Adds transcription-related fields to the Archive model initialization.

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