FCE-2316 Document noise cancellation and auto gain

[roznawsk]

What

Documents the audio-processing constraints (echo cancellation, noise suppression / noise cancellation, and auto gain control) for the web client SDK — closes FCE-2316.

Adds an Audio processing: noise cancellation and auto gain section to docs/how-to/client/managing-devices.mdx (Web/Mobile tabs):

• Explains they are enabled by default and when to disable them (raw audio: music, instruments, custom processing).
• Web: how to set them explicitly via the constraints prop on FishjamProvider, with enable + raw-audio examples; notes selectMicrophone/startMicrophone reuse the provider constraints.
• Mobile: enabled by default in the native pipeline, not currently configurable from JS.

Note on the issue premise

FCE-2316 said "we disable them by default", but main of web-client-sdk never sets these constraints (passes audio: true → browser defaults, which are on), and mobile-client-sdk hardcodes them to true natively. So the docs describe the actual behavior (enabled by default) rather than the issue's wording.

Verification

• cspell: clean
• Internal cross-link FishjamProviderProps#constraints resolves

[linear]

FCE-2316

[Copilot]

Pull request overview

Documents how built-in audio processing (echo cancellation, noise suppression, auto gain control) behaves and how to configure it for the client SDK device-management guide, clarifying defaults and when to prefer raw audio.

Changes:

• Adds a new “Audio processing” section describing defaults and tradeoffs for speech vs. raw audio capture.
• Provides Web-specific examples for setting FishjamProvider constraints, plus a note about how selectMicrophone/startMicrophone relate to provider constraints.
• Documents Mobile behavior as enabled-by-default in the native pipeline and not currently configurable from JS.

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