spec: allow selecting microphone input device for voice commands

[oz-for-oss]

Summary

• Adds a product spec for selecting a microphone/input device for Warp Voice in Settings > Agents > Warp Agent > Voice.
• Adds a tech spec grounded in the current Settings and voice_input code paths, covering local-only settings persistence, audio device enumeration/resolution, Settings UI, unavailable-device errors, validation, and rollout risks.

Validation

• Ran git diff --check for the new spec files.

Related issue: #10931

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[oz-for-oss]

Overview

This PR adds product and technical specs for selecting a microphone input device for Warp Voice. The specs cover the expected user behavior, local-only persistence, audio-device enumeration and resolution, Settings UI changes, unavailable-device handling, privacy constraints, rollout, and validation.

Concerns

• No blocking completeness, clarity, feasibility, issue-alignment, internal-consistency, or high-level security concerns found in the changed spec lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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