chore: Archive all pending OpenSpec proposals

Force archive the following proposals:
- add-audio-device-selector (complete)
- add-embedded-backend-packaging (19/26 tasks)
- add-flexible-deployment-options (20/21 tasks)

New specs created:
- audio-device-management (7 requirements)
- embedded-backend (8 requirements)

Updated specs:
- transcription (+2 requirements for model download progress)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/specs/audio-device-management/spec.md

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+# audio-device-management Specification
+
+## Purpose
+TBD - created by archiving change add-audio-device-selector. Update Purpose after archive.
+## Requirements
+### Requirement: Audio Device Enumeration
+The frontend SHALL enumerate and display all available audio input devices.
+
+#### Scenario: List available devices
+- **WHEN** user opens meeting detail page
+- **THEN** system SHALL enumerate all audio input devices
+- **AND** display them in a dropdown selector
+- **AND** exclude virtual/system devices like "Stereo Mix"
+
+#### Scenario: Refresh device list
+- **WHEN** user clicks refresh button or device is connected/disconnected
+- **THEN** system SHALL re-enumerate devices
+- **AND** update dropdown options
+- **AND** preserve current selection if still available
+
+#### Scenario: Device label display
+- **WHEN** devices are listed
+- **THEN** each device SHALL display its friendly name (label)
+- **AND** indicate if it's the system default device
+
+### Requirement: Manual Device Selection
+The frontend SHALL allow users to manually select their preferred audio input device.
+
+#### Scenario: Select device from dropdown
+- **WHEN** user selects a device from dropdown
+- **THEN** system SHALL update selected device state
+- **AND** start volume monitoring on new device
+- **AND** save selection to localStorage
+
+#### Scenario: Load saved preference
+- **WHEN** meeting detail page loads
+- **THEN** system SHALL check localStorage for saved device preference
+- **AND** if saved device is available, auto-select it
+- **AND** if saved device unavailable, fall back to system default
+
+#### Scenario: Selected device unavailable
+- **WHEN** previously selected device is no longer available
+- **THEN** system SHALL show warning message
+- **AND** fall back to system default device
+- **AND** prompt user to select new device
+
+### Requirement: Real-time Volume Indicator
+The frontend SHALL display real-time audio input level from the selected microphone.
+
+#### Scenario: Display volume meter
+- **WHEN** a device is selected
+- **THEN** system SHALL show animated volume meter
+- **AND** update meter at least 10 times per second
+- **AND** display level as percentage (0-100%)
+
+#### Scenario: Volume meter accuracy
+- **WHEN** user speaks into microphone
+- **THEN** volume meter SHALL reflect actual audio amplitude
+- **AND** peak levels SHALL be visually distinct
+
+#### Scenario: Muted or silent input
+- **WHEN** no audio input detected for 3 seconds
+- **THEN** volume meter SHALL show minimal/zero level
+- **AND** optionally show "No input detected" hint
+
+### Requirement: Audio Test Recording
+The frontend SHALL allow users to record a short test audio clip.
+
+#### Scenario: Start test recording
+- **WHEN** user clicks "Test Recording" button
+- **THEN** system SHALL start recording from selected device
+- **AND** button SHALL change to "Stop" with countdown timer
+- **AND** recording SHALL auto-stop after 5 seconds
+
+#### Scenario: Stop test recording
+- **WHEN** recording reaches 5 seconds or user clicks stop
+- **THEN** recording SHALL stop
+- **AND** audio blob SHALL be stored in memory
+- **AND** "Play Test" button SHALL become enabled
+
+#### Scenario: Recording indicator
+- **WHEN** test recording is in progress
+- **THEN** UI SHALL show recording indicator (pulsing dot)
+- **AND** remaining time SHALL be displayed
+
+### Requirement: Test Audio Playback
+The frontend SHALL allow users to play back their test recording.
+
+#### Scenario: Play test recording
+- **WHEN** user clicks "Play Test" button
+- **THEN** system SHALL play the recorded audio through default output
+- **AND** button SHALL change to indicate playing state
+- **AND** playback SHALL stop at end of recording
+
+#### Scenario: No test recording available
+- **WHEN** no test recording has been made
+- **THEN** "Play Test" button SHALL be disabled
+- **AND** tooltip SHALL indicate "Record a test first"
+
+### Requirement: Integration with Main Recording
+The main recording function SHALL use the user-selected audio device.
+
+#### Scenario: Use selected device for recording
+- **WHEN** user starts main recording
+- **THEN** system SHALL use the device selected in audio settings panel
+- **AND** if no device selected, use auto-selection logic
+
+#### Scenario: Device changed during recording
+- **WHEN** user changes device selection while recording
+- **THEN** change SHALL NOT affect current recording
+- **AND** new selection SHALL apply to next recording session
+
+### Requirement: Audio Settings Panel UI
+The frontend SHALL display audio settings in a collapsible panel.
+
+#### Scenario: Panel visibility
+- **WHEN** meeting detail page loads
+- **THEN** audio settings panel SHALL be visible but collapsible
+- **AND** panel state (expanded/collapsed) SHALL be saved
+
+#### Scenario: Panel layout
+- **WHEN** panel is expanded
+- **THEN** it SHALL display:
+  - Device dropdown selector
+  - Volume meter visualization
+  - Test recording button
+  - Play test button
+  - Status indicator
+
+#### Scenario: Compact mode
+- **WHEN** panel is collapsed
+- **THEN** it SHALL show only selected device name and expand button
+