docs: publish legacy feature catalogue

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+---
+title: "3DARCH-FT-22 — Speak with push-to-talk and spatial cues"
+description: "Enable a participant to hold a voice control, grant microphone access, stream speech to the current-floor context, see who is speaking, and hear volume reflect speaker distance."
+---
+
+# Speak with push-to-talk and spatial cues
+
+| Feature | Parent Epic | Delivery status | Status source | Owner | Approved for Solution |
+|---|---|---|---|---|---|
+| `3DARCH-FT-22` | [3DARCH-EP-5 — Communicate in Spatial Context](../../3darch-ep-5.md) | `IN_BACKLOG` | `EXACT` | 3D Architecture Wizzard team | No |
+
+## Description
+
+Enable a participant to hold a voice control, grant microphone access, stream speech to the current-floor context, see who is speaking, and hear volume reflect speaker distance.
+
+## User or operator problem
+
+Participants need hands-busy voice communication with visible speaking state and spatial listening cues.
+
+## Expected value
+
+Adds immediate spoken coordination while preserving floor isolation and distance-aware feedback.
+
+## Scope
+
+Includes push-to-talk capture, permission feedback, current-floor relay, speaking indicators, distance-based volume, and explicit playback recovery.
+
+### Exclusions
+
+- Direct messaging, persistence, history, recording, transcription, and cross-floor communication are excluded.
+
+## Acceptance outcomes
+
+- [ ] Voice capture starts only while the configured push-to-talk action is active.
+- [ ] Microphone denial or unsupported capture produces clear user feedback.
+- [ ] Voice traffic remains isolated to the current floor.
+- [ ] A speaking indicator identifies active speakers.
+- [ ] Playback volume decreases to silence outside the approved proximity range.
+- [ ] Playback can recover after browser autoplay restrictions through an explicit user action.
+
+## Dependencies
+
+- [3DARCH-FT-18 — See who shares the current floor](../../3darch-ep-4/features/3darch-ft-18.md)
+- [3DARCH-FT-20 — Follow coworker movement and activity in real time](../../3darch-ep-4/features/3darch-ft-20.md)
+
+## Risks
+
+- Voice is relayed floor-wide, does not reach silence outside the nominal range, and lacks complete autoplay recovery.
+
+## Human approval
+
+Linas approved this Feature for documentation on 2026-09-02T10:40:43.220Z. It is **not Approved for Solution** and has no implementation approval.
+
+- [Documentation decision](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)
+
+## Delivery status evidence
+
+The Feature was separately registered at `IN_BACKLOG` as an accepted catalogue boundary. This records backlog retention, not design or delivery progress.
+
+- Event: Catalogue registration
+- Actor and authority: Linas — Human project team member
+- Reason: The Feature catalogue was accepted for governed documentation and retained in the backlog.
+- [Status evidence](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)
+
+## Architecture traceability
+
+- Requirements: none derived.
+- Readiness: Not started.
+
+Architecture solution work must not begin until a separate human **Approved for Solution** decision is recorded.
+
+## Tasks
+
+[Review the Tasks group](./3darch-ft-22/tasks.md). No canonical implementation Tasks have been defined.
+
+## Original source
+
+- [Discord – Scope – Linas: original Feature request](https://discord.com/channels/1518726359512387766/1543925247361814568/1544647879111483562)
+- [Discord – Scope – Linas: proceed with documented mapping](https://discord.com/channels/1518726359512387766/1543925247361814568/1544658325738885201)
+
+### Legacy implementation evidence
+
+The Feature boundary was mined from legacy revision `c0ced47ecaf4426f47e5c2e4868677f7144b951a`.
+
+- [`apps/nebula/src/hooks/useVoiceChat.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/hooks/useVoiceChat.ts)
+- [`apps/nebula/src/components/VoiceIndicator.tsx`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/nebula/src/components/VoiceIndicator.tsx)
+- [`apps/singularity/src/socket-server/voice-handler.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/apps/singularity/src/socket-server/voice-handler.ts)
+- [`packages/utils/constants/src/chat.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/packages/utils/constants/src/chat.ts)
+- [`packages/utils/constants/src/controls.ts`](https://gitea.lego-cloud.eu/corp-v1-3darch-legacy/corp-v1-3darch-legacy/src/commit/c0ced47ecaf4426f47e5c2e4868677f7144b951a/packages/utils/constants/src/controls.ts)