ECP-0015: Gossip announce toggle and bootstrap peers

Status

Draft

Context

Sharing a stream should optionally announce it into the global catalog so other nodes can discover it. Today gossip requires explicit peers, and there is no UI surface for managing announcements.

Decision

Add an "Announce on share" toggle and a "Gossip peers" field to the viewer UI. When enabled, the app sends a catalog announcement over iroh-gossip immediately after a share begins. Peers can be supplied in-app or via EVERY_CHANNEL_GOSSIP_PEERS (comma-separated).

Details

start_moq_publish accepts announce and gossip_peers.
If announce is true and no peers are provided, we fall back to EVERY_CHANNEL_GOSSIP_PEERS.
The share card surfaces announce status (announced / error).

Consequences

Announcements remain opt-in and require at least one peer.
Users can keep their share local by leaving announce off.

Follow-ups

Add local peer discovery via mDNS to remove manual peer entry for LANs.
Add public bootstrap peer lists and relay selection once governance approves.

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