every.channel: sanitized baseline

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# ECP-0013: stream catalog gossip for discovery
Status: Draft
## Problem
We need a decentralized way to discover live streams and their MoQ endpoints without a central registry.
## Constraints
- Must work over iroh transports (QUIC, relays).
- Should be encrypted at the transport layer and signed by endpoint identities.
- Lightweight enough to broadcast frequently.
## Decision
- Introduce a `StreamCatalogEntry` structure that pairs a `StreamDescriptor` with MoQ transport metadata and optional encryption parameters.
- Publish catalog entries over `iroh-gossip` on a well-known topic derived from `every.channel/catalog/v1`.
- `ec-node` can optionally announce entries when publishing a stream.
## Alternatives considered
- Centralized HTTP registry: rejected due to resilience and governance risks.
- Static peer lists only: rejected due to poor discoverability.
## Rollout / teardown
- Add catalog types to `ec-core` and gossip helpers to `ec-iroh`.
- Add CLI flags to `ec-node` to announce catalog entries.
- Defer full catalog sync/merge semantics until initial interoperability is validated.