Remove Noise protocol references from wiki docs and tests

Delete 8 Noise-specific documentation pages (noise-xx.md,
transport-keys.md, adr-001/003/006, framing-codec.md) and update
~30 remaining wiki pages to reflect QUIC+TLS as the sole transport.
Remove obsolete Noise-based integration tests (auth_service.rs,
mls_group.rs). Code-side Noise removal was done in f334ed3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/src/wire-format/node-service-schema.md

@@ -252,7 +252,6 @@ Cap'n Proto supports forward-compatible schema evolution through several mechani
 - [Auth Schema](auth-schema.md) -- standalone Authentication Service interface (subset of NodeService)
 - [Delivery Schema](delivery-schema.md) -- standalone Delivery Service interface (subset of NodeService)
 - [Envelope Schema](envelope-schema.md) -- legacy M1 framing that NodeService replaced
-- [Framing Codec](framing-codec.md) -- length-prefixed framing used in the Noise transport path
 - [Architecture Overview](../architecture/overview.md) -- system-level view showing NodeService in context
 - [ADR-005: Single-Use KeyPackages](../design-rationale/adr-005-single-use-keypackages.md) -- why fetchKeyPackage is destructive
 - [ADR-004: MLS-Unaware DS](../design-rationale/adr-004-mls-unaware-ds.md) -- why payloads are opaque