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/roadmap/future-research.md

@@ -402,5 +402,4 @@ considering the current state of the codebase and the [milestone plan](milestone
 - [Auth, Devices, and Tokens](authz-plan.md) -- OPAQUE integration point
 - [1:1 Channel Design](dm-channels.md) -- double-ratchet optimisation context
 - [Hybrid KEM](../protocol-layers/hybrid-kem.md) -- existing PQ design
-- [ADR-006: PQ Gap in Noise Transport](../design-rationale/adr-006-pq-gap.md) -- accepted PQ risk
 - [References](../appendix/references.md) -- standards and crate documentation