SessionVerifier gains a Supabase mode (set SUPABASE_URL): user SATs are ES256,
verified against the project's public JWKS — no shared secret. Keys are fetched at
startup (onModuleInit) and cached as PEM so verify() stays synchronous; a rotated
kid triggers a background refresh. Claims map to MessagePrincipal with userId=email
(stable, human-readable → mentions/directory keep working; RealMDM canonicalises
later). The legacy HS256 app-token path is unchanged (dev/tests untouched).
senderName now prefers the actor display name over the raw handle, so real names
show on bubbles when identity is an email.
Verified end-to-end against a live project: signup → real ES256 SAT → GET /v1/threads
200 → thread created + owned by the resolved email principal. Full suite 182 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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