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## Summary Allow an issuer to opt into mesh HTTP for its JSON Web Key Set (JWKS). Public HTTPS remains the default. This supports deployments whose service mesh authenticates and protects the key endpoint. The sealed source contract selects transport and contributes to policy identity. Mesh mode requires a DNS hostname and checks every resolved address against an explicit allow-list before pinning one address. Both modes disable proxies, reject redirects, cap responses, and enforce a whole-fetch deadline. The relay cannot verify mesh security: operators must enforce mutual TLS, endpoint authorization, and egress restrictions. ### Related issue No duplicate mesh-JWKS issue or PR found. Existing NIP-FI relay enforcement: #7224. No deployment change is included. ### Testing - At `eccb8cb19420abda44cf6e5e62b1361e2843bd1d`: full auth package and auth/relay all-target clippy passed. Full relay package passed: 1,457 library tests, 37 binary tests, and 9 boot tests; 446 tests were ignored. - At prior head `113939838cd81d5e8d0b0f8783c42ffaae44a4d3`: the full relay library suite failed the demo echo test (1,455 passed, 1 failed, 440 ignored). Independent checks reproduced that timeout at base `d61fe2071d2b3d8e56dd931947f16bfe0d6173fe`; the receive-cancellation defect is outside this change. A later pass does not establish that defect is fixed. - Three falsifying mutations at `eccb8cb194` were caught: mixed DNS answers, proxy bypass, and whole-fetch deadline. The full locked auth package passed after restoring the exact source. - At `eccb8cb194`, `cargo build --locked --release -p buzz-relay -p buzz-cli -p buzz-admin` passed with command-local `CARGO_PROFILE_RELEASE_STRIP=none`. This avoids a macOS loader error without a source, lockfile, or project-profile change. - Earlier hooks failed the ACP signal test and Tauri login-shell PATH test. The ACP failure also reproduced on unmodified main `93ffc37c`. Main merged without conflict. The full Tauri package then passed with `RUST_TEST_THREADS=1`: 3,422 library tests and 3 integration tests, 19 ignored. All pre-push hooks passed with that same command-local setting; no hook or test was skipped. - At `eccb8cb194`, isolated `just test` passed all 107 runner steps. The monolithic `just ci` run timed out after 1,120 seconds; all recipes passed across that run and separate `just desktop-tauri-test`, `just web-build`, and `just mobile-test` invocations. No monolithic pass is claimed. - Exact-head release live-local checks passed: loopback HTTP mesh JWKS warm; valid assertion 101; expired/wrong issuer/wrong audience 403; valid signed disconnect 200; wrong command audience 403. Redirect-only JWKS returned assertion 503 without a request to its target. Both omitted/default and explicit public transport rejected HTTP at startup. - A separate NIP-FI-off release CLI smoke test created an open channel, sent an accepted message, read it back, and fetched its thread. The assertion probe closes after upgrade; it does not prove a complete NIP-42 session. Local loopback tests do not prove deployment mesh authentication, endpoint authorization, egress controls, or real `240/4` routing. Generated with Codex ## Human Testing valid assertion / configured community audience: HTTP 101 (expected 101) expired assertion: HTTP 403 (expected 403) wrong issuer: HTTP 403 (expected 403) wrong community audience: HTTP 403 (expected 403) valid command JWT / configured command audience: HTTP 200, body=b'{"disconnected": true}' (expected 200) valid command signature / wrong audience: HTTP 403 (expected 403) --------- Signed-off-by: seiler <seiler@squareup.com> Signed-off-by: Local Builder <1c476cb1127ea270cb900bdc3891060140bdd1173f91498030ee9b4db01c2f20@buzz.block.builderlab.xyz> Co-authored-by: Codex <noreply@openai.com> Co-authored-by: Local Builder <1c476cb1127ea270cb900bdc3891060140bdd1173f91498030ee9b4db01c2f20@buzz.block.builderlab.xyz>