fix: resolve review #004 findings W1-W4 + close review gate

W1 (call/protocol/abort-cascade-wiring): wire AbortCascade into
CallAdapter handle_stream for EVENT_ABORTED. Cascades with
AbortPolicy::AbortDependents, aborts root, no descendant frames on
wire (ADR-016 Decision 2). Two integration tests added.

W2 (core/endpoint-client-fingerprint): extract TLS client cert
fingerprint in dispatch_quinn (SHA256:<hex> of leaf cert DER via
peer_identity) and dispatch_iroh (ed25519:<hex> of peer NodeId).
Fingerprint format documented in auth.md. Server config change
(with_no_client_auth → request-but-don't-require) deferred to new
follow-up task core/endpoint-request-client-cert.

W3 (vault/mnemonic-debug-redaction): replace Mnemonic derive(Debug)
with manual redacting impl (phrase: "[REDACTED]"). Seed confirmed
no Debug impl. Redaction test added.

W4 (core/auth-apikey-resources): Option B — drop entry.resources from
spec. External identities (token/fingerprint) grant scopes only;
resource-scoped ACLs are composition-internal (ADR-015/022). auth.md
corrected + limitation documented. Two tests confirm empty resources.

review-post-impl-fixes: all 4 verified, workspace green (326 tests,
0 failures, 0 clippy warnings). Review #004 status → resolved.

Graph: 34 tasks, 12 gens.

tasks/call/protocol/abort-cascade-wiring.md

@@ -1,7 +1,7 @@
 ---
 id: call/protocol/abort-cascade-wiring
 name: Wire AbortCascade into CallAdapter inbound event path (ADR-016)
-status: pending
+status: completed
 depends_on: [call/protocol/abort-cascade]
 scope: narrow
 risk: medium
@@ -127,4 +127,14 @@ frame actually reaches `cascade_abort`.
 > criteria likewise omitted "inbound `call.aborted` triggers cascade."
 > This task closes that integration gap — all the hard logic already
 > exists and is tested; this task adds the ~30-line bolt and the one
-> integration test that would have caught the gap.
+> integration test that would have caught the gap.
+
+## Summary
+
+`handle_stream` now matches `EVENT_ABORTED` → invokes
+`AbortCascade::cascade_abort` with `AbortPolicy::AbortDependents`, then
+aborts the root. Non-requested/non-aborted events still log at `debug!`.
+No descendant `call.aborted` frames sent on the wire. Two integration
+tests: cascade removes parent + child from `PendingRequestMap`; unknown
+request_id is a no-op. `cargo test -p alknet-call` (161 tests) and
+clippy clean.