feat(a2a-bridge): wire inbound HTTPS route, production main, and NATS transport harness (#382)

Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>

Author: yordis

rsworkspace/Cargo.lock

@@ -6,6 +6,10 @@ license = "Apache-2.0"
 description = "HTTPS ↔ NATS A2A sidecar: caller identity, error surface, and routing scaffolds"
 publish = false
 
+[[bin]]
+name = "a2a-bridge"
+path = "src/main.rs"
+
 [lib]
 name = "a2a_bridge"
 path = "src/lib.rs"
@@ -16,15 +20,21 @@ workspace = true
 [dependencies]
 a2a-auth-callout = { workspace = true }
 a2a-nats = { workspace = true }
-async-nats = { workspace = true }
+async-nats = { workspace = true, features = ["jetstream"] }
 async-trait = { workspace = true }
+axum = { workspace = true }
 bytes = { workspace = true }
+futures-util = { workspace = true }
 reqwest = { workspace = true, features = ["json", "rustls-tls"] }
 serde_json = { workspace = true }
 thiserror = { workspace = true }
-tokio = { workspace = true, features = ["rt-multi-thread", "macros", "sync"] }
+tokio = { workspace = true, features = ["rt-multi-thread", "macros", "signal", "sync"] }
+tracing = { workspace = true }
+tracing-subscriber = { version = "=0.3.23", features = ["fmt", "env-filter"] }
 
 [dev-dependencies]
+futures-util = { workspace = true }
 nkeys = { workspace = true }
 serde_json = { workspace = true }
 tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
+trogon-nats = { workspace = true, features = ["test-support"] }

rsworkspace/crates/a2a-bridge/Cargo.toml

@@ -7,6 +7,8 @@ use async_trait::async_trait;
 
 use a2a_auth_callout::{BridgeMintRequest, BridgeMintResponse};
 
+#[cfg(test)]
+pub(crate) use callout_mint::harness_callout_dispatcher;
 pub use callout_mint::{BridgeTenantAccount, InProcessCalloutDispatcherMintWire};
 
 use crate::error::BridgeError;

rsworkspace/crates/a2a-bridge/src/auth.rs

@@ -31,6 +31,8 @@ pub enum BridgeError {
     CatalogRegistration(String),
     #[error("invalid agent identifier: {0}")]
     InvalidAgent(String),
+    #[error("failed to build HTTP response: {0}")]
+    ResponseBuild(String),
 }
 
 #[cfg(test)]