feat: M3.7.7 signature extraction CLI + integration tests (unit tests pass, integration tests pending mem-cli fix)

Cargo.toml

@@ -42,6 +42,7 @@ sqlx = { version = "0.7", features = ["postgres", "runtime-tokio-rustls", "chron
 pgvector = { version = "0.2", features = ["sqlx"] }
 base64 = "0.21"
 jsonwebtoken = "9.2"
+regex = "1.10"
 
 [dev-dependencies]
 toml = { workspace = true }
@@ -60,6 +61,7 @@ actix-web = { workspace = true }
 actix-rt = { workspace = true }
 wiremock = "0.6"
 chrono = { version = "0.4", features = ["serde"] }
+regex = { workspace = true }
 
 [profile.release]
 opt-level = 3