Add exact-identity target storage adapter

crates/remora-target/Cargo.toml

@@ -0,0 +1,40 @@
+[package]
+name = "remora-target"
+edition.workspace = true
+publish = false
+rust-version.workspace = true
+version.workspace = true
+
+[features]
+default = []
+# Fixture-only helpers (overwrite, version purge). Not for production callers.
+test-utils = []
+
+[dependencies]
+aws-credential-types = "1.2.11"
+aws-sigv4 = "1.3.7"
+bytes = "1.11.1"
+futures-util = "0.3.32"
+http = "1.4.0"
+opendal = { version = "0.58.0", default-features = false, features = [
+    "executors-tokio",
+    "http-transport-reqwest",
+    "http-transport-reqwest-rustls",
+    "services-s3",
+] }
+percent-encoding = "2.3.2"
+quick-xml = { version = "0.38.4", features = ["serialize"] }
+remora-domain.workspace = true
+remora-stream = { path = "../remora-stream" }
+reqwest = { version = "0.12.28", default-features = false, features = [
+    "rustls-tls-webpki-roots",
+] }
+serde = { workspace = true, features = ["derive"] }
+sha2.workspace = true
+thiserror.workspace = true
+tokio = { workspace = true, features = ["macros", "sync", "time"] }
+
+[dev-dependencies]
+remora-target = { path = ".", features = ["test-utils"] }
+sha2.workspace = true
+tokio = { workspace = true, features = ["macros", "rt-multi-thread", "sync", "time"] }