P2 slice 5: files in and out

Files reach the books through the server: uploads by hash and size,
then filed; exports (the CPA package, the 1099 worksheet, W-9s) handed
over as downloads from the server, never read off disk by the agent.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj

crates/ledger-store/src/auth.rs

@@ -168,6 +168,10 @@ impl From<ChainError> for AuthError {
     }
 }
 
+/// A token's name when none is given (`wanderbooks token create`, the
+/// bridge, `upload`, `download`).
+pub const DEFAULT_NAME: &str = "agent";
+
 /// Check a token's name: 1 to 32 lowercase letters, digits and hyphens,
 /// starting with a letter or digit.
 pub fn check_name(name: &str) -> Result<(), AuthError> {

crates/ledger-store/src/lib.rs

@@ -32,6 +32,7 @@ pub mod root;
 pub mod schema;
 pub mod snapshot;
 pub mod store;
+pub mod uploads;
 pub mod viewer;
 
 pub use blob::BlobStore;