P2 slice 4: access

Agent tokens (wb_ and 64 hex digits), one book and one name each, kept
only as SHA-256 in a chain log and in the OS keyring; made, listed and
revoked only through the admin socket (`wanderbooks token ...`). The
door checks them, scopes cover every tool, every call is in the access
log (fail closed), and the owner passphrase is an Argon2id hash.
Setup's terminal test waits for its prompts.

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

crates/ledger-store/src/lib.rs

@@ -18,11 +18,15 @@
 //! `last_applied_seq`. There is exactly one writer: `Store` is `!Sync` by
 //! construction (it owns a `rusqlite::Connection`).
 
+pub mod access;
+pub mod auth;
 pub mod blob;
+pub mod chain;
 pub mod error;
 pub mod format;
 pub mod journal;
 pub mod meta;
+pub mod passphrase;
 pub mod reconcilable;
 pub mod root;
 pub mod schema;