fix: Windows reads of lock files, update paths cfg(unix), merge main again (P11c)

spec_vault swept every file under a book, lock files included; on Windows
a held LockFileEx lock is mandatory and the read failed. The locks are
already dedicated files (never data), so the test skips *.lock. Merged
main (P13 step 6, the macOS server.log assert, P11a's AppImage identity):
host.rs keeps main's five-field identity on Unix and size/last-write on
Windows; the update poll and set_program_version are Unix-only.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

crates/ledger-store/src/lib.rs

@@ -23,6 +23,7 @@ pub mod auth;
 pub mod backup;
 pub mod blob;
 pub mod chain;
+pub mod describe;
 pub mod error;
 pub mod exports;
 pub mod form1099;
@@ -49,6 +50,7 @@ pub use error::StoreError;
 pub use format::{FormatUpgrade, JournalFormat, SUPPORTED_JOURNAL_FORMAT};
 pub use journal::{GENESIS_PREV, JournalLine, JournalWriter};
 pub use snapshot::{DiskCheck, Snapshot};
+pub use store::audit;
 pub use store::{
     Attachment, BillPreview, DepreciationRun, DisposalPreview, EntryRow, EventRow, Extraction,
     ExtractionStatus, InvoicePreview, JOURNAL_FILE, LEGACY_DB_FILE, LOCK_FILE, MAX_RECURRING_RUN,