refactor(reader): extract.rs moves into ledger-reader (U0d)

D-61 (Q-9): the writer sheds the typesetter and the crate map is layered
again. The PDF/XLSX reader (extract.rs, plan P6) is now the plain library
crate ledger-reader, moved whole with git mv and no behavior change.
ledger-store depends on it instead of ledger-import, so the store no
longer builds Typst or the fonts; ledger-import re-exports it as
ledger_import::extract so gui, mcp, host and the fuzz targets compile
unchanged, and still never depends on the store. New crate carries only
the dependencies extract.rs imports (hayro, hayro-interpret, kurbo, zip,
quick-xml, thiserror); fuzz/Cargo.lock gains the new package.

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

plan/served.md

@@ -1299,7 +1299,7 @@ Each unit follows the 8.0.4 template. "A-n" is an owner answer numbered in 8.3.1
 5. **Files:** owns `crates/ledger-reader/`; touches `crates/ledger-import/{Cargo.toml,src/lib.rs}`, `crates/ledger-store/Cargo.toml`, `crates/ledger-store/src/store.rs` (imports only), `Cargo.toml` (workspace members), the two fuzz targets' manifest, `docs/architecture.md`, `docs/testing.md`.
 6. **Tests and proofs:** no new test: the move is behavior-preserving, and P6's `extraction_deterministic`, `xlsx_cells_are_decimal_strings`, `a_pdf_that_crashes_the_reader_is_failed_not_fatal` move with the module and pass unchanged; `fuzz_extract_pdf` and `fuzz_extract_xlsx` build. No kernel, Kani or Lean change.
 7. **Done when:** (1) `cargo tree -p ledger-store -e normal` shows no `typst*` and no `ledger-import`; (2) `cargo tree -p ledger-import -e normal` shows no `ledger-store` (as today); (3) the three P6 extraction tests and the two fuzz targets pass where they now live; (4) `docs/architecture.md` has no "under review" sentence; (5) the batch's gate (D-60) green.
-8. **As built:** none yet.
+8. **As built:** `extract.rs` moved whole (`git mv`) to `crates/ledger-reader/src/lib.rs`; the new crate depends on `thiserror`, `hayro`, `hayro-interpret`, `kurbo`, `zip`, `quick-xml` only. `ledger-import` drops those (keeps `zip` as a dev-dependency for its test) and re-exports the crate with `pub use ledger_reader as extract;`, so `ledger_import::extract::*` still works for `ledger-gui`, `ledger-mcp`, `ledger-host` and the two fuzz targets (no caller changed). `ledger-store` depends on `ledger-reader` instead of `ledger-import`; `store.rs` and `tests/attachments.rs` use `ledger_reader::`. The three P6 tests stay in `crates/ledger-import/tests/extract.rs` (they build their PDFs with `ledger-import`'s statement writer; moving them would need a dev-dependency cycle) and pass through the re-export; the two unit tests moved with the module. `docs/architecture.md`, `docs/testing.md`, `AGENTS.md` updated.
 
 #### P4b S4: `documents_v2`