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

Cargo.lock

@@ -3989,13 +3989,10 @@ dependencies = [
  "chrono",
  "csv",
  "deunicode",
- "hayro 0.8.0",
- "hayro-interpret 0.8.0",
- "kurbo",
  "ledger-core",
+ "ledger-reader",
  "proptest",
  "qrcode",
- "quick-xml 0.38.4",
  "rqrr",
  "rust_decimal",
  "rust_xlsxwriter",
@@ -4058,6 +4055,18 @@ dependencies = [
  "zip 9.0.2",
 ]
 
+[[package]]
+name = "ledger-reader"
+version = "0.1.0"
+dependencies = [
+ "hayro 0.8.0",
+ "hayro-interpret 0.8.0",
+ "kurbo",
+ "quick-xml 0.38.4",
+ "thiserror 2.0.21",
+ "zip 9.0.2",
+]
+
 [[package]]
 name = "ledger-store"
 version = "0.1.0"
@@ -4068,7 +4077,7 @@ dependencies = [
  "getrandom 0.2.17",
  "hex",
  "ledger-core",
- "ledger-import",
+ "ledger-reader",
  "libc",
  "proptest",
  "rusqlite",