Fixed assets, fully featured: tags, serials, acquisition links, label sheets, the fixed asset register, and an Assets section in the viewer; fix a flaky verify

- core: asset tags (generated PREFIX-0001 or the human's own; unique ignoring case; never reused by another asset) and serial numbers (rules.md B-24); a journaled link from an asset to the entry that acquired it (posted, unreversed, debiting the cost account); fixed_asset_register(as_of), reconciled to the GL (unposted depreciation, unregistered cost)
- store: asset.tagged, asset.serial_set, asset.acquisition_linked journaled, replayed, projected (schema v9); differs_from now also compares control roles and tag history
- config: [books] asset_tag_prefix, default the company's initials without legal-form words
- import: Avery 5160/8160 label sheets with QR codes (geometry vendored from Avery, docs/spec/sources/avery-5160.md); the register as XLSX and PDF
- mcp: register_asset tags (and links) automatically; books.label_asset, books.asset_labels; asset tools take a tag; books.show asset / assets page / register report; export fixed_asset_register (json, csv, xlsx, pdf) and in the CPA package
- viewer: Assets page (register, reconciliation), asset page (identity, schedule posted vs not, entries, documents), Fixed asset register report, global search by tag/serial/description, journal text, needs-attention items
- fix: verify compared snapshot amounts as strings; a zero total summed in hash-map order could print "0" or "0.00", so agreeing books failed verify at random. Now by value (regression test)
- tests: spec-blind suites for tags, register, prefix, store, MCP; label and register PDF/XLSX tests; viewer tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

Cargo.lock

@@ -2261,6 +2261,34 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "g2gen"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5a7e0eb46f83a20260b850117d204366674e85d3a908d90865c78df9a6b1dfc"
+dependencies = [
+ "g2poly",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "g2p"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "539e2644c030d3bf4cd208cb842d2ce2f80e82e6e8472390bcef83ceba0d80ad"
+dependencies = [
+ "g2gen",
+ "g2poly",
+]
+
+[[package]]
+name = "g2poly"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "312d2295c7302019c395cfb90dacd00a82a2eabd700429bba9c7a3f38dbbe11b"
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -3663,6 +3691,8 @@ dependencies = [
  "csv",
  "ledger-core",
  "proptest",
+ "qrcode",
+ "rqrr",
  "rust_decimal",
  "rust_xlsxwriter",
  "serde",
@@ -3833,6 +3863,15 @@ version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f9f8bd3e56ce4dfc153cf470fffbfa98c7620958b312ca5c3a4b8d5181fd13c6"
 
+[[package]]
+name = "lru"
+version = "0.18.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef9ac18847474e638e3702b76c65d4eb93428471a74778ef0f1be711717f89b5"
+dependencies = [
+ "hashbrown 0.17.1",
+]
+
 [[package]]
 name = "lzma-rust2"
 version = "0.21.0"
@@ -5045,6 +5084,12 @@ version = "0.1.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d55d956fa96f5ec02be2e13af0e20391a5aa83d6a074e3ad368959d0fab299ea"
 
+[[package]]
+name = "qrcode"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d68782463e408eb1e668cf6152704bd856c78c5b6417adaee3203d8f4c1fc9ec"
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
@@ -5517,6 +5562,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "rqrr"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d084c50c5cfa397a081850da329566c8667b0b6c4e81da16abff1fef27de93b"
+dependencies = [
+ "g2p",
+ "lru",
+]
+
 [[package]]
 name = "rusqlite"
 version = "0.32.1"