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

crates/ledger-core/src/lib.rs

@@ -61,11 +61,12 @@ pub use periods::{
     CloseTo, MemberClose, MemberCloseRecord, Period, PeriodId, PeriodStatus, RETAINED_EARNINGS_CODE,
 };
 pub use reports::{
-    BalanceSheet, BalanceSheetStatement, CashFlowLine, CashFlowParams, CashFlowStatement,
-    ClassProfitAndLoss, GeneralLedger, LedgerAccount, LedgerPosting, MemberCapital,
-    MemberEquityColumn, MembersEquityStatement, ProfitAndLoss, ProfitAndLossStatement,
-    StatementLine, TrialBalance, TrialBalanceLine, balance_sheet_as_of, cash_flow, general_ledger,
-    members_equity, profit_and_loss_for_period, trial_balance_as_of,
+    AssetRegister, AssetRegisterRow, BalanceSheet, BalanceSheetStatement, CashFlowLine,
+    CashFlowParams, CashFlowStatement, ClassProfitAndLoss, GeneralLedger, LedgerAccount,
+    LedgerPosting, MemberCapital, MemberEquityColumn, MembersEquityStatement, ProfitAndLoss,
+    ProfitAndLossStatement, StatementLine, TrialBalance, TrialBalanceLine, balance_sheet_as_of,
+    cash_flow, fixed_asset_register, general_ledger, members_equity, profit_and_loss_for_period,
+    trial_balance_as_of,
 };
 pub use schedules::{
     AmortizationSchedule, Frequency, NewRecurring, NewSchedule, RecurringEntry, RecurringId,