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-store/src/schema.rs

@@ -5,7 +5,7 @@
 //! is the current version.
 
 /// Current schema version.
-pub const SCHEMA_VERSION: u32 = 8;
+pub const SCHEMA_VERSION: u32 = 9;
 
 /// Migrations, in order. `MIGRATIONS[i]` migrates from version `i` to `i+1`.
 pub const MIGRATIONS: &[&str] = &[
@@ -207,5 +207,18 @@ ALTER TABLE attachments ADD COLUMN mime_type TEXT;
 UPDATE attachments SET
   file_name = (SELECT original_name FROM blobs WHERE sha256 = attachments.blob_sha),
   mime_type = (SELECT mime_type FROM blobs WHERE sha256 = attachments.blob_sha);
+"#,
+    r#"
+-- v9: asset tags, serial numbers, and each asset's acquisition entry. assets.tag is the current tag;
+-- asset_tags_log keeps every tagging in journal order, because a tag is
+-- never reused by another asset even after a retag.
+ALTER TABLE assets ADD COLUMN tag TEXT;
+ALTER TABLE assets ADD COLUMN serial TEXT;
+ALTER TABLE assets ADD COLUMN acquisition_entry INTEGER;
+CREATE TABLE IF NOT EXISTS asset_tags_log(
+  seq INTEGER PRIMARY KEY AUTOINCREMENT,
+  asset_id INTEGER NOT NULL,
+  tag TEXT NOT NULL
+);
 "#,
 ];