SPEC v0.7: M9 importer decisions (D-044 to D-046), category table, HANDOFF rewritten

D-044 adds nine Swedish Splitwise category names to the SPEC §10.8 table and
splitwise_categories.csv. D-045 records the reconciliation against the totals
rows; D-046 the importer CLI semantics and exit codes. M9 marked landed at
ab298ab, the M11 rehearsal recorded, server/README.md and prompts/README.md
updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

docs/decisions.md

@@ -48,3 +48,6 @@ entry and the old one a strike-through plus a pointer. The spec is updated in th
 | D-041 | 2026-10-17 | `:data`'s `DataModule` provides implementations only; the interface bindings live in `DataBindingsModule` (`@DisableInstallInCheck`), which `:app` includes for release so the debug fakes do not duplicate bindings. (M5's D-031, renumbered.) | M5 report: Hilt fails on duplicate bindings when debug binds fakes. | SPEC §6.2, §11.3 (M8); PLAN-M8 |
 | D-042 | 2026-10-17 | Room tests run on Robolectric with the framework SQLite driver; migration tests build from the exported schema JSON rather than `room3-testing`. (M5's D-032, renumbered.) | M5 report: no device needed for the gate. | SPEC §6.2 |
 | D-043 | 2026-10-17 | Two extra DataStore keys: the pairing status in `auth.preferences_pb`, and the installed version code that received a 426 in `prefs.preferences_pb` (syncing stops until the installed version changes). The token is encrypted with Keystore key `kvitt_token_key`, AES-256-GCM (as §8.2). (M5's D-033, renumbered.) | M5 report. | SPEC §8.2, §14.2.2, §14.4.5 |
+| D-044 | 2026-10-18 | Nine Swedish Splitwise category names, found unmapped in the importer rehearsal on the real Swedish export, are added to the §10.8 table and to `server/crates/kvitt-import/data/splitwise_categories.csv` with the key of their English equivalent: Städning → `utilities` (Cleaning); Verktyg - Övrigt → `utilities` (Utilities - Other); Tjänster → `home` (Services); Cykel → `transport` (Bicycle); Flyg → `travel` (Plane); Spel → `entertainment` (Games); Kläder → `shopping` (Clothing); Livet - Övrigt → `other` (Life - Other); Utbildning → `other` (Education). The test `category_table_matches_the_spec` keeps the two in step. | The rehearsal of 2026-10-18 left 21 rows of the Vardag file as `other`, counted unmapped, only because these names were missing from D-003's table. | SPEC §10.8; `server/crates/kvitt-import/data/splitwise_categories.csv` |
+| D-045 | 2026-10-18 | Import reconciliation. Inside the import transaction, after the rows are written, each user's balance of the whole account (`net(u)`, §9.3) must equal the sum of that member's values in the file's totals rows (`Total balance` / `Totalsumma`), one totals row allowed per currency, a non-SEK one converted with its `--fx` rate. A mismatch or a missing totals row rolls the run back and exits 4; a dry run reports the same. The comparison covers the whole account, so importing into an account that already holds other rows rolls back. When any `--fx` conversion took place, a mismatch is reported in the summary but accepted (per-value rounding can make an exact match impossible). | M9 report (`ab298ab`): v0.6 ignored the totals row, and M11's gate ("imported balances equal Splitwise's totals") is cheapest checked by the importer itself, before anything is committed. | SPEC §10.8, AC-17.5, §11.2 (M11) |
+| D-046 | 2026-10-18 | Importer CLI semantics. `--user <Splitwise name>=<user>` takes a user id or an exact display name that exactly one user has; the two arguments must name the two household users. The importer never creates or migrates a database and requires `meta.schema_version` = `1`. A dry run runs the full transaction and rolls it back. Exit codes: 0 ok, 1 database or file error, 2 usage, 3 cannot import (header, invalid rows, non-SEK without `--fx`), 4 reconciliation mismatch. The import key uses an existing account's stored name, so a re-run with another spelling finds its rows. An empty description or one over 1000 code points makes the row invalid; a description over 100 code points is cut with the full text in `notes`; settlement notes are cut to 200 code points; both nets zero means the owner pays in mode `full`. Idempotency uses the existing `import_key` columns; no schema change. | M9 report (`ab298ab`): §10.8 left the user lookup, database handling, dry-run mechanics, exit codes and these edge cases open. | SPEC §10.8, AC-17.5; server/README.md |