GeezerVison

Fixes #282

Problem

When a query returns several columns with the same name (e.g. SELECT * over a join), SQLiteCloudRowset renames them so each SQLiteCloudRow can hold them as object keys. Two bugs:

1. The renaming was backwards. The loop renamed the current column whenever any other column had the same name, so the first id became id_0, the second id_0_1, and only the last kept id. row.id returned the value of the last id column instead of the first.
2. columnsNames didn't match the row keys. The constructor renamed a local copy, but the getter rebuilt names from metadata.columns on every call. Code that read row[name] for each name in columnsNames silently got the last duplicate's value in every duplicate column.

Fix

• Unique names are computed once in the constructor (getUniqueColumnsNames):
  • missing names become column_N (unchanged)
  • the first occurrence keeps its name; later duplicates get _1, _2, …
  • suffixes that already belong to another column are skipped (id, id, id_1 → id, id_2, id_1)
• columnsNames returns those same names (as a copy), so columnsNames + row[name] is consistent with getData().
• New originalColumnsNames getter returns the names exactly as the query returned them, duplicates included.
• slice() / filter() rebuild from metadata, so they get the same names.

⚠️ Behaviour change

• Rows with duplicate column names now use different keys: before { id_0: 7, id: 42 }, now { id: 7, id_1: 42 }.
• columnsNames now returns deduplicated names (and column_N for empty names) instead of the raw metadata names. If you need the raw names, use originalColumnsNames.

Queries without duplicate or empty column names are not affected. This should go in the release notes.

Tests

test/rowset.test.ts:

• offline unit tests: renaming order, columnsNames matching row keys, suffix collisions, missing names, columnsNames returning a copy, and slice/filter
• integration test against chinook with a join that returns duplicate AlbumId/Title columns

Run locally: rowset, row, database, connection-tls, connection-ws suites all pass. tsc is clean.