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feat(repl): Phase 11.11a REPL .spawn for interactive BEGIN CONCURRENT demos (SQLR-22) (#131)

Lifts the REPL from a single Database to Vec<Connection> so users can mint
sibling handles in-session and step through cross-handle MVCC scenarios.
The prompt now shows the active handle ('sqlrite[A]> ' / 'sqlrite[B]> ')
so it's obvious which connection will execute the next line.

New meta-commands:
- .spawn      Mint a sibling Connection sharing the same Arc<Mutex<Database>>
              via Connection::connect(), then switch to it. Each handle gets
              a stable letter name (A, B, ..., Z, then AA, AB).
- .use NAME   Switch the active handle (case-insensitive); errors with the
              list of valid names on miss.
- .conns      List every handle, mark active with *, tag handles holding
              an open BEGIN CONCURRENT with (BEGIN CONCURRENT).

Plumbing:
- New ReplState in src/repl/mod.rs owns Vec<Connection>, parallel
  Vec<String> of names, and the active index. Exposes lock_active() for
  meta-commands that mutate the underlying Database directly, and
  active_conn_mut() for SQL dispatch through Connection.
- src/main.rs migrates the REPL loop from &mut Database to
  &mut ReplState. SQL dispatch routes through a new
  Connection::execute_with_render which returns CommandOutput (status +
  optional rendered prettytable) instead of a bare String — so BEGIN
  CONCURRENT / COMMIT / ROLLBACK still hit the per-connection MVCC
  state, while SELECTs come back with the prettytable for the REPL to
  print above the status line.
- Connection::concurrent_tx_is_open() promoted from private to public
  so .conns can render per-handle tx state.
- .open collapses every sibling back to a single handle named A —
  siblings pointing at the previous Database would otherwise be
  stranded with stale MVCC state.

Tests:
- 8 new cases in src/meta_command/mod.rs cover .spawn / .use / .conns
  parse + dispatch behaviour, case-insensitive .use, the error mess... (continued)

11148 of 16147 relevant lines covered (69.04%)

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Source Files on job 25662660064.1