docs(linux): correct the roadmap and state each release criterion

[datlechin]

Why

A read-only audit of every ROADMAP row against the code found no false row, but 25 that a reader would misjudge. Some were made stale by #3447 to #3455, some left out limits or engine exceptions, and the Translations row claimed every user-facing string is translated. The release criteria said nothing about where each stands.

Change

• Rows rewritten from the code: import matching, read-only per engine, host keys under StrictHostKeyChecking yes, page sizes and auto count, read-only cells, ClickHouse saves, Copy As, CSV import limits, per-engine structure changes, SQLite rebuilds, script results, drafts, history recording, export scope, session restore, closing and suspend, and the Tests and Translations rows.
• The backlog's timeouts add the server's 60-second statement and 10-second lock limits.
• "More engines" links the full client-library rules in adding-drivers.md instead of ADR 0005 alone.
• Release criteria become a table: what holds today and what each still needs.

Verified

lychee: 0 errors over the Linux docs. Each rewritten row cites code the audit read.