term: fix the two Kitty suite failures and run the suite by default

Both failures were stale expectations in our copy of the suite.
8c2464c moved the terminal to xterm behavior and added spec tests for
it. The Kitty bridge did not compile then, so nobody updated the suite.

- A cursor report with a pending wrap gives the last column (1;5).
  Kitty gives the start of the next line.
- HT only moves the cursor. Kitty writes a tab cell, which erases the
  text under the tab. REP after the tab then repeats nothing.

The suite went weeks without running, because it needed
-Dkitty_tests=true. Now every unsanitized Linux build runs it in the
unit suite, and the main option only makes it mandatory. The README
lists the deliberate differences from Kitty.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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