fix(examples): restore the tui-demo pre-boot TTY refusal and stabilize the PTY smoke

The built-bin fail-loud test needs the TTY refusal before Loader boot (a
compose-time throw is logged per-entry, not rethrown); the PTY driver drops
COLORTERM so a developer's truecolor shell cannot flip the banner to the
gradient path mid-assertion; the scripted fixture persists raw JSONL so the
smoke's system-prompt inspection can read the log.

examples/tui-agent/tests/fixtures/tui-scripted.cordis.yml

@@ -21,6 +21,9 @@
     provider: tui-scripted
     model: tui-scripted-model
     persistenceRoot: './.sessions'
+    # The smoke's log inspection reads plain `.jsonl`; keep the scripted
+    # fixture uncompressed like the other snapshot-facing configs.
+    persistenceCompression: none
     workspaceContext:
       maxBytes: 65536
     welcome: 'scripted TUI ready.'