Make basic example safe for non-interactive runs

[prateekbhujel]

Summary

• make examples/basic.php skip raw-mode and secret-input demos when stdin is not a terminal
• add PHPT coverage for the non-interactive basic example path
• record the recent post-release maintenance in CHANGELOG.md

Validation

• php -l examples/basic.php examples/streams.php examples/doctor.php examples/prompt.php
• Composer 2.9.8 validate --strict --no-check-lock
• git diff --check
• XAMPP PHP 8.2 x86_64 build from /private/tmp with -Wall -Wextra
• make test REPORT_EXIT_STATUS=1 NO_INTERACTION=1 TEST_PHP_EXECUTABLE=/Applications/XAMPP/xamppfiles/bin/php -> 34 total, 31 passed, 3 skipped, 0 failed
• examples/basic.php run against the built extension in non-interactive mode

Closes #49
Closes #50