fix(elisp-hook): show a compact test summary in the terminal on failure

validate-el.sh dumped the full ERT batch output to the terminal on a red test, every backtrace frame, flooding the pane. It now prints a short summary there: the run tally plus the failing test names and their file:line. Claude still gets the full backtrace through additionalContext. fail_json takes an optional fourth argument for the terminal echo. Paren and byte-compile failures stay short, so they still print in full.

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