fix(interpreter): ${v@a} prints every attribute letter

[chaliy]

Requested by Михайло · project thread

What changed

${v@a} now prints the same attribute letters declare -p shows, in bash's order: a/A, i, n, r, x, l, u. It follows namerefs to their target, a subscript (${f[k]@a}) reports the array, and ${arr[@]@a} repeats the letters once per element.

Why

Bash-oracle gap param-transform-ops. The transform only knew r and x, so integer and array variables reported nothing, which breaks scripts that branch on [[ ${v@a} == *a* ]].

Before / After

$ declare -i n=3; declare -alr b=(X); g=(1 2)
$ echo "${n@a}|${b@a}|${g[@]@a}"
before: ||
after:  i|arl|a a        (bash 5.2: i|arl|a a)

New spec param-attr-transform.test.sh (4 cases, checked against bash 5.2 and by bash_comparison_tests).

Risk

Low; only the @a operator changes. -t and -c are not modeled as attributes, so they still print nothing.

Checklist

• fmt, clippy -D warnings
• integration tests, bash_comparison_tests
• knowledge/log.md

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