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* fix(workflows): quote-aware interpolation so a literal }} in a filter arg doesn't break multi-expression templates
#3208/#3228 hardened the single-expression fast path (_is_single_expression)
so a literal {{ or }} inside a string argument like `| default('}}')` stays on
the typed path. the multi-expression interpolation path was left on the old
_EXPR_PATTERN regex, whose non-greedy `(.+?)}}` body stops at the first }}
regardless of quoting. so a multi-expression template with a literal }} in any
block captured a truncated body, hit the filter parser malformed, and raised
ValueError.
e.g. `{{ inputs.name }}: {{ inputs.missing | default('}}') }}` raised instead
of interpolating.
replace _EXPR_PATTERN.sub with _interpolate_expressions, which scans each block
for a }} outside string literals - the same quote handling _is_single_expression
already uses. plain-value passthrough (a literal }} in a resolved value, not an
expression) is unchanged.
add regression tests for a literal }} in the second block and in the first
block, plus a literal {{ guard.
* fix(workflows): surface malformed templates in interpolation instead of emitting verbatim
address copilot review on #3307: when the quote-aware scan finds no block-closing
`}}` (e.g. an unbalanced quote in a filter arg swallowed the delimiter), fall back
to the first raw `}}` in the tail and evaluate it, so the parser raises ValueError
just as the old _EXPR_PATTERN.sub path did. only when there is no `}}` at all is
the tail left verbatim (a genuinely unterminated `{{`, which the regex also could
not match). keeps a typo failing loudly rather than being silently hidden.
add a regression test for an unbalanced quote in a multi-expression template.