Vale locates a frontmatter description by matching the parsed YAML value back
against the source text, so any scalar whose value is not spelled out verbatim
loses the `text.frontmatter.description` scope entirely. The wrapper only
flattened `>` folded scalars, so plain, double-quoted and single-quoted
multi-line descriptions silently reported zero alerts and exit 0 — a clean pass
indistinguishable from a real one, in a prefilter whose callers are instructed
not to re-derive its verdict by judgment.
Implementation notes:
- Classify the scalar kind after `^description:[ \t]*` and reuse one shared
continuation-line generator for every form; `|` literal blocks keep their
line breaks, stay verbatim-matchable, and are still left untouched.
- Emit the flattened value in whichever scalar form needs no escape at all
(plain, then single-quoted, then double-quoted), because any escape breaks
the verbatim match. The old blanket `'` -> U+2019 substitution silently made
apostrophe-bearing rule tokens unmatchable across 63% of the corpus; it now
survives only for the one combination no YAML scalar can carry verbatim.
- Terminate continuations at a line flush with the key, not only on a shallower
indent — a `description:` followed by a flush-left line previously swallowed
the rest of the frontmatter.
- Route vale's value-taking flags explicitly instead of inferring targets by
file existence, and absolutize relative `--output`/`--path` values the way
`--config` already was, since the run `cd`s into the scratch mirror.
- Fail loudly on a nonexistent path instead of inheriting bare vale's fallback
to stdin, which rendered a typo'd path as `0 errors ... in stdin`, exit 0 —
a form the callers' `0 files` NOT-RUN guard cannot match.
- Follow symlinks when walking a directory argument, matching bare vale.
Refs: #85
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