fix(scripts): loadMintIgnore mis-parses dir patterns without leading …

[forumevi]

What's broken

loadMintIgnore in scripts/lib/docs-utils.js mis-parses .mintignore
directory patterns (lines ending in /*) that don't start with a leading
slash.

if (trimmed.endsWith('/*')) {
  ignored.dirs.add(trimmed.slice(1, -2));
}

slice(1, -2) unconditionally drops the first character, assuming it's
always the leading /. For a pattern without one, it instead drops the
first character of the real directory name:

"/docs/*".slice(1, -2)  -> "docs"   (correct)
"docs/*".slice(1, -2)   -> "ocs"    (wrong — should be "docs")

Any .mintignore directory entry written without a leading slash (e.g.
docs/* instead of /docs/*) silently ends up ignoring the wrong directory
name, so the intended directory is never actually skipped by the docs-tree
generators that consume this list.

Fix

Strip the trailing /* first, then only strip a leading / if one is
actually present:

if (trimmed.endsWith('/*')) {
  const dirPattern = trimmed.slice(0, -2);
  ignored.dirs.add(dirPattern.startsWith('/') ? dirPattern.slice(1) : dirPattern);
}

This keeps existing anchored patterns (/docs/*) working exactly as before,
and fixes unanchored ones (docs/*, nested/dir/*) to resolve to the
correct directory name instead of a truncated one.

Fixes #

[cb-heimdall]

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