[belfordzjeeves]

Fixes #198

Root cause

schemaPathToRegularPath in src/index.ts converted traverse paths to data
jsonpaths by splitting on . and only understanding bare properties/items
tokens. Since traverse >= 1.11, non-identifier property keys are emitted
bracket-quoted (e.g. $.properties["Some-Prop"]). That token matched neither
branch and was silently dropped, so the property subschema was validated
against the whole data object instead of data["Some-Prop"]: valid data
failed validation, and invalid data failed for the wrong reason.

Fix

Rewrote the path conversion to properly tokenize traverse paths:

• ["quoted"] segments are parsed as one token (never split on .); quoted
  names may contain dashes, spaces, dots, or escaped quotes (unescaped via
  JSON.parse).
• Property names are emitted in jsonpath bracket notation:
  $.properties["Some-Prop"].items[0] -> $["Some-Prop"][0],
  $.properties["a"]["b c"] -> $["a"]["b c"].
• Preserved behavior: bare properties ($.properties.foo -> $["foo"]),
  single-schema items ([*]), tuple items[n] ([n]), and non-properties
  keywords (allOf[n], patternProperties, ...) still map to the enclosing
  data as before.
• The segment after properties is always treated as a property name, even
  when the name itself is properties or items.
• Names containing a double quote are emitted single-quoted ($['a"b'])
  because the jsonpath lib does not process escapes inside "...".

Verification

• Repro from Doesn't support schemas with dashes/spaces in property names #198 before: validator(schema, { "Some-Prop": "ok" }) returned
  ValidationErrors; after: returns true. Wrong-type data still returns
  ValidationErrors with exactly one StringValidationError for the property
  itself.
• Full suite: 48/48 tests pass (38 existing + 10 new regression tests: dashed,
  spaced, dotted, and double-quoted property names; nested dashed properties;
  dashed property in array items and tuple items; dashed property in allOf;
  property literally named items).
• Coverage thresholds met: statements 97.14% (>= 94.28), branches 93.25%
  (>= 87.77), functions 100%, lines 96.98% (>= 93.99). New code is fully
  covered; the only uncovered lines in src/index.ts are pre-existing
  validateItem branches.
• npx tsc --noEmit passes.