Address review feedback: In full-path XPath generation, elements with
IDs were producing bare predicates like `[@id='x']` which creates
invalid XPath steps like `//body/[@id='main']`. Now emits `*[@id='x']`
for full-path mode (e.g. `//body/*[@id='main']/*[@id='target']`).
Short-path XPath mode unchanged — still uses `//*[@id='x']` prefix.
Also added XPath evaluation assertion to the regression test to verify
the generated selector actually selects the correct element.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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