fix(domains): report a page-side throw instead of blaming the ref

runOnElement checked only whether Runtime.callFunctionOn reached Chrome, not
whether the function it ran threw. A page-side exception left result.value
undefined, the result guard rejected it, and browser_fill, browser_focus and
browser_select_option all reported "No element matched: <ref>" for an element
that was there — sending the agent to re-snapshot a ref that was fine and
discarding the real error. The throw is now surfaced as cdp_error carrying the
exception text, which is distinguishable from both the no-match and stale-ref
paths; those still fire for a genuinely missing or stale element. The selector
path already reported throws correctly via evaluateJs.

Report: docs/superpowers/reports/2026-07-26-bug-audit.md#f2

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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