inspect_element: smaller additions to consider

[HEnquist]

A grab-bag of smaller, lower-priority inspect_element enhancements, grouped so they don't each need their own issue. Each is independent; pick off whatever's worth it. (See also the larger ones: #5 overflow, #6 occlusion, #7 effective visibility, #8 accessibility.)

• Clipped-by-ancestor — distinct from inViewport: is the element cut off by an ancestor's overflow:hidden / scroll container, even though it's within the viewport? Report a flag (and optionally the clipping ancestor).
• Pseudo-element content — getComputedStyle(el, '::before' / '::after').content when set. Icons and generated text often live here and are otherwise invisible to the agent.
• Short ancestor chain — a compact path like body > main > div#app > button.cta so the agent gets structural context without a full get_html.
• Framework component name (experimental) — best-effort React component name via the fiber (and/or other frameworks). Leans into the "sees framework internals" angle, but it's fragile across versions, so treat as experimental/opt-in.

Implementation note

All of these live in inspectEl() in packages/core/src/commands.ts. Keep them curated/low-token and consistent with the existing payload. Update the doc-sync map in CLAUDE.md if the output shape changes.

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Update (release/0.3, #10): the first three are implemented as clipped, pseudo, and path on the inspect_element payload. The framework component name is left for a separate experimental pass (fragile across versions, dev-mode/React-only).

[HEnquist]

Status: the first three (clipped-by-ancestor, pseudo-element content, short ancestor chain) shipped in #10 as clipped, pseudo, and path. Leaving this open for the last item, the experimental framework component name via the React fiber, which is deferred since it's fragile across versions and React/dev-mode only.