Add useful attributes to the JSON and Regex nodes

[Keavon]

This also fixes the broken 'Regex Find' document node which was inadvertently returning a table instead of a string after the traits changed to make that happen.

Partly closes #3779.

[gemini-code-assist]

Code Review

This pull request introduces a new extract_element node for retrieving bare values from tables and enhances the JSON and Regex nodes to include metadata attributes such as type, start, end, and name in their output table rows. A review comment points out a potential overflow and truncation issue in the extract_element implementation when casting SignedInteger (i64) to i32, suggesting a safer indexing logic using unsigned_abs().

[cubic-dev-ai]

1 issue found across 4 files

Confidence score: 3/5

• There is a concrete regression risk in node-graph/nodes/graphic/src/graphic.rs: negating a signed index can overflow at i32::MIN, which can trigger a panic for extreme negative inputs.
• I’m scoring this as moderate merge risk because the issue is medium severity (6/10) with high confidence (9/10) and affects runtime behavior rather than just style/maintainability.
• Pay close attention to node-graph/nodes/graphic/src/graphic.rs - replace signed negation with a safe distance calculation (for example unsigned_abs()) to avoid overflow-driven panics.

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="node-graph/nodes/graphic/src/graphic.rs">

<violation number="1" location="node-graph/nodes/graphic/src/graphic.rs:103">
P2: Negating a signed index here can overflow (`i32::MIN`), causing a panic path for extreme negative inputs. Use `unsigned_abs()` to compute distance from the end safely.

(Based on your team's feedback about avoiding panics in application code.) [FEEDBACK_USED]</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}