feat: add arrayBuilder static arg support

[andreiancuta-uipath]

Summary

Adds support for the arrayBuilder static-argument variant. ArrayBuilder declares an array-typed parameter whose elements are addressed by indexed sibling entries ($['items'][0], $['items'][1], ...). At resolution time those indexed children are collected and assembled into a list in index order; gaps and out-of-scope nested paths become None. Child variants supported: static, argument (from agent input), and textBuilder.

Example

Input properties:

"$['items']":    arrayBuilder
"$['items'][0]": static("alpha")
"$['items'][1]": argument(userId)        # agent_input = {"userId": "u-42"}
"$['items'][2]": textBuilder("Hi, {name}")  # agent_input = {"name": "world"}

Resolved value:

$['items'] -> ["alpha", "u-42", "Hi, world"]

display_value

ToolStaticArgument now carries a separate display_value alongside value. The runtime call still receives the real value, but the schema modification step uses display_value, so sensitive arrayBuilder items render as "<hidden>" in the schema enum (e.g. ["<hidden>", "public"]) while the tool itself is invoked with the real secret.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[andreiancuta-uipath]

@claude review