docs: clarify web request redirect origin

[MuncleUscles]

Summary

• Clarify that gl.nondet.web.request() returns status, headers, and body.
• Add a Web Access note about redirects and evidence-origin assumptions.
• Recommend safer patterns when contracts rely on the source of external evidence.

Sanitized evidence basis

A recent builder report described testing a cross-host redirect with gl.nondet.web.request() and not finding docs that explained whether the API can disable redirects or expose the final/effective URL. Current docs covered web requests and stable fields, but did not call out redirect/evidence-origin behavior.

Test plan

• pnpm build

Note: Created by weekly docs-and-skills gap loop; draft for human review.

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