Release SDK updates

[llama-org-ci-bot]

Promotes stainless/release onto main — 3 commits. Merging this lets release-please cut the next release and write CHANGELOG.md.

Bug Fixes

• fix(parse): restore inline_images on cost_effective (new version 2026-08-11) (#23804) (d708ab4)

⚠️ Not conventional-commit — release-please will DROP these from CHANGELOG.md

• Ship agentic-plus 2026-08-19: promote planner-sebas to the latest Agentic Plus version (#24725) (5eb4731)

Codegen & merge commits (1)

• Build SDK (1c5ab68)

_{Regenerated by stlc-promote.yml on every promote, from main...stainless/release.}