chore(release): validate 1.9.0 rich text carrier [DO NOT MERGE]

[bytemain]

Purpose

Evidence-only PR for the Mobile 1.9.0 Kuikly carrier. Do not merge this PR into staging2. Mobile will pin the exact carrier commit after its own release PR gates pass.

Exact contract

• parent/original 1.9.0 pin: c7a021270847434a5f5b9aa3e94e44ce17726519
• carrier head: d1ae9e290a66fc93a7040e4c00d4bc59e513d623
• carrier tree: b09aeb59818b4907e3685dac863140539891ee7b
• strict one-path +3/-1 guard in KuiklyRenderLayerHandler.mm
• stable patch-id matches landed PR fix(ios): guard optional render view method dispatch #123: 2d0a7bbfd80f40f61a6d68c4cd0abe47b7b2f4ab
• handler postimage blob matches landed PR fix(ios): guard optional render view method dispatch #123: d4b7e59766fc5da3128407401071c75a45815696

Scope

This branch intentionally excludes all later staging2 changes, including viewport and gradient-wrapper work. It exists only so exact Hosted can validate the standalone carrier before the Mobile release-1.9.0 gitlink PR.

Signed-off-by: artin artin@cat.ms