fix(ci): pin v6.11 iOS formatter

[RomneyDa]

What Problem This Solves

Canonical Full Release Validation run 29619930698 failed in CI child 29619948239, iOS job 88012875723. The candidate-owned workflow installed moving Homebrew SwiftFormat 0.62.1, and the generated Xcode lint phase rejected 54 unchanged v6.11 Swift files under newer formatting rules.

Why This Change Was Made

This is the bounded iOS adaptation of upstream #105242 / 265ca345a1ea60a782e3e30e4b0436fda7a9a679.

• install checksum-verified SwiftFormat 0.61.1, the v6.11 source contract;
• keep bounded download/retry behavior;
• point the generated Xcode phase's Homebrew-first lookup at the verified binary;
• extend the existing workflow guard to cover both macOS and iOS jobs.

Native sources are intentionally unchanged. Main already contains the generic upstream fix.

User Impact

None at runtime. This changes only frozen release validation tooling. It does not alter product code, native artifacts, package versions, npm inventory, publication permissions, or release scope. The 2026.6.33 release remains npm-only.

Evidence

• actionlint .github/workflows/ci.yml
• node scripts/run-vitest.mjs test/scripts/ci-workflow-guards.test.ts — 32/32 passed
• node_modules/.bin/oxfmt --check test/scripts/ci-workflow-guards.test.ts
• git diff --check
• Failure: https://github.com/openclaw/openclaw/actions/runs/29619948239/job/88012875723
• Upstream owner fix: ci: pin frozen iOS formatter #105242

After merge, npm preflight and all-groups Full Release Validation will be rerun from the new exact extended-stable/2026.6.33 head. No tag or publication has occurred.