ci: stop restoring an iOS GhosttyKit cache nothing saves

[teamleaderleo]

test-ios.yml restores an ios-ghosttykit-* cache on every run, and it has never hit. The only writer was a manual main dispatch with seed_cache=true, and none has been sent. Runs 35973431841, 35970618613, and 35967522480 all log "no entry". This PR removes the restore and the save instead of adding a writer, because a hit would save almost nothing.

On a miss, Provision GhosttyKit takes 3 to 4 s. ensure-ghosttykit.sh downloads the pinned 123 MB prebuilt at about 200 MB/s and verifies its checksum. The cache would hold the unpacked xcframework, and restoring that from R2 takes about as long. Adding a writer would mean a ci-cache-writer environment and R2 secrets on a dispatch-only workflow whose ref input can check out branch code, all to save a second or two. When there's no pinned prebuilt for a Ghostty SHA, the fallback is a source build keyed by that same SHA. The first run on a new SHA would miss either way.

Also removed: the Capture Ghostty revision step, which only these two steps used. seed_cache now describes what it still saves, the iOS SwiftPM cache. CMUX_GHOSTTYKIT_CACHE_DIR still points the provisioner at $RUNNER_TEMP, so reused self-hosted runners don't collect xcframeworks in $HOME. #14180 covers ios-spm-* from the TestFlight lanes and doesn't touch this file.

Validation. No test pins these steps (grep of tests/). test_ios_workflow_dispatch_ref.py, test_ios_video_recording.py, and test_ios_selected_test_execution.py pass locally. test_ios_simulator_build_once.py has 5 errors locally, and it has the same 5 on unmodified upstream/main. Fork CI: https://github.com/teamleaderleo/cmux/actions/runs/35976528789.

🤖 Generated with Claude Code

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Summary by cubic

Removes the ios-ghosttykit-* cache restore and save from test-ios.yml, along with the Capture Ghostty revision step that only they used, because the restore has never hit and a hit would save almost nothing.

• The only writer was a manual main dispatch with seed_cache=true, and none was sent; a miss costs 3–4 s, about what an R2 restore of the unpacked xcframework would take.
• seed_cache now covers only the iOS SwiftPM cache, and CMUX_GHOSTTYKIT_CACHE_DIR still points at $RUNNER_TEMP so reused self-hosted runners don't collect xcframeworks in $HOME.
• No test pins the removed steps; test_ios_simulator_build_once.py fails the same 5 ways on unmodified upstream/main.

^{Written for commit e3a5b9b. Summary will update on new commits.}

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• .github/workflows/test-ios.yml

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