Fix INTERNAL iOS Ghostty startup crash

[azooz2003-bit]

Fixes the cmux INTERNAL TestFlight crash from August 2, 2026, where build 20260801151612 crashed in ghostty_init + 1388 while the main thread was in setlocale from GhosttyRuntime.init.

Bumps the ghostty submodule to f0f8273b7 (manaflow-ai/ghostty@f0f8273, already on fork main), which moves ensureLocale() and syncEnviron() in src/global.zig before crash-reporting init. Darwin's setlocale mutates global libc state; Sentry's crash-reporting init starts a background thread, and during embedded (iOS) startup that thread raced the process-wide locale mutation. Ordering locale setup before any Ghostty-owned background thread starts removes the race.

This is a principled fix (initialization ordering, not a workaround). docs/ghostty-fork.md is updated with the fork-change entry and a conflict note to preserve the ordering in future global.init merges.

🤖 Generated with Claude Code

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• docs/ghostty-fork.md
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✨ Finishing Touches 💡 1

⚔️ Resolve merge conflicts 💡

• Resolve merge conflict in branch fix-internal-crash-2026-08-02-claude

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-internal-crash-2026-08-02-claude

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