Use Tuist manifest environment

[Kyle-Ye]

Summary

This updates OpenSwiftUI to use Tuist's new manifestEnvironment support from tuist/tuist#10705 instead of mirroring OpenSwiftUI environment variables with a TUIST_ prefix.

Tuist previously filtered manifest evaluation environments down to TUIST_*, CI, and a small allowlist. That meant tuist generate could not see the same OPENSWIFTUI_* values that SwiftPM and tuist install could see, so the project carried a local workaround: duplicated TUIST_OPENSWIFTUI_* values in mise.toml plus a Tuist_OpenSwiftUI env lookup domain in Package.swift.

Changes

• Bump the pinned Tuist CLI from 4.192.0 to 4.193.0, the release that includes manifestEnvironment.
• Configure Tuist.swift to forward OPENSWIFTUI_* into manifest evaluation.
• Remove the duplicated TUIST_OPENSWIFTUI_* values from mise.toml.
• Remove the Tuist_OpenSwiftUI compatibility domain from Package.swift.

Verification

Verified locally in the prepared worktree with local dependencies present:

MISE_TRUSTED_CONFIG_PATHS="$PWD/mise.toml" mise x -- tuist version
MISE_TRUSTED_CONFIG_PATHS="$PWD/mise.toml" mise x -- tuist install
MISE_TRUSTED_CONFIG_PATHS="$PWD/mise.toml" mise x -- tuist generate --no-open
git diff --check

tuist version reported 4.193.0. tuist install and tuist generate --no-open both succeeded. Generation still emits the existing static product side-effect warnings, but the project is generated successfully and the package manifest logs show the unprefixed OPENSWIFTUI_* values are visible without the old TUIST_ mirrors.

[augmentcode]

🤖 Augment PR Summary

Summary: Updates OpenSwiftUI to rely on Tuist’s new manifestEnvironment so Tuist manifest evaluation can see the same OPENSWIFTUI_ variables as other build flows.
Changes: Bumps Tuist to 4.193.0, forwards OPENSWIFTUI_ in Tuist.swift, and removes the legacy TUIST_OPENSWIFTUI_* mirrors / Tuist_OpenSwiftUI domain.

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[augmentcode]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.19%. Comparing base (09a7f40) to head (d24690a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
- Coverage   27.21%   27.19%   -0.02%     
==========================================
  Files         673      673              
  Lines       44165    44165              
==========================================
- Hits        12018    12011       -7     
- Misses      32147    32154       +7     

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