fix: The Debug-switch warning says the setting goes back to the startup preference, not that it reverts

[hatayama]

Summary

• When enabling a pause point switches a Release Editor to Debug, the warning no longer says the setting "reverts on every Editor restart". It now says that on restart the setting goes back to Unity's 'Code Optimization On Startup' preference, which is Release unless it was changed.
• The pause-point troubleshooting reference, the soak-testing doc, and one code comment say the same.

Why

• Unity's reference source shows:
  • Setting CompilationPipeline.codeOptimization changes only the native value for the current session. It writes neither EditorPrefs nor the project.
  • The value at startup comes from the EditorPrefs key ScriptDebugInfoEnabled, shown in Preferences as 'Code Optimization On Startup'. It is a per-user setting, not a project setting, and it defaults to false (Release).
  • uloop set-code-optimization debug --startup writes that same key.
• So a restart does not go back to Release; it goes back to the startup preference. A trial user finished two sessions in Release and still found the Editor in Debug after uloop launch -r, which matches a startup preference of Debug. "Reverts" read as "goes back to Release".

Changes

• The automatic Debug-switch warning in the project runner: "This setting reverts on every Editor restart, ..." becomes "On every Editor restart the setting goes back to the 'Code Optimization On Startup' preference (Release unless that preference was changed), ...". The rest of the warning is unchanged.
• The pause-point troubleshooting reference: the switch changes this Editor session only, and a restart goes back to the per-user startup preference.
• docs/soak-testing.md: a restarted Editor comes back on the per-user startup preference, not "the project's own setting".
• A code comment beside the Editor-side recovery message, which already used the correct wording.

Verification

• Red first: with only the test's expected text changed, go -C cli/project-runner test ./internal/projectrunner -run 'TestPausePointAutoDebugSwitchWarningRecommendsApprovedStartupCommand' -count=1 failed on the mismatch. With the constant changed, it passed.
• gofmt -l cli/project-runner: no output. go -C cli/project-runner vet ./...: exit 0. golangci-lint run ./... in cli/project-runner: 0 issues.
• git grep -n "reverts on every Editor restart\|project's own setting\|lost on every Editor restart" -- cli Packages docs: no matches.

This pull request targets an integration branch, so the pull request CI does not run on it; the checks above were run locally.

Not changed

• Behavior: when and how the Debug switch happens.
• The Editor-side recovery message, which already says the setting reverts to the 'Code Optimization On Startup' preference.
• The set-code-optimization wording "for this Editor session" and its command description.

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⚙️ Run configuration

• Configuration used: Repository: hatayama/unity-cli-loop/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 66f810c2-710d-4d4d-9543-34eeb56ab4f5

📥 Commits

Reviewing files that changed from the base of the PR and between d872b6d and e3d83b3.

📒 Files selected for processing (5)

• Packages/src/Editor/CliOnlyTools~/PausePoint/Skill/references/troubleshooting.md
• Packages/src/Editor/FirstPartyTools/PausePoint/SourcePausePointConstants.cs
• cli/project-runner/internal/projectrunner/pause_point_release_recovery.go
• cli/project-runner/internal/projectrunner/pause_point_release_recovery_test.go
• docs/soak-testing.md

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