#87: Presentation Settings must not trigger Local rebuilds

[Unthred]

Summary

• Root cause: Settings Save always reused launch (StopAll → StartActive → BuildAsync).
• SettingsApplyImpactClassifier + exhaustive SettingsApplyImpactCatalog (75 persisted leaf paths).
• HardRestart only for Local process/watcher identity: Id, Local active, RootFolder/ProjectFile/LaunchProfile/ExtraDotNetArgs, RunMode, WatchExcludeSegments.
• SoftRuntime for Azure/monitor/display names and Local policy knobs read live via UpdateDefinition (RunTests, TestProjectFile, restart flags, BuildControlMode, FileChanges, lock/repair, StartOnLaunch, UI prefs).
• Reflection coverage + per-path mutation tests fail if a new persisted property is unclassified.
• Known limitation (follow-up): no remount-without-rebuild path yet — HardRestart may still build when StartOnLaunch is on.

Classification corrections (audit)

Property family	Was	Now
RunTests / TestProjectFile	Hard	Soft
RestartOnCrash / MaxRetries / AutoRestart* / RestartAppAfterRebuild	Hard	Soft
BuildControlMode / FileChanges / StartOnLaunch	Hard	Soft
ReleaseOutputLocks / AutoRepairCorruptedOutput	Hard	Soft
Azure-only add/active (prior commit)	Hard	Soft
Local UI prefs (prior commit)	Hard	Soft

Manual (accepted)

• ByProject ↔ ByOperation + no-op save — no Local rebuild

Test plan

• Focused SettingsApplyImpactClassifierTests 95 passed
• Full ship-check 676 passed (Release)
• Catalog covers every discovered persisted leaf path

Closes #87