feat: gpt-5.6-sol bounded-scope overlay + scope-aware resolvers

The Sol profile pins the explicit task as the lake: adjacent work is
report-only, investigation is bounded, runs terminate on one clean
verification pass, and the AskUserQuestion decision-brief format is never
trimmed. The overlay wrapper grants scope-interpretation precedence while
concrete workflow steps, gates, and skill-mandated re-verification loops
still win. Sol-specific Completeness Principle and first-run intro copy.
New SETUP_COMMAND resolver renders './setup --host <host>' for every
non-claude host so generated upgrade skills reinstall their own host.

scripts/resolvers/preamble.ts

@@ -97,7 +97,7 @@ export function generatePreamble(ctx: TemplateContext): string {
     generatePlanModeInfo(ctx),
     generateUpgradeCheck(ctx),
     generateWritingStyleMigration(ctx),
-    generateLakeIntro(),
+    generateLakeIntro(ctx),
     generateTelemetryPrompt(ctx),
     generateProactivePrompt(ctx),
     generateFirstRunGuidance(ctx),