refactor: remove depth/generationProfile tiering, use explicit runs

- Replace TestDepth ('quick'|'standard'|'thorough') with explicit runs:number
- Remove GenerationProfile type and all generationProfile parameters
- schema-to-arbitrary.ts now uses fixed defaults (string≤128, array≤10, props≤6)
- Delete src/cli/core/generation-profile.ts
- Remove --generation-profile CLI flag from verify and qualify
- Remove depth field from PresetDefinition and all preset scaffolds
- Remove generationProfiles from Config interface
- Update all test files: depth:'quick' → runs:10
- Remove depth from all fixture configs
- Update builders.ts, mutation.ts, outbound-mock-runtime.ts
- Build: clean | Tests: 849 pass, 0 fail

src/cli/core/context.ts

@@ -101,10 +101,6 @@ export function createContext(options: Record<string, unknown> = {}): CliContext
     ? options.color
     : 'auto';
 
-  const generationProfile = typeof options.generationProfile === 'string'
-    ? options.generationProfile
-    : undefined;
-
   return {
     cwd,
     env: {
@@ -119,7 +115,6 @@ export function createContext(options: Record<string, unknown> = {}): CliContext
     options: {
       config: typeof options.config === 'string' ? options.config : undefined,
       profile: typeof options.profile === 'string' ? options.profile : undefined,
-      generationProfile,
       format,
       color,
       quiet: options.quiet === true,