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/__fixtures__/legacy-config/apophis.config.js

@@ -2,11 +2,9 @@
  * LEGACY APOPHIS configuration (old-style, for migration tests).
  * This uses deprecated field names that should be detected by `apophis migrate`.
  */
-
 export default {
   // Deprecated: 'mode' used to be 'testMode'
   testMode: "verify",
-
   // Deprecated: 'profiles' used to be 'testProfiles'
   testProfiles: {
     quick: {
@@ -17,7 +15,6 @@ export default {
       routeFilter: ["GET /legacy"],
     },
   },
-
   // Deprecated: 'presets' used to be 'testPresets'
   testPresets: {
     "safe-ci": {
@@ -28,7 +25,6 @@ export default {
       maxDuration: 5000,
     },
   },
-
   // Deprecated: 'environments' used to be 'envPolicies'
   envPolicies: {
     local: {