fix(vercel-ai): refresh Anthropic IDs and strengthen integration DX

[saschabuehrle]

Summary\n- Update Anthropic Vercel AI adapter model presets to current IDs:\n - claude-haiku-4-5-20251001\n - claude-sonnet-4-6\n - claude-opus-4-6\n- Add Anthropic draft/verifier E2E coverage using:\n - drafter: Haiku 4.5\n - verifier: Opus 4.6\n- Improve vercel integration test DX by making tests runnable without prebuilding core/ml artifacts.\n\n## Validation\n-

@cascadeflow/vercel-ai@0.7.3 test /private/tmp/cascadeflow-vercel-dx-fix/packages/integrations/vercel-ai
vitest run

RUN v1.6.1 /private/tmp/cascadeflow-vercel-dx-fix/packages/integrations/vercel-ai

✓ tests/exports.test.ts (2 tests) 1ms

Test Files 1 passed (1)
Tests 2 passed (2)
Start at 19:28:19
Duration 163ms (transform 19ms, setup 1ms, collect 16ms, tests 1ms, environment 0ms, prepare 44ms) (passes without prebuilding core/ml)\n-
RUN v1.6.1 /private/tmp/cascadeflow-vercel-dx-fix/packages/core

Test Files 1 skipped (1)
Tests 1 skipped (1)
Start at 19:28:20
Duration 433ms (transform 159ms, setup 0ms, collect 300ms, tests 0ms, environment 0ms, prepare 33ms)\n-
RUN v1.6.1 /private/tmp/cascadeflow-vercel-dx-fix/packages/core

Test Files 1 skipped (1)
Tests 6 skipped (6)
Start at 19:28:21
Duration 279ms (transform 73ms, setup 0ms, collect 147ms, tests 0ms, environment 0ms, prepare 34ms)\n - Includes Anthropic Haiku 4.5 -> Opus 4.6 draft/verifier path\n-

@cascadeflow/core@0.7.1 build /private/tmp/cascadeflow-vercel-dx-fix/packages/core
tsup src/index.ts --format cjs,esm --dts --clean

CLI Building entry: src/index.ts
CLI Using tsconfig: tsconfig.json
CLI tsup v8.5.1
CLI Target: es2020
CLI Cleaning output folder
CJS Build start
ESM Build start
CJS dist/index.js 1.60 MB
CJS ⚡️ Build success in 96ms
ESM dist/chunk-XESOO5EG.mjs 6.52 KB
ESM dist/batch-E4EWL5CO.mjs 295.00 B
ESM dist/chunk-P4FCQ5D4.mjs 4.58 KB
ESM dist/chunk-XGB3TDIC.mjs 1.83 KB
ESM dist/quality-semantic-EBVNY2FX.mjs 133.00 B
ESM dist/index.mjs 518.01 KB
ESM dist/dist-K7RZMLIK.mjs 984.91 KB
ESM ⚡️ Build success in 97ms
DTS Build start
DTS ⚡️ Build success in 1042ms
DTS dist/index.d.ts 85.27 KB
DTS dist/index.d.mts 85.27 KB

@cascadeflow/vercel-ai@0.7.3 typecheck /private/tmp/cascadeflow-vercel-dx-fix/packages/integrations/vercel-ai
tsc --noEmit\n