fix(scaffold): ship web projects test-ready (bun test + @types/bun)

[agjs]

Problem

Generated web apps shipped with no test runner and no bun:test types. So when TDD enforcement (default-on since 0.14.0) required a test for .ts logic, the model had to:

• hand-roll a ~50-line src/bun-test.d.ts to get bun:test to type-check (TS2664/TS2307 under moduleResolution: bundler), and
• improvise a test runner.

This wasted real turns on a freshly generated project — exactly the headline use case.

Fix

packages/core/src/web-templates.ts:

• Both package.json templates (react + vanilla) now ship "test": "bun test" and @types/bun in devDependencies. installWebDeps runs bun install, so they're present at scaffold time. @types/bun is auto-included from node_modules/@types (no types array needed), so import { test, expect } from "bun:test" resolves with zero hand-rolled .d.ts.
• Reconciled the build guidance, which previously told the model not to write tests (contradicting TDD-by-default). It now says the runner is already wired (don't set one up) and that .ts logic needs a co-located bun:test *.test.ts, while presentational .tsx components stay test-free.

discoverTestCommand already prefers a real test script, so the gate also recognizes/runs these tests. buildWebGate does not run bun test, so a freshly scaffolded app (test script present, no test files yet) won't fail the gate on zero tests — enforcement stays with the test-sibling-required meta-rule.

Verification

• In a fresh dir with the scaffold's exact tsconfig (moduleResolution: bundler, no types array) and only @types/bun added — no hand-rolled .d.ts — tsc --noEmit is green (bun:test resolves) and bun test passes (1 pass).
• detect-gate.test.ts (scaffold tests): 18 pass, 0 fail.
• typecheck + lint + format: green.

[gemini-code-assist]

Code Review

This pull request adds a test script and Bun types to the React and Vanilla web templates, while updating the developer guidance to emphasize logic-based TDD using bun:test. However, the package @types/bun does not exist on npm and will cause installation failures. The feedback recommends replacing it with the official bun-types package, updating the TypeScript configurations accordingly, and adjusting the guidance text to avoid split import statements.

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