feat(app-builder): add typed generator catalog

[kattsushi]

Closes #134

Part of #131. Depends on #133.

Summary

• add schema-validated RenderContext and finite typed generator contracts
• compose closed catalogs in deterministic dependency order
• reject invalid contexts, dependency failures, duplicate identities, and post-construction graph mutation

Changes

File	Change
packages/app-builder/generation/src/kernel.ts	Define validated context, capability, generator, catalog, and typed failure contracts.
packages/app-builder/generation/src/catalog.ts	Decode context and compose finite catalogs deterministically with fail-closed conflict checks.
packages/app-builder/generation/src/index.ts	Export the public typed kernel surface.
packages/app-builder/generation/tests/kernel.test.ts	Cover hostile contexts, graph ordering, catalog failures, immutability, and unsafe roots.

Test plan

• pnpm nx run @effectify/app-builder-generation:test --skip-nx-cache — 23/23 passed
• pnpm nx run @effectify/app-builder-contracts:test --skip-nx-cache — 67/67 passed
• pnpm nx run @effectify/app-builder-generation:typecheck --skip-nx-cache
• pnpm nx run @effectify/repo:format:check --skip-nx-cache
• git diff --check
• Scoped remediation validator passed

Contributor checklist

• Linked an approved issue
• Added exactly one type:* label
• Tests included with the behavior
• Conventional commit format
• No Co-Authored-By trailers

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