Add Cloudflare Workers + Hono + Angular SaaS conventions

[ProfessorManhattan]

Summary\n\nAdds conventions for building full-stack SaaS applications on Cloudflare Workers with Hono, Angular, and enterprise integrations.\n\n### Stack covered\n- CF Workers + Hono v4.12+ (typed RPC, middleware factory, method chaining)\n- Angular 21 (zoneless, signals, standalone, PrimeNG)\n- D1 + Drizzle v1 (batch API, type-safe schemas)\n- Inngest v4 (durable background jobs, step.ai.infer())\n- Clerk Core 3, Stripe, Resend, Bun 1.3\n- Testing: Playwright + Vitest (TDD, 6 breakpoints)\n\n### Includes\n- Hono Worker starter template\n- Security headers (OWASP Top 10:2025)\n- CSP template with Trusted Types\n- Quality thresholds (Lighthouse, WCAG 2.2 AA, perf budgets)\n- Common failure patterns and fixes\n- Deploy commands (wrangler + CDN purge)\n\n## Source\n\nExtracted from megabytespace/claude-skills — 14-category skill system, 94 reference docs."

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