docs: correct proxy-routing.json schema description

[dean0x]

Summary

The CLAUDE.md documentation incorrectly described ~/.devflow/proxy-routing.json as a bare {port} object with all unrecognised keys rejected. In reality, subswitch 0.2.0's config schema accepts five keys: port, logLevel, anthropic, providers, limits.

What's Documented vs. What's True

Before (incorrect):

• "port only — bare {port} object"
• "the 0.2.0 routing runtime rejects unrecognised keys"

After (correct):

• Strict schema with five keys: port, logLevel, anthropic, providers, limits
• Devflow writes port plus anthropic.connectTimeoutMs: 120000 (the subswitch#27 TTFB workaround)
• Unrecognised keys — including legacy limits.connectTimeoutMs — are hard startup errors

Verification

This fix is based on a source audit of subswitch 0.2.0's config.ts schema validation and confirmation that the live relay successfully loads the exact configuration devflow generates. See dean0x/subswitch#42 for related upstream context.