[codex] add agent response views

[HappySean2845]

Summary

Adds opt-in agent-friendly response views to surf-cli so instant-mode prompts can avoid brittle jq projections over raw API envelopes.

What changed

• Adds hidden global flags:
  • --agent-view <view> for stable compact command-specific JSON views.
  • --shape for a JSON response shape summary with sample data and suggested views.
• Adds a CLI-side response transform registry for:
  • search-web --agent-view results
  • project-detail --agent-view contracts
  • market-tge --agent-view summary
• Keeps default output unchanged unless one of the new opt-in flags is passed.
• Preserves existing onchain-tx hex quantity decimal enrichment.

Why

Recent instant eval batches showed jq failures mostly came from variable raw response shapes, not from missing prompt instructions. These views move common envelope parsing into deterministic CLI code while leaving API contracts and default CLI behavior untouched.

Impact

This is client-side and opt-in. Existing surf ... --json behavior is unchanged, so downstream Surf services, NER, spotlight, and existing scripts are unaffected unless they explicitly start using --agent-view or --shape.

Validation

• go test ./cli -run 'TestTransformResponseForCommand|TestMakeRequestAndFormatTransformsOnchainTxResponse'
• go test ./cli -skip '^TestRequestRetryAfter$'
• go test ./cmd/surf -run '^$'

Note: full go test ./cli still hangs on existing TestRequestRetryAfter, which sleeps until the package timeout. I skipped only that existing slow test for broader CLI validation.