CI-verify first-agent scaffold in 0-to-hero harness

[asim]

Summary:

• Add the maintained micro new 0→1 scaffold contract to the zero-to-hero CI script so scaffold → run/chat → inspect → deploy dry-run is verified from one provider-free entry point.
• Add a docs guard that fails if the zero-to-hero script drops scaffold, CLI, deploy, first-agent, or support-example checks.
• Update the harness README to describe the full first-agent 0→hero contract.

Testing:

• go test ./internal/harness/zero-to-hero-ci -run TestZeroToHeroReferenceDocs -count=1
• ./internal/harness/zero-to-hero-ci/run.sh
• go build ./...
• go test ./... (fails in this environment: atlascloud live stream endpoint returned 400, and loopback gRPC tests were blocked by Envoy)
• golangci-lint run ./...

Closes #4272
Closes #4278

[Copilot]

Pull request overview

This PR strengthens the no-secret “0→hero” CI harness contract by ensuring the maintained micro new 0→1 scaffold path is exercised alongside the existing first-agent/run/chat/inspect/deploy dry-run boundaries, and by adding a docs test guard to prevent the CI script from drifting away from the documented lifecycle.

Changes:

• Extend the zero-to-hero-ci run script to include the micro new 0→1 scaffold contract test.
• Add a docs guard test that asserts the CI run script continues to include the required lifecycle commands.
• Update the harness README to describe the full first-agent 0→hero contract, including scaffold.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
internal/harness/zero-to-hero-ci/run.sh	Adds the 0→1 scaffold (micro new) contract test to the CI entrypoint before the existing boundary checks.
internal/harness/zero-to-hero-ci/README.md	Updates documentation to reflect the full scaffold → first-agent → deploy dry-run contract verified by the harness.
internal/harness/zero-to-hero-ci/docs_test.go	Adds a test guard to ensure run.sh continues to include the key lifecycle verification commands.

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