feat(agent): add static runtime preflight

[zpzjzj]

Summary

• run binary availability and static version checks before each case without probing authentication
• enforce exact configured CLI versions for supported isolated adapters while never modifying runtime: none hosts
• record requested, applied, and observed versions in JSON, Markdown, and HTML reports

Compatibility

• local login remains delegated to the CLI; preflight makes no authentication or model request
• QoderCLI versions are observed, while engine.version remains unsupported and is ignored
• historical YAML, CLI override, and GitHub Action behavior remains compatible

Validation

• make verify
• make test
• make test-action
• make build
• go test -tags e2e -v -parallel 1 ./e2e

Part of #196 (PR 5).

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T04:58:44.095762Z	e19c008	PR opened

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