chore(workflow): report completed work locally

[Zoupers]

Summary

• change the default completion boundary from automatic push and pull-request creation to local completion and user reporting
• require explicit user authorization before pushing a feature branch, creating a pull request, or merging
• retain the documented optional push and pull-request workflow for explicitly requested remote delivery

Validation

• git diff --check
• reviewed the final AGENTS.md diff for conflicting automatic-delivery language

Risks and compatibility

• documentation and agent-workflow guidance only; no runtime behavior or compatibility impact
• future agent sessions will stop after a scoped local commit and completion report unless the user explicitly requests remote operations

Checks not run

• code tests were not run because this change only updates repository workflow instructions