feat: finalize production cleanup with structured agent responses and project governance

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+We want ScreenJob to be an open, respectful, and harassment-free project for everyone.
+
+## Expected Behavior
+
+- Be respectful and constructive.
+- Assume good intent, ask clarifying questions, and focus on technical outcomes.
+- Accept feedback professionally.
+- Share credit and document decisions clearly.
+
+## Unacceptable Behavior
+
+- Harassment, threats, or intimidation.
+- Personal attacks, insults, or discriminatory language.
+- Publishing private information without permission.
+- Deliberate disruption of project collaboration.
+
+## Enforcement
+
+Project maintainers may remove or reject contributions and interactions that violate this Code of Conduct.
+
+## Reporting
+
+Report violations by opening a private maintainer contact issue or contacting the project maintainers directly.
+
+## Attribution
+
+This policy is adapted from the Contributor Covenant, version 2.1:  
+https://www.contributor-covenant.org/version/2/1/code_of_conduct.html