github: a code of conduct written for this project

.github/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## The short version
+
+This project is about measuring things honestly. The same standard applies to
+how people are treated here: be accurate, be direct, assume the other person is
+trying to make the tool better.
+
+## Expected behaviour
+
+- Criticise the claim, the code or the measurement — not the person.
+- Say what you actually measured, and what you did not.
+- Accept a reverted patch without taking it personally. A mixed benchmark
+  result gets reverted here even when the idea was good; it is the rule, not a
+  verdict on the contributor.
+- English or Persian are both fine in issues and discussions.
+
+## Unacceptable behaviour
+
+- Personal attacks, harassment, or discriminatory language of any kind —
+  including about nationality, religion, gender, sexuality, disability or age.
+- Publishing someone's private information without permission.
+- Sustained disruption: reopening settled decisions without new evidence,
+  demanding unpaid work, or spamming issues.
+- Presenting numbers you did not measure, or numbers from a tuned set, as the
+  project's results. In a project whose whole point is honest measurement, this
+  is a conduct problem and not only a technical one.
+
+## Scope
+
+Issues, pull requests, discussions, commit messages, and any space where
+someone is representing the project.
+
+## Reporting
+
+Report to **1.parsa.karkooti@gmail.com**. Reports are read by the maintainer
+only. Include links and enough context to act; you will get a reply within a
+week. Security issues go through a
+[private advisory](https://github.com/ParsaVictor/code-context-engine/security/advisories/new)
+instead — see [SECURITY.md](SECURITY.md).
+
+## Enforcement
+
+The maintainer may edit or delete comments, close issues, or block accounts.
+The usual sequence is a private note first, then a temporary block, then a
+permanent one; serious cases skip straight to the end.
+
+Adapted in spirit from the [Contributor Covenant](https://www.contributor-covenant.org),
+rewritten for this project rather than copied.