docs: add CODE_OF_CONDUCT.md and package.json metadata

Add Contributor Covenant Code of Conduct. Add repository, homepage,
keywords, and license fields to package.json for npm discoverability.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: niconiconi

CODE_OF_CONDUCT.md

@@ -0,0 +1,41 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior:
+
+- The use of sexualized language or imagery, and sexual attention or advances of any kind
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the project team at **security@ocash.io**. All complaints will be reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.

package.json

@@ -2,6 +2,24 @@
   "name": "@ocash/sdk",
   "version": "0.1.0",
   "description": "OCash ZKP SDK for browser, hybrid and Node runtimes",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/PolyhedraZK/ocash-sdk.git"
+  },
+  "homepage": "https://docs.o.cash",
+  "keywords": [
+    "zk",
+    "snark",
+    "zkp",
+    "zero-knowledge",
+    "privacy",
+    "utxo",
+    "ethereum",
+    "groth16",
+    "poseidon",
+    "babyjubjub"
+  ],
   "type": "module",
   "main": "./dist/index.cjs",
   "module": "./dist/index.js",