Fix code-memory packaging audit findings

[mstuart]

Summary

• align Cargo, CLI, MCP server, tests, and npm wrapper naming/versioning for code-memory
• add recognized MIT LICENSE files and npm lock/package contents, and remove tracked backup files
• add CI npm package smoke test and preserve legacy .claude-context reads for migration compatibility
• make Postgres integration tests skip unless TEST_DATABASE_URL is provided, while CI provisions Postgres

Validation

• cargo fmt --package code-memory -- --check
• cargo clippy -- -D warnings
• cargo test
• npm install --ignore-scripts
• npm run check
• cargo build --release
• npm pack --dry-run
• node npm/bin/code-memory --version
• npm pack --ignore-scripts

Notes

• Existing dirty files in /Users/mark/git/claude-context were preserved by working in an isolated worktree.