Enhance support for Primary Keys and perf opt

[paco-valdez]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances primary key detection in cube_dbt by adding support for dbt 1.5+ constraints and test-based detection, while also introducing orjson as an optional performance optimization for JSON parsing.

Key Changes:

• Added primary key detection from dbt constraints (type: 'primary_key')
• Implemented fallback detection via unique + not_null test combinations
• Integrated orjson for faster manifest parsing with graceful fallback to standard json

Reviewed Changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/cube_dbt/model.py	Added constraint-based primary key detection with priority over test-based detection
src/cube_dbt/column.py	Enhanced primary_key property to detect keys from tests (unique + not_null)
src/cube_dbt/dbt.py	Added test index building and orjson integration for performance
pyproject.toml	Bumped version to 0.6.3 and added orjson dependency
tests/test_model.py	Added comprehensive unit tests for new primary key detection methods
tests/test_dbt.py	Added integration tests for primary key detection from tests and constraints
tests/manifest.json	Added test fixtures and constraint data to support new tests
QUICK_REFERENCE.md	New quick reference documentation
CLAUDE.md	New AI assistant guidance documentation

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