docs: post-release documentation alignment (#154)

[rosspeili]

Description

Post-release documentation alignment so user-facing and contributor docs match the repo after the testing-architecture and CLI work landed.

Doc Fix — syncs category tables, dev install guidance, Python version messaging, env var onboarding, and Black CI wording. No code or skill bundle changes.

Changes

• Categories — CONTRIBUTING.md and ai_native_workflow.md match the live registry (dev_tools, defi, novelty_extractor, etc.); catalog descriptions cleaned of stale issue refs
• Install — [dev,all] for CI parity; [dev] called out for docs-only work (README, CONTRIBUTING, requirements.txt)
• Python — README badge and Quick Start updated to 3.10+ (matches pyproject.toml and CI)
• Configuration — README points to .env.example, api_keys.md, and per-skill catalog pages; DeFi wallet vars added to .env.example (commented, with security notes)
• Framework env vars — SKILLWARE_SKILL_PATH and SKILLWARE_NO_VERSION_CHECK documented in api_keys.md
• Testing docs — TESTING.md and CONTRIBUTING.md state Black is CI-gated

Checklist

• Doc Fix: Documentation update
• Agent Code of Conduct
• Docs-only — no pytest subset required for behavior changes
• CHANGELOG.md updated under [Unreleased]
• examples/README.md — N/A (unchanged)

Related Issues

Fixes #154