chore(main): release 0.6.0

[smekcio]

🤖 I have created a release beep boop

0.6.0 (2026-02-22)

Features

• cli: add token-store policy visibility and plaintext warnings (fc8e779)
• cli: harden auth secret input handling (d7b7336)
• cli: implement DX-first KSeF CLI with docs and tests (295fb6e)
• cli: KSeF CLI with docs and tests (#15) (797adfd)
• security: enforce export part hash verification (966c895)
• security: validate presigned URLs for skip-auth transport (81bc405)

Bug Fixes

• ci: cover auth secret-source guard paths (ba4400a)
• ci: cover health token-store check normalization (439d2ce)
• ci: satisfy lint and 100% coverage for presigned URL hardening (15144c7)
• ci: satisfy ruff checks for export hash workflow tests (ce38add)
• ci: stabilize CLI tests and restore 100% coverage (e2ff607)

Documentation

• readme: refresh README copy and table of contents (4743f5c)
• remove DX-first wording from documentation (15140ab)

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