v1.5.1

What's Changed

• chore: bump package versions to 1.5.1 (931fd85)
• docs: remove stale content and improve onboarding clarity (4bfd2c6)
• docs(standards): clarify L2 scope in skill and agent spec headers (d9cd426)
• docs: fix quickstart commands and collapse maintenance sections (3b09503)
• docs(init): add L0+ definition and unify heading language (55d181d)

Full Changelog: v1.5.0...v1.5.1