Two changes:
1. structured-add-commands: The implicit note shorthand (kb "text") caused
accidental note creation from mistyped commands. Replaced with explicit
kb addnote <text> command. Root command reverts to standard Cobra
behaviour. Updated examples, tests, SKILL.md, and specs.
2. split-readme-developer-docs: Moved build-from-source instructions, release
process, API reference, and ROCm migration notes from README.md into a
new DEVELOPER.md. README now links to DEVELOPER.md for dev workflows.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
