Merge pull request #8 from kouko/fix/portable-tmp-path

feat: portable tmp path, skill-local data dirs & caption cascading download

Merge pull request #7 from kouko/refactor/flat-structure

refactor: flatten structure for cross-platform compatibility

Merge pull request #6 from kouko/fix/gemini-extension-root-manifest

fix(gemini): add root-level manifest for direct repo install

Merge pull request #5 from kouko/feat/gemini-extension-support

feat: add multi-platform support (Gemini CLI, OpenCode)

Merge pull request #4 from kouko/feat/youtube-audio-transcribe

feat(youtube): add audio transcription and refactor plugin architecture