Merge branch 'codex'

feat: #AI commit# add Digital Humans toggle to Built-in MCP Extension…

…s settings. collaboration and commit by halo

docs: rewrite README with new positioning — Digital Human focus, Brow…

…ser Skill, all 7 languages

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

fix: strip reasoning_content from DeepSeek messages to prevent 400 er…

…rors

DeepSeek V4 rejects requests that include `reasoning_content` in assistant
messages when thinking mode is not active in the current request, returning
HTTP 400: "reasoning_content in the thinking mode must be passed back to the API".

Root cause: the router converter (converters/messages.ts) unconditionally adds
`reasoning_content` to all assistant messages when thinking blocks are present
(originally added for Moonshot compatibility).

Fix: extend DeepSeek adapter's `transformRequest` to strip `reasoning_content`
from all assistant messages before the request is sent to api.deepseek.com.
Third-party providers serving DeepSeek models can opt-in by setting
`adapterId: 'deepseek'` in their provider config.

Closes #88

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fix: #AI commit# restore dependencies regressed by bad merge from mai…

…n(v2.0.10) into skillhub branch. collaboration and commit by halo

Restores 6 fields lost when merging old main into feature/skillhub-adapter (commit e89a5d2):
- claude-agent-sdk: 0.1.76 → 0.2.89 (fixes CC SDK streaming)
- claude-code: latest → 2.1.89 (pin version to match production)
- postinstall: restore scripts/postinstall.mjs (restores cli.js dedup symlink)
- node-pty: ^1.1.0 (re-add dependency)
- asarUnpack: re-add node-pty/prebuilds/**
- nsis: re-add installer.nsh include for Windows installer

All values restored to match v2.1.1 production release.

#AI commit# fix: make @hello-halo/agent-sdk optional so users without…

… SDK can build

- Move to optionalDependencies: npm install won't fail if src/sdk is missing
- Add @vite-ignore: Vite skips resolution at build time
- Add try/catch: runtime falls back to Anthropic SDK if module unavailable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

#AI commit# fix: make @hello-halo/agent-sdk optional so users without…

… SDK can build

- Move to optionalDependencies: npm install won't fail if src/sdk is missing
- Add @vite-ignore: Vite skips resolution at build time
- Add try/catch: runtime falls back to Anthropic SDK if module unavailable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

chore: set version to 2.1.0-rc.1 for SkillHub pre-release

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

release: v2.0.9

#AI commit# feat: #AI commit# add browser policy enforcement and regi…

…stry overrides for enterprise builds. collaboration and commit by halo