test: add end-to-end tests for dispatcher message flow

Add multi-account WeChat bot support

Persist context tokens and redact sensitive logs

Fix README repository clone URLs

docs: clarify adminUsers is independent from allowedUsers

fix: prevent adminUsers from defaulting to allowedUsers & improve type safety

Use Codex config.toml provider config

Default Codex to full access

Add admin logout command

Fix fallback for unavailable session agents

docs: add technical guide with usage and architecture details

docs: add demo screenshot

feat: unified WeChat bot supporting Claude Code + Codex agents