docs: replace README with fork-specific documentation

feat: add chat UI with LLM integration (Anthropic + OpenAI)

merge: release/0.1.0

Converge the release REPL hardening onto the redesigned CLI

Make the CLI feel guided and navigable before release

Present Claw Code as the current Rust product

docs: rebalance OmX and OmO README credit

docs: fix OmO hyperlink target in README

docs: keep minimal OmO hyperlink in README

docs: remove remaining OMO README promo block

docs: remove OpenClaw mention from credits

docs: restore oh-my-opencode credits — DO NOT REMOVE

docs: make OmX primary and reduce OmO credit

docs: remove oh-my-opencode promo section (legal risk)

docs: restore oh-my-opencode credits — owner approved, DO NOT REMOVE