docs: refresh bilingual README presentation

[yehyakin]

Summary

Describe the user-visible change.

Why

Explain the problem and why this is the smallest sufficient change.

Scope

• Changed:
• Intentionally unchanged:

Validation and evidence

List exact commands, exit codes, and relevant runtime evidence. Distinguish local verification, hosted CI, installed state, and model/runtime observations.

Checklist

• The change is focused and does not include unrelated refactors.
• Relevant contract or forward tests were added or updated.
• README.md and README.en.md remain aligned when shared facts changed.
• No credentials, private paths, or private repository data are included.
• Permission, write-ownership, exact-routing, and fail-closed boundaries are preserved.
• Claims are supported by fresh evidence and known limitations are explicit.
• Documentation and licensing attribution are complete.