Delete TODO.md (satellite dispatch queue — all tasks complete) and
FINDINGS.md (go-i18n research — absorbed into go-i18n docs).
Add docs/ecosystem.md mapping all 19 satellite Go packages with
dependency graph and Forge SSH URLs. Rewrite docs/index.md as a
proper documentation hub with section organisation.
Co-Authored-By: Virgil <virgil@lethean.io>
