Update README and SPEC

Read the documentation-site concepts, retained specifications, navigation and current maintained targets. Apply the task directly when it needs one session; use CAFleet for independent delegated review when the task calls for it. An assigned member performs its own scoped work within the existing team.

README structure

Retain the title/demo/pitch, Install, Documentation and License surfaces. Align the pitch with the site hero, installation with Quickstart and documentation links with navigation. Keep detailed CLI/architecture/development content in the documentation site.

SPEC maintenance

SPEC is the self-contained reimplementation contract. Preserve its numbered structure and required detail for current CLI options/defaults, environment, schema, native input, finite receiving, authored errors, JSON order and text layouts. Update the affected contracts together; remove obsolete concepts completely and keep the description affirmative.

Retain exact current argv, presets, SQL and error blocks. Verify links and embedded runtime mirrors. Report the focused validation performed and material limitations. Write all maintained artifacts in English.