initial rta docs

README.md

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+# Mock RTA Knowledge Base
+
+This hosted Git repo is intentionally plain Markdown. It has no RTA sidecars.
+Collaborators clone, edit, commit, and push it as the canonical documentation source.
+The projection operator reads a projector checkout and mirrors it into AFFiNE.

rta/concept.md

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+# RTA Conceptual Overview
+
+RTA is an app-authoring vocabulary and runtime discipline.
+Apps are described through primitives, patterns, archetypes, ports, policies, and adapters.
+The goal is to help agents build systems with observable boundaries instead of loose vibes.

rta/status.md

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+# RTA Status
+
+This is a demo status, not an exhaustive status report.
+The current mock says RTA has a working Markdown projection slice with hosted Git as the source authority.
+Live AFFiNE writing remains the next adapter step.