clean: remove framework files, calvana project only

CLAUDE.md

@@ -1,20 +0,0 @@
-# Pi vs CC — Extension Playground
-
-Pi Coding Agent extension examples and experiments.
-
-## Tooling
-- **Package manager**: `bun` (not npm/yarn/pnpm)
-- **Task runner**: `just` (see justfile)
-- **Extensions run via**: `pi -e extensions/<name>.ts`
-
-## Project Structure
-- `extensions/` — Pi extension source files (.ts)
-- `specs/` — Feature specifications
-- `.pi/agents/` — Agent definitions for agent-team extension
-- `.pi/agent-sessions/` — Ephemeral session files (gitignored)
-
-## Conventions
-- Extensions are standalone .ts files loaded by Pi's jiti runtime
-- Available imports: `@mariozechner/pi-coding-agent`, `@mariozechner/pi-tui`, `@mariozechner/pi-ai`, `@sinclair/typebox`, plus any deps in package.json
-- Register tools at the top level of the extension function (not inside event handlers)
-- Use `isToolCallEventType()` for type-safe tool_call event narrowing