chore(release): 0.2.0

Bump @realflow/core, @realflow/react, @realflow/compat to 0.2.0 and cut the
0.2.0 changelog: compat layer, orthogonal routing, real-time collaboration,
off-thread + incremental layout, provider-agnostic AI agent, NodeResizer/
NodeToolbar/edge reconnect/clipboard, accessibility, benchmark + E2E tooling.

chore(release): rename npm scope @reflow -> @RealFlow

Publish under the @RealFlow org. Package names, internal dependencies, source
imports, workspace aliases, CI, docs and examples all move from @reflow/* to
@realflow/*; the library brand name (ReFlow) and the ReFlow component are
unchanged. Build, typecheck, lint and the 144 tests stay green.