Remove leftover empty examples/__init__.py

[dgenio]

Context

examples/__init__.py is an empty file added in the initial v0.1.0 commit (da2b3d7), likely by reflex. It serves no purpose:

• The file is empty — no package-level imports or configuration.
• CI only runs ruff check / ruff format against the examples/ directory path, which doesn't require it to be a package.
• examples/simple_linear_flow.py imports from chainweaver, not from sibling modules.
• No tests import from examples/.

Proposed change

Remove examples/__init__.py from the repository.

Origin

Raised during review of #94 (docs rewrite PR) — the repo map in AGENTS.md omits this file, and adding it to the map would imply a purpose it doesn't have.