v0.4.3

Hot-fix over v0.4.2. The 0.4.2 wheel boots and the pipeline runs end-to-end,
but the data_analyst specialist hits command not found: e2er-data and
no data is ever fetched — so papers reach paper_draft.tex without any
real data behind them. Trace from run 62526787-da0b-4ebd-8cf9-cf4f3e682a04
on the v0.4.2 PyPI wheel showed which e2er-data → not found inside the
claude_code subprocess, with PATH containing the venv's site-packages/scripts/
but not bin/. The skill files (data/yfinance.md, data/fred.md,
data/allium*.md) all instruct the model to invoke e2er-data ....

Lane C — Data

• Register e2er-data as an entry point in pyproject.toml [project.scripts]
  pointing at src.modules.data.cli:main. pip now installs a e2er-data shim
  next to e2er in the venv's bin/, so the bash wrapper from the dev
  checkout is no longer required on pip-installed systems.
• Prepend the venv bin/ to the subprocess PATH in claude_code.py
  (after the dev scripts/ dir, before the inherited PATH). Without this
  the entry-point shim is unreachable from the claude_code subprocess
  even after the shim is installed.