Extract three internal helpers to reduce the main function from ~330
lines to ~80 lines:
- _process_item(): handles per-item extract/summarize/filter/build
- _build_and_persist_delivery(): builds payload and persists keyword index
- _build_run_report(): assembles status counts and run report dict
No behavior changes. External signature and return shape unchanged.
Eliminate the NamedTemporaryFile workaround in server.py by adding a
`context` dict parameter to run_freshrss_pipeline. The pipeline resolves
filter context from the dict first, falling back to context_path, then
defaulting to an empty FilterContext. Remove unused json/tempfile imports.
Added explanatory comments to server.py, freshrss_pipeline.py, pipeline.py,
freshrss.py, keyword_index.py, summary_loop.py, and filters/engine.py.
Also added CODE_REVIEW.md with prioritized improvement suggestions.
wdm