docs: clarify ingestion docstrings

[Tethys0]

Why

The generated prose in the ingest_url and write_research_file docstrings does not describe the existing API, including a return description that suggests a payload pipeline rather than a file path. This resolves #130.

What changed

Replaced only the five requested url, name, content, source_url, and return descriptions with plain descriptions derived from the current function bodies. No runtime behavior changed.

Verification

• python -m pytest tests/test_timestamp_consistency.py -q - 6 passed
• ruff check palinode/ tests/ scripts/
• bandit -r palinode/ -ll - no medium/high findings
• git diff --check
• independent spec and quality/security review - approved

I also ran the full suite. It is blocked in this local environment by the absent system jq binary: hook tests explicitly execute with PATH limited to /usr/bin:/bin; a baseline run of test_hook_script_counts_user_messages_correctly fails unchanged for that reason. The scoped ingestion test and all requested static checks pass.

[Paul-Kyle]

Merging — clean, accurate, and exactly the scope. "Optional URL from which the research content was
fetched" is what that parameter always was; the text it replaces claimed a payload pipeline.

GitHub didn't record you as assignee, so the field shows me as tracker proxy — a platform limitation,
not a comment on whose work this is. It's yours and the merged commit carries your authorship. Thanks
for the quick turn, and for the second contribution.