docs: finish stripping session residue from comments

[gabrielspadon]

Completes the pass started in #30. Prose only, no behaviour change.

Two dead string literals

test_workflow_contracts.py carried two orphaned string expressions sitting as no-op statements below the real docstrings — left behind when a docstring was replaced rather than edited:

def test_one_generation_segment_per_run(self) -> None:
    """Asserted against the SHADOW workflow, ..."""
    """The retired workflow swept the whole corpus in a loop until a digest
    stopped moving, ..."""          # <- dead statement, never read

Their live content is merged into the docstring above; the archaeology is dropped.

The rest

Narration that dated on arrival: a workflow comment reciting the August call-count chain (3121, 2686, 2447, 2233) and a cancelled runner, another naming the date publication last worked, and comments restating the line beneath them (# Remove phantom CSV entries above reconcile_summary_csv(...)).

Kept

# Parse failed - should be rare since we generated the BibTeX was proposed for deletion and I kept it: it explains why a branch is nearly unreachable, which is not restating the code.

Note on method

Automated application broke indentation in article.py (a deleted comment sat at a different indent from the line below). Caught by ruff, repaired, and the resulting diff for that file is exactly the two intended deletions and nothing else.

Verification

ruff clean, mypy clean (55 files), pyrefly 0 errors, pytest 2017 passed, 2 skipped.

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