prompt: record latex-raw-string-docstrings as shipped (#491) - #256

Final lifecycle step: active/ → complete/2026/08/, active.md section removed, complete/index.md and the dashboard regenerated. lifecycle.py check and orphans both clean.

All six PRs merged — HowToFit#47, HowToGalaxy#70, HowToLens#73, autofit_workspace#145, autogalaxy_workspace#218, autolens_workspace#492. 41 files, 180 literals, 131 silent corruptions repaired.

The record leads with the findings worth carrying forward rather than the tally:

• The diff-empty gate cannot catch a wrong edit here. The generator reads source text, not runtime values, so a corrupted value regenerates byte-identically. The check that does catch it — comparing every changed literal's runtime value HEAD vs worktree, asserting the r prefix only ever removes corruption — caught two real errors mid-task: a print("\nInfo:") newline about to be destroyed, and 12 already-escaped $\\chi^2$ about to be doubled into LaTeX line breaks. Build that check first.
• \\ is always deliberate, whatever the surrounding context — a math-context rule alone lets these through, since they sit inside $…$.
• The warning sweep is interpreter-dependent — a SyntaxWarning-only sweep returns a vacuous zero on 3.11.
• Run the generator before editing and confirm a no-op, or pre-existing drift is indistinguishable from damage you caused.
• Preserve line endings — a write_text round-trip on a CRLF file turns a 1-character edit into a 549-line diff.

Also recorded: the one deliberate residue (autolens_workspace/scripts/group/likelihood_function.py, double-backslash convention, needs a convention decision), and the open question on HowToLens#73 — merged with smoke red, with a control experiment proving main is red too, and PyAutoArray#453 suspected but explicitly not proven.

Follow-up already shipped: PyAutoBrain#245 adds a hygiene escapes mode so this debt is caught continuously.

Note: the designated branch's previous PR (#255) was merged, so per the branch policy this restarts the branch from main and carries only the new commit.

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