Connor JohnstoneandClaude Opus 5 185b45dbfc Add the prune rule, its tests, and a corpus validator ...

The rule PLAN.md describes and the rationale it gives for that rule
disagree on one shape that turns out to be common. 235 checkboxes in the
corpus sit under a plain bullet used as a group label, and by the letter
of the rule those have no checkbox ancestor, so a finished one would be
dropped on its own. But section 4 already argues the opposite case for
checkbox parents: a finished item under an unfinished group is context,
not cruft, and a label like `- Trellis "Ergonomics" Fixes` is a group in
every sense that matters.

Resolved in favour of the rationale, which collapses both cases into one
rule. A top-level bullet is any bullet with no bullet ancestor in its
section. It is dropped, with its subtree, exactly when that subtree holds
at least one checkbox and all of them are [x]. Prose bullets hold none and
so are never eligible, which is the property section 4 wanted.

Validated across all 228 notes with zero invariant failures: no heading,
no unfinished item and no checkbox-free subtree is ever removed, and no
group label is left with its children gone. 270 lines would be dropped
across 118 files.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PU5ZFfQFtDTFqqhvMTWdGH

2026-09-09 18:30:29 -04:00

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