[yeroo]

Closes #1728 (leftovers from #1653 / PR #1727).

What changed

• numId 0 is no list (r2-p1). <w:numId w:val="0"/> means "no numbering". ParProps::in_list() is now the list test in the terminal render, PDF export, Markdown, RTF, AutoFormat as you type, the Compare merger (which kept dropping an explicit 0, so the style's numbering came back) and the suite (list_markers, blank_base; eff_indent gives an explicit numId 0 no level step). The serializer still writes numId 0: it cancels a style's numbering.
• Decrease Indent reaches the margin (r2-p2). A list item with its own left indent goes to 0 and is written w:left="0" (serialize::pin_shadow_left_zero, idempotent, attribute order kept), so the level's indent no longer comes back and the item stays on its own-indent path in the session as after a reload. change_indent now records no undo step when a press would change nothing (step_indent compared on a clone); that also drops the empty step a Decrease at 0 recorded on a plain paragraph.
• Older builds' indent-less levels (r3-m3). Package::repair_list_indents() repairs docxy's reserved lists (9990/9991), sharing ensure_list's repair. Terminal docxy and docxwasm run it before Increase/Decrease Indent; the suite runs it after an indent that made an undo step (Shift+Tab, Ctrl+M, ribbon/KeyTips/harness act, Repeat). The suite draws levels from ilvl, so there the repair is for the saved file (Word, Pages).
• CLAUDE.md: a short "Lists" note.

Testing

New unit tests: render, PDF export, Markdown, RTF, AutoFormat, serializer and Compare for numId 0; editor tests for the margin pin, its idempotence (byte-identical w:ind, no undo step) and Increase after it; package tests for the repair (other list byte-identical, no part created, second call a no-op); a terminal docxy test through the ribbon act and Ctrl+M; suite tests for list_markers/blank_base and eff_indent.
cargo fmt --all --check, clippy -D warnings (docxcore, docxy, docxwasm, suite), cargo test -p docxcore -p docxy -p docxwasm (2794 passed), cargo test --manifest-path suite/Cargo.toml (2687 passed).
The suite's indent call sites have no unit seam (Docxy cannot be built in a test); they are covered by the package test and by reading them. No .uit case: no harness verb reads numbering.xml.

Review

revmux round 1 (4 Claude reviewers): 0 Major; 2 minor doc-comment errors, 1 immaterial duplication and 1 pre-existing suite eff_indent gap fixed in eb99c49; 1 pre-existing finding (style-numbered item at 0) deferred as a follow-up, as is the Paragraph dialog's set_indent(0) on a list item (planned out of scope): both in #1792.
review stopped: round 1 had no Major; all findings fixed

🤖 Generated with Claude Code

https://claude.ai/code/session_011yWYrLAGAD6qrej5aEktVD

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 97.58308% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docxwasm/src/bridge.rs	20.00%	4 Missing ⚠️
docxcore/src/editor.rs	96.87%	3 Missing ⚠️
docxy/src/main.rs	97.91%	1 Missing ⚠️

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[yeroo]

Merged automatically (auto-merge is on for this checkout): review stopped: round 1 had no Major; all findings fixed; merge rounds: 1 CI fix round (suite cargo fmt, formatting only); whole suite green on 02764ae (11301 tests); merge-check ok.

Leftovers: #1792 (checklist):

• r1-p2 (minor, review r1, pre-existing, docxcore/src/editor.rs:4107): Decrease Indent to 0 on a style-numbered list item brings the level indent back
• plan-setindent (minor, planned out of scope, docxcore/src/editor.rs): Paragraph dialog left indent 0 on a list item brings the level indent back

No disputed findings. Not filed, as they are design choices rather than work: repairing old-build levels at load (rejected in the plan) and the suite's own numIds 1/2.