#1055 Replace the lede doctrine with corpus-derived guidance and retire the changelog-writer

[williamthorsen]

What

Replaces the lede doctrine in lede-voice.md with corpus-derived guidance: The change is the subject of a lede, mechanism is substance rather than detail to route away, and 11 per-type sections, most anchored by an author-approved exemplar, take the place of four general rules.

The changelog-writer subagent is removed. summarize-change now composes the ## What section inline from the diff, and voice-checklist, commit, and merge-pr reach the doctrine by reference.

Why

Nearly every agent-written lede was rewritten by hand before merge: the lede-decision corpus records 167 revised decisions against 25 accepted, and the author comments name the guidance itself as the cause. The doctrine's user-facing-outcome frame fit feat and fix alone, its rules were cut-screens that an unreadable draft could fully satisfy, and the dispatch pipeline required a mechanism-free seed that deleted the substance of refactor, docs, tooling, and deps changes before composition began.

Details

🎉 Features

• lede-voice.md drops from 245 lines to 73. The four numbered rules, the identifier ban, and the jargon section give way to a stance (the change is the subject; every sentence reports an effect of the diff; mechanism is substance; name things; punch the highlights; claims match the diff), a form section, eleven per-type sections, a Don't list of corpus-attested failure modes, an over-cutting counterweight, and distilled title rules.
• Each per-type section covers one work type or a group of them, so every changelog-contributing key in work-types.json is reachable. Eight carry an exemplar drawn from the corpus.
• The stance requires the opening to name the changed artifact or subsystem before the reader absorbs what the change did to it.
• summarize-change composes ## What as its last step, from the branch diff and the ## Why and ## Details sections written before it, and audits the draft against voice-checklist before saving.
• voice-checklist becomes a six-item pre-save audit over subject, type, names, highlights, claims, and cuts, pointing at the doctrine for the substance rather than restating its rules.

🪦 Removed

• 🚨 Breaking: The changelog-writer subagent is removed, along with its write/rewrite/audit modes and the outcome-seed dispatch contract that fed it. Lede composition moves into summarize-change; the triage collection drops the member.

🐛 Bug fixes

• commit points at the doctrine's Titles section by anchor instead of the retired "Title application" heading.
• merge-pr's fresh-composition path and summarize-change's newspaper-style note no longer instruct the retired outcome frame.
• The doctrine states where the release-notes register comes from, and records that a revert carries the work type of the change it undoes.

🧪 Tests

• The create-pr closure test drops its assertion on the retired subagent.

📚 Documentation

• _partials/README.md records that an include directive's leading whitespace governs recognition alone, so a directive cannot sit inside a list item.

Closes #1055

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Dependency audit

Production dependency audit passed.