Edmund docs and writing

Date-stamped 2026-07-09. Every claim below was verified against the files on main at that date; re-verify paths before trusting this after major reorganizations.

When NOT to use this skill

This skill is for prose: what to write, where it lives, how it should read.

1. The docs-of-record map — one home per fact

Every fact has exactly one home; everywhere else gets a pointer. All paths exist and are current as of 2026-07-09.

Note: misc/backlog.md and docs/ROADMAP.md currently duplicate the v1.0.0/v1.x/v2.0.0 sections (backlog carries an extended copy). ROADMAP is the public plan; backlog is the working list. When they disagree, treat ROADMAP as the versioned commitment and backlog as scratch — and mention the drift to the maintainer rather than silently reconciling.

2. Where does a new fact go — decision table

Route the fact FIRST, then write. One home; cross-reference from elsewhere.

The same-PR rule is the load-bearing one. Doc updates that ride the code PR actually happen (see cf10741, b600e12, c4a602b in history); doc updates deferred to "later" don't.

3. House style

Derived from reading ARCHITECTURE.md and the investigation docs. Match it.

• Dense, specific, evidence-first. State the mechanism and the proof, not vibes. "Verified against that exact API" (§8 Sparkle bullet), timestamps and selection ranges quoted verbatim in investigation docs.
• Bold lead-ins for gotcha bullets, then the explanation: - **Stale release builds**: .... Scannable list, detail inline.
• Backticks for every file, symbol, flag, and command: `recomposeDirty`, `+EditFlow` (the extension-file shorthand), `-debug.reproScript`.
• One-line repro pointers, not embedded essays: "See misc/bug-repros/image-blank-after.mov", "grep ~/.edmund/logs for repairing content above origin".
• Honest status labels. The docs say "unconfirmed live", "theory + targeted repair, not a confirmed kill", "Verification limits (honest gaps)", "the test documents intent; the leap only reproduces under live layout". Never claim verification you didn't do. No oversell.
• Section anchors as cross-refs: "see §8", "ARCHITECTURE §13" — used across ARCHITECTURE, AGENTS.md, before-you-release.md. If you renumber sections, grep the repo for § and fix every reference.
• Address "you", the next agent/engineer: "will bite you", "Context for anyone who sees the bug again", "Next time it happens: ...".
• Record what failed, not just what worked — investigation docs keep the overturned theories and the phantom fixes (stale-binary trap) because the dead ends are the reusable knowledge.

Commit messages (from git log --oneline -50)

Mixed but patterned: conventional prefixes dominate for fixes and docs — fix(scope): ... (scopes seen: editor, layout, scroll, undo, release-workflow, changelog-to-html), docs: ..., occasional refactor:, appcast: add Edmund X.Y.Z, release X.Y.Z. Chores and README work often use plain imperative subjects ("Update README", "Add assets for README"). Branches: fix/<slug>, docs/<slug>, chore/<slug>. When in doubt: fix(scope): for behavior changes, docs: for doc-only commits, plain imperative for chores. Never auto-push, PR, or merge — only when asked.

4. CHANGELOG format — machine-read, get it exact

.github/workflows/release.yml extracts release notes with:

awk "BEGIN{p=0} /^## \[${VERSION}\]/{p=1;next} p && /^## \[/{exit} p{print}"

So the section header MUST be ## [x.y.z] at line start, version matching CFBundleShortVersionString exactly; the section ends at the next ## [. scripts/changelog-to-html.py converts the same section to HTML for Sparkle's update dialog (it folds wrapped bullet lines into their <li> — wrapping bullets is safe). Full pipeline: edmund-release-and-operate.

House format (verify against the file; current entries follow this):

## [0.1.4] — 2026-07-XX

### Fixed
- <User-facing symptom, past tense optional> ([docs](docs/<topic>-investigation.md)) [#NNN](https://github.com/I7T5/Edmund/issues/NNN)

---

• Em dash between version and ISO date; --- separator between versions.
• Subsections used so far: ### Added, ### Changed, ### Fixed (Keep a Changelog 1.1.0 vocabulary).
• Entries describe the user-visible effect, not the mechanism; mechanism lives in the linked investigation doc / ARCHITECTURE.
• An optional free-text line under the header is fine (0.1.2 has one) — the awk extraction includes it.

5. The investigation-doc template

Derived from docs/investigations/delete-drift-investigation.md (6 rounds) and docs/investigations/viewport-glitch-investigation.md. Both open with why the doc exists ("Context for anyone who sees the bug again... records the trail end to end") and name the fixing commits/branch up front. Chronicle structure: each recurrence is a new ## Round N appended to the same doc — symptom → diagnosis → root cause → fix → verification, with limits stated.

Skeleton (copy-paste):

# <Area> "<bug nickname>" — investigation notes

Context for anyone who sees this again. <One line on why it was hard:
intermittent / state-dependent / looked nothing like its cause.>

Fixed on branch `fix/<slug>`, commits: `<sha>` — <subject>, ...

## Symptom

<Exact user-visible behavior. Bulleted key properties, each a discriminating
fact ("caret-only, text fine"; "never right after launch"). Evidence
pointers: `misc/bug-repros/<file>`, `~/.edmund/logs/...`.>

## How it was diagnosed

1. <Numbered steps in the order they happened, including overturned
   theories and WHY each clue narrowed the space.>

## Root cause

<The mechanism, in bold where it matters. Explain why every symptom
property follows from it.>

## The fix

<What changed, in which file, and why that shape (defenses tried and
rejected count too).>

## Verification

<Tests added, live repro results, suite count. Then an honest limits
subsection: what was NOT reproduced/confirmed, and the breadcrumb to grep
for if it recurs.>

## If it ever recurs

<Ordered checks for the next investigator: which invariant/log/flag to
inspect first.>

## Round 2: <one-line summary>   ← append on recurrence, same structure

After writing one: add the one-bullet gotcha to ARCHITECTURE §8 with a pointer, add the CHANGELOG entry with a ([docs](docs/...)) link, and check the corresponding misc/backlog.md box (or move it under On-going bugs).

6. Maintenance duties

Do these whenever you touch the relevant doc; they rot otherwise.

• ARCHITECTURE placeholders: §9 and §10 end with italic "Add new ones here" / "track code-debt here" lines — keep them last in their lists so the invitation stays visible.
• ROADMAP Last updated: — bump the date on any edit.
• Backlog hygiene: check - [x] boxes when a fix ships (move to ## Done only if following the existing pattern — completed items live there); keep repro pointers valid; don't reorder the maintainer's priority sorting.
• README's inline HTML comments are the maintainer's own edit notes (e.g. <!-- Replace "minimal" with ... -->) — leave them unless acting on them.
• At release: CHANGELOG section header ↔ Info.plist version ↔ appcast <item> must agree; the checklist is misc/before-you-release.md, the mechanics edmund-release-and-operate.
• Section renumbering in ARCHITECTURE: grep the whole repo (docs, misc, AGENTS.md, skills) for § references before and after.
• Never edit test-files/todo.md — the maintainer owns it.

Provenance and maintenance

Written 2026-07-05 against main at fe8a1f5 (release 0.1.3). Sources, all read directly: docs/ARCHITECTURE.md (header, §8–§13), README.md, CHANGELOG.md, docs/ROADMAP.md, misc/backlog.md, docs/investigations/delete-drift-investigation.md, docs/investigations/viewport-glitch-investigation.md, docs/dev-guides/live-repro-guide.md (§1), misc/before-you-release.md, misc/how-to-release.md, root AGENTS.md, .github/workflows/release.yml (awk extraction quoted verbatim), git log --oneline -50 (commit-style tally), directory listings of docs/ (architecture/, investigations/ incl. archives/, dev-guides/), misc/, misc/bug-repros/, LICENSES/.

§1 map re-verified 2026-07-09 against the docs/ reorg (investigation docs split into docs/investigations/ + docs/investigations/archives/; docs/live-repro-guide.md moved to docs/dev-guides/).

Maintain this skill when: a doc of record moves or splits (update the §1 map), ARCHITECTURE sections are renumbered (fix every § reference here), the CHANGELOG extraction in release.yml changes (§4 quotes it), or a new investigation doc establishes a better template. Keep the one-home-per-fact rule itself stable — it is the point of the skill.