22 - the line container is markdown's, so the seam is the two spelling asks

AGENTS.md

@@ -365,7 +365,9 @@ someone spells it or pins it.
   choice, input consults it rather than restating it: the parser asks `commonMarkSpelling` which
   form the emitter picks, and `openingLinkTakesDirective` whether the line a paragraph's opening
   link starts forces the directive link, so no fixture the emitter writes can be refused, and a
-  spelling the emitter refuses gives its own error rather than a second name for it.
+  spelling the emitter refuses gives its own error rather than a second name for it. Those two asks
+  are the whole of `parse/` → `emit/`, so a grep for `../emit/` under `parse/` reads the seam
+  entire: what both directions read sits at the format level, a type included.
 - The attribute vocabulary is ADF's: `adf/` walks it and narrows each value to its kind, and a
   format spells the narrowed value. A spelling that re-checks the type is the check's second copy.
   Reading a spelling back is the format's own: the reader sits beside the spelling it inverts, so

src/markdown/emit/inline-line.ts

@@ -1,6 +1,7 @@
 import type { AdfMark, AdfNode } from '../../adf/document.ts'
 import type { InlineNodeModel } from '../../adf/inline-nodes.ts'
-import { assembleInlineLine, isSyntax, type InlineEscaping, type InlineSegment, type LineContainer, type NodeRange } from './line-escaping.ts'
+import type { LineContainer } from '../line-container.ts'
+import { assembleInlineLine, isSyntax, type InlineEscaping, type InlineSegment, type NodeRange } from './line-escaping.ts'
 import { carriedInline } from '../opaque-carry.ts'
 import { claimsLine, holdsNullCharacter, trimTrailingSpace } from '../commonmark/grammar.ts'
 import { commonMarkLink, linkHref, markSpelling, spellMarkAttributes } from '../mark-spellings.ts'

src/markdown/emit/line-escaping.ts

@@ -1,3 +1,4 @@
+import type { LineContainer } from '../line-container.ts'
 import { backslashEscape, escapesLineClaim, inlineHtmlConstruct, opensBracketedAutolink, opensEmailAutolink, type LinePosition } from '../commonmark/grammar.ts'
 import { backtickRun, closingBacktickRun } from '../commonmark/backtick-runs.ts'
 import { claimsDirectivePrefix } from '../directive-syntax.ts'
@@ -21,8 +22,6 @@ export type AssembledLine = { line: string; openingLinkAsDirective?: true; unspe
 
 type ScanLine = { position: LinePosition; start: number; text: string }
 
-export type LineContainer = 'heading' | 'paragraph' | 'table-cell'
-
 type EmittedDelimiter = { closes: boolean; offset: number; pair: number; width: number }
 
 type EmittedRun = { canClose: boolean; canOpen: boolean; character: string; delimiters: EmittedDelimiter[]; length: number; start: number }

src/markdown/line-container.ts

@@ -0,0 +1 @@
+export type LineContainer = 'heading' | 'paragraph' | 'table-cell'

src/markdown/parse/inline-content.ts

@@ -1,7 +1,7 @@
 import type { AdfMark, AdfNode } from '../../adf/document.ts'
 import type { DirectiveSpan, NestedSpans } from '../directive-syntax.ts'
 import type { EmphasisPairing } from '../commonmark/emphasis-matching.ts'
-import type { LineContainer } from '../emit/line-escaping.ts'
+import type { LineContainer } from '../line-container.ts'
 import type { LinkDefinition } from '../commonmark/link-syntax.ts'
 import { backslashEscape, decodeTextEscapes, inlineHtmlConstruct, readBracketedAutolink, readEmailAutolink, trimTrailingSpace } from '../commonmark/grammar.ts'
 import { backtickRun, closingBacktickRun } from '../commonmark/backtick-runs.ts'

src/markdown/parse/markdown-to-adf.ts

@@ -2,7 +2,7 @@ import type { AdfDocument, AdfNode } from '../../adf/document.ts'
 import type { Block, DirectiveBlock } from './blocks.ts'
 import type { BlockDirectiveNode } from './directive-nodes.ts'
 import type { ConvertFault } from '../../result.ts'
-import type { LineContainer } from '../emit/line-escaping.ts'
+import type { LineContainer } from '../line-container.ts'
 import type { LinkDefinitions } from './inline-content.ts'
 import { carryName, readCarriedBlock } from '../opaque-carry.ts'
 import { commonMarkSpelling, type SpellingMemo } from '../emit/adf-to-markdown.ts'

todo-history.md

@@ -1010,6 +1010,14 @@ The done `todo.md` items in full, as they were written. `todo.md` keeps a one-li
       `blockDirectiveForm`, `blockArgument` and the `spell*Directive*` family keep the word,
       naming the spelling rather than the node.
 
+- [x] **22 — `LineContainer` sits at the markdown level (`0.2.0`).** Two of the four
+      `parse/` → `emit/` imports fetch this type from `emit/line-escaping.ts`, camouflaging the two
+      that are the deliberate spelling consultation. Move it, and name those two in §11 as the whole
+      of that surface, so a reviewer checks the seam with one grep.
+      **Done** (2026-09-21): the type is `markdown/line-container.ts`, read by both directions, so
+      `parse/` imports `emit/` twice — `commonMarkSpelling` and `openingLinkTakesDirective` — and
+      §11 says those two are the whole of the seam a `../emit/` grep under `parse/` reads.
+
 ## 5 — Ship `0.1.0`
 
 - [ ] **5 — Ship `0.1.0`.** Only the maintainer's own acts are left (§15): make the Gitea repo

todo.md

@@ -56,10 +56,6 @@ chunk clearing a §11 seam.
       upward, so the first raise to the measured figure reddens a run that changed nothing. Make
       the measurement repeatable, or state the number the floor may be raised to and why it is not
       the measured one.
-- [ ] **22 — `LineContainer` sits at the markdown level (`0.2.0`).** Two of the four
-      `parse/` → `emit/` imports fetch this type from `emit/line-escaping.ts`, camouflaging the two
-      that are the deliberate spelling consultation. Move it, and name those two in §11 as the whole
-      of that surface, so a reviewer checks the seam with one grep.
 - [ ] **32 — The mark depth `adf/` counts is stated in ADF's terms (`0.2.0`).**
       `document.ts`'s `markAttributeNesting` is `largestNesting - 3`, and both the comment above it
       and AGENTS.md §8 give the reason as markdown's: the block directive spells the whole mark set
@@ -292,6 +288,7 @@ chunk clearing a §11 seam.
 - [x] **19 — A home for what both formats read (`0.2.0`).**
 - [x] **20 — The give-way channel is unmistakable (`0.2.0`).**
 - [x] **21 — The ADF tables carry ADF's nouns (`0.2.0`).**
+- [x] **22 — `LineContainer` sits at the markdown level (`0.2.0`).**
 - [x] **28 — `emitLine`'s retry loop cannot spin (`0.2.0`).**
 - [x] **29 — The README reads raw HTML as refused for good (`0.2.0`).**
 - [x] **30 — AGENTS.md says each thing once (`0.2.0`).**