Record the reading cost

docs/reading-cost.md

@@ -151,3 +151,16 @@ Read most (opens and searches):
 - `todo.md` 4
 - `docs/decisions.md` 3
 - `CHANGELOG.md` 2
+
+## Reading cost, chunk 5c2c2691022d, finished 2026-10-09T11:08:17Z
+
+45283 new input tokens before the first commit.
+
+Read most (opens and searches):
+
+- `README.md` 2
+- `package.json` 2
+- `CHANGELOG.md` 1
+- `ci.sh` 1
+- `docs/decisions.md` 1
+- `todo.md` 1

todo.md

@@ -6,7 +6,7 @@
 
 `Bar = 9`
 
-`Next ID = 92`
+`Next ID = 93`
 
 | Goal | W |
 |---|---|
@@ -32,6 +32,7 @@
 | 60 | 0.2.0 | decision | **Collect the questions `parse/` asks `emit/` into one named module.** | 3 | 4 | 2 | 6 | 2 | 10.7 |
 | 59 | 0.2.0 | decision | **Group the directive grammar into `src/markdown/directive/`, move `Read<T>` to `result.ts`, and move `Flavour` and `flavourClaims` to `markdown/flavour.ts`.** | 3 | 5 | 2 | 6 | 2 | 10.4 |
 | 62 | 0.2.0 | decision | **Move the portable flavour's reading out of `parse/` and its writing out of `emit/` into `markdown/portable/`, so `emit/` no longer imports `portable/`.** | 4 | 5 | 2 | 6 | 2 | 9.4 |
+| 92 | 0.2.0 |  | **Lower the reading cost of the files a chunk reads most before its first commit.** | 2 | 4 | 2 | 4 | 1 | 9.0 |
 | 89 | 0.2.1 |  | **Build a `date`, `emoji`, `inlineCard`, `mention` or `status` holding no mark Atlassian's schema withholds from it, in every reader.** | 4 | 4 | 5 | 6 | 4 | 13.0 |
 | 33 | 0.2.1 | defect | **Emit a line in time linear in its mark runs, in `adfToLosslessMarkdown` and `adfToPortableMarkdown`.** | 4 | 5 | 6 | 9 | 9 | 8.7 |
 | 7 | 0.3.0 | decision | **Ship HTML: `adfToHtml`, `htmlToAdf`, and markdown to and from HTML composed through ADF, each call named by its flavour.** | 6 | 9 | 9 | 9 | 2, 4 | 25.8 |
@@ -120,6 +121,14 @@ Writing: `spellPortableBlock`, `quotedUnder`, `tryTaskList` and `taskBlocks` in
 `flavourClaims`. Every comprehension reader on 2026-10-03 named the portable flavour's spread across
 three directories.
 
+### 92. Lower the reading cost of the files a chunk reads most before its first commit.
+
+The last five chunks' median is 97329 new input tokens before their first commit, the five before
+them 66995. Read most over the last five, opens and searches: `README.md` 26, `docs/decisions.md`
+23, `src/markdown/parse/markdown-to-adf.test.ts` 19, `todo.md` 17, `spec/flavour.md` 13,
+`CHANGELOG.md` 10, `MIGRATION.md` 8, `src/markdown/parse/markdown-to-adf.ts` 7,
+`src/conformance/commonmark-spec.test.ts` 6, `corpus/commonmark-spec/exceptions.json` 5.
+
 ### 89. Build a `date`, `emoji`, `inlineCard`, `mention` or `status` holding no mark Atlassian's schema withholds from it, in every reader.
 
 `*!adf:mention[@a]{id=…}*` and `[!adf:status[Done]{…}](/u)` build a node holding `em` or `link`.