Record the reading cost

docs/reading-cost.md

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 - `.gitignore` 1
 - `AGENTS.md` 1
 - `CHANGELOG.md` 1
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+## Reading cost, chunk c1a0ce6b3d32, finished 2026-10-11T18:41:31Z
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+76079 new input tokens before the first commit.
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+Read most (opens and searches):
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+- `todo.md` 10
+- `docs/decisions.md` 6
+- `README.md` 4
+- `AGENTS.md` 2
+- `data-import/geo-se.py` 2
+- `CHANGELOG.md` 1
+- `data-import/geo-us.py` 1
+- `data-import/geo.py` 1