feat: OCR scans with tesseract, drop docling from the default path. (#33)

pdftotext still wins on born-digital PDFs. Empty text layers go through
pdftoppm + tesseract eng+deu. Optional OCR_ENGINE=paddle. Gitea #6.

docs/roadmap.md

@@ -32,11 +32,18 @@ FROM_FILE / HAS_VERSION / AUTHORED.
 `--with-chats` on rebuild (WhatsApp out of v1).
 [#19](https://git.produktor.io/eSlider/2dph/issues/19) CI recall SoT =
 `bin/brain/eval.go` via Zig.
+Epic [#16](https://git.produktor.io/eSlider/2dph/issues/16) closed.
+
+## v2
+
+[#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR — `pdftotext` then
+`pdftoppm` + tesseract `eng+deu`. Optional `ocr-paddle`.
+[#29](https://git.produktor.io/eSlider/2dph/issues/29) OQ1 contradiction
+resolution. [#30](https://git.produktor.io/eSlider/2dph/issues/30) OQ3 duckdb-md.
 
 ## Blockers
 
-None for epic #16. v2: [#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR,
-OQ1 contradiction resolution, OQ3 duckdb-md, OQ4 YAML-first leafs.
+None for epic #16 (closed). Remaining v2: OQ1, OQ3, OQ4.
 
 ```
 question
@@ -51,8 +58,8 @@ question
 
 ## Not v1
 
-[#6](https://git.produktor.io/eSlider/2dph/issues/6) OCR (OQ2), OQ1
-contradiction resolution, OQ3 duckdb-md export, OQ4 YAML-first leafs.
+OQ1 contradiction resolution, OQ3 duckdb-md export, OQ4 YAML-first leafs.
+OCR (OQ2) is in: tesseract, not docling.
 
 ## Close epic #16 when
 

docs/runbook.md

@@ -16,6 +16,7 @@ No laptop-absolute paths. Config lives in env files under `$HOME/.config/brain/`
 - Go (see `go.mod`)
 - Python 3.12 + [uv](https://docs.astral.sh/uv)
 - Optional: Docker, Zig CGO via `bin/cgo/zig` (not gcc)
+- Optional: poppler (`pdftotext`/`pdftoppm`) + tesseract `eng+deu` for mail OCR
 
 ```bash
 uv venv .venv