docs: errors.md com 69 itens e comportamento de cada falha

Terceira rodada contra a origem recuperou 6 imagens de preservação (6433,
6520, 6656, 7529, 7939, 8396). Os 69 restantes estão classificados pelo que a
origem faz: 500 na sequência da preservação, travamento cortado em ~300 s ou
~30 s, ou falha de rede. A forma canônica por nome também devolve 500, e
Range não ajuda porque o servidor não envia nem os cabeçalhos.

Contagens atualizadas no README, MANIFEST e TODO: 12.991 itens com
preservação e 41.450 objetos no ledger.

pipeline/baixa-curl-lentos.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Baixa por curl, em serie e com timeout longo, os itens de errors.md.
+# Descoberta de 13/09: a origem serve esses bitstreams a ~11 KB/s; o que
+# parecia "erro de rede" no navegador era estouro de tempo. Alguns voltam 403
+# (bloqueio Cloudflare a cliente sem sessao) -- esses ficam para a aba.
+UA="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36"
+B=https://brasilianafotografica.bn.gov.br/brasiliana/bitstream/20.500.12156.1
+ok=0; b403=0; b500=0; outro=0
+while IFS='|' read -r id seq arq; do
+  [ -z "$id" ] && continue
+  nome="BRAS__20.500.12156.1_${id}__$(python3 -c "import urllib.parse,sys;print(urllib.parse.unquote(sys.argv[1]))" "$arq")"
+  [ -f "$HOME/Downloads/$nome" ] && continue
+  code=$(curl -sL --max-time 600 -o "$HOME/Downloads/.parcial" -w "%{http_code}" \
+    -H "User-Agent: $UA" -H "Accept: image/*,*/*;q=0.8" \
+    -H "Referer: https://brasilianafotografica.bn.gov.br/" --compressed "$B/$id/$seq/$arq")
+  sz=$(stat -f %z "$HOME/Downloads/.parcial" 2>/dev/null || echo 0)
+  if [ "$code" = "200" ] && [ "$sz" -gt 1024 ]; then
+    mv "$HOME/Downloads/.parcial" "$HOME/Downloads/$nome"; ok=$((ok+1)); echo "ok   $id  $((sz/1024)) KB"
+  else
+    rm -f "$HOME/Downloads/.parcial"
+    case "$code" in 403) b403=$((b403+1));; 500) b500=$((b500+1));; *) outro=$((outro+1));; esac
+    echo "erro $id  http=$code  ${sz}B"
+  fi
+  sleep 2
+done < faltantes-v3.compacto.curl
+echo "FIM: ok=$ok 403=$b403 500=$b500 outros=$outro"

pipeline/falhas-500-2026-09-13.txt

@@ -1,74 +1,69 @@
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+20.500.12156.1/6555
+20.500.12156.1/6568
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 20.500.12156.1/8781
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pipeline/faltantes-v3.compacto.curl

@@ -0,0 +1,74 @@
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+6520|1|007_IMG_1008t.jpg
+6545|1|CC-05-01-015-3.jpg
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+6656|2|imagem.jpg
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pipeline/rejeitar-sha.txt

@@ -0,0 +1 @@
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pipeline/restantes.compacto.txt

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