feat(newos4): filter network-class auto reports at ingest — count, don't file

The debug supervisor files an auto report for any failed fetch, so a flaky phone connection or a
retired endpoint became a review card. One cluster held 14 407 + 1 031 occurrences and produced
3 of the 19 cards in the queue; 10 of 21 items reviewed on 2026-10-26 were noise for this reason.

api/debug/report.php: an auto report whose *every* error is network-class (fetch failed /
failed to fetch / network error / load failed / aborted / signal is aborted / ERR_INTERNET_*)
now increments data/debug/network_failures.json (per day, per source path, top 40 kept) and
returns 202 {filtered:"network"}. No RPT file, no card.

Never filtered: any report with auto=false (user content), and any auto report carrying a
stack/TypeError, i.e. a real defect. Verified on a throwaway tree and live through nginx:
  auto network poll.php   -> 202 filtered, no file
  auto network /ollama/   -> 202 filtered, no file
  auto TypeError + stack  -> 201 filed (RPT-20261026-134455-95f10612)
  user report w/ "fetch"  -> 201 filed (RPT-20261026-134455-ab0f2cd4)
Live: counter total=1 by_source {'/spaces/newos4/api/chat/poll.php': 1}, reports stayed at 19.

The dashboard now shows the counter instead of silence:
  "🌐 1 network failure counted at ingest today, not filed as cards — /spaces/newos4/api/chat/poll.php ×1"

0 files changed, 0 insertions, 0 deletions