v0.7.1

[0.7.1] - 2026-05-09

Fixed

• Screenshot requests now include the required id field, matching
  the renderer 0.7.1 wire protocol. Without it the renderer logged a
  decode error and Bridge.screenshot timed out after 30 seconds.
• Screenshot assertions now save a PNG alongside the .sha256 hash.
  The PNG is written when rgba_data is present (headless and windowed
  backends). Pass png: false to assert_screenshot/2 or
  assert_screenshot_match/3 to write the hash only. The .sha256 file
  is the actual CI assertion; the PNG is a human convenience for visual
  inspection.
• SocketAdapter JSON buffer accumulation is now O(n) instead of
  O(n^2). Incoming TCP chunks are accumulated in an iolist and only
  materialized to binary when a newline arrives. The overflow check now
  runs against the tracked size before any allocation, preventing
  timeouts on slow networks or tight socket buffers.