Changes in version 0.0.9 (2026-10-14)                  

  - retro_color_rgb() and retro_color_rgba() now parse each color with
    grDevices::col2rgb() and re-format it with grDevices::rgb(), instead
    of slicing and concatenating the string. magick::image_raster()
    returns color specifications rather than guaranteed hex, and for a
    fully transparent pixel it returns the name "transparent", which the
    old string handling turned into the invalid "transpa" and
    "transpaff". The 0.0.8 fix addressed this by flattening at the entry
    point, but several internal steps build images from character
    matrices and never pass through retro_image_png(), so the error
    persisted on platforms whose ImageMagick build retains an alpha
    channel. Fixing the helpers themselves covers every path. Output is
    unchanged for hex input.
  - Clarify in retro_image_png() that flattening onto white is what
    makes a partially transparent source image tractable: the blend a
    reader sees is the color to digitize, so compositing is not
    interchangeable with discarding the alpha channel.

                        Changes in version 0.0.8                        

  - retro_image_png() now flattens the source image onto an opaque white
    background, and retro_agent_class$register() routes every format
    through it instead of copying PNG files verbatim.
    magick::image_raster() reports a fully transparent pixel as the
    color name "transparent" rather than as hex, which retro_color_rgb()
    truncated to "transpa" and retro_color_rgba() extended to
    "transpaff", both invalid color names that stopped the pipeline.
    Removing the alpha channel once at the entry point means no later
    step encounters a non-hex pixel value.

                        Changes in version 0.0.7                        

  - Collapse tool call cards in retro_app() by default instead of
    expanding them.
  - Top-align and left-align the Step 2 greeting in retro_app() instead
    of centering it vertically.

                        Changes in version 0.0.6                        

  - Fix the cancel button in retro_app(): the chat turn now runs in a
    shiny::ExtendedTask, so a cancel click can actually reach
    stream_controller() and stop the stream instead of being processed
    only after the response already finished. Since the tools now run
    outside a reactive context, they read state via shiny::isolate().
  - retro_chat_replay_simulation()$stream_async() now returns a promise
    instead of the finished text. A finished string is not a stream, so
    retro_app() rendered the replay as an already-complete message and
    the stop button never appeared.
  - Give retro_app() a theme argument for bslib theming, and put a
    light/dark mode toggle in the top right of the main panel.
  - Add a preload hint for shinychat's JS and CSS bundle in retro_app(),
    so the browser starts fetching it in parallel with other blocking
    <script> tags instead of only after they finish, and the greeting
    renders sooner.
  - Improve the error messages of the quantize and label tools so the
    model knows when the user forgot to supply a source image.

                        Changes in version 0.0.5                        

move to shinychat 0.5.0.

                        Changes in version 0.0.4                        

  - Use a simulated Kaplan-Meier image for examples and tests.
  - Reduce content returned from tools, especially retro_tool_label().
    Mostly this is a workaround to avoid
    https://github.com/tidyverse/ellmer/issues/1136, but it also
    somewhat declutters the context window.
  - Add a type argument to quantiles() ("survival" default, or
    "incidence") controlling how probabilities is interpreted, default
    probabilities to descending (c(0.75, 0.5, 0.25)), and always report
    both survival and incidence columns in the output, sorted
    chronologically regardless of input order or type.
  - Add new methods probabilities() and counts() to the agent class.
  - Add retro_app(), a Shiny app interface for retroglyph.

                        Changes in version 0.0.3                        

  - Make retro_data_path() more robust to poorly classified
    anti-aliasing debris: before choosing a curve's rightmost pixel,
    drop connected components of the target color smaller than 8 times
    the line width.

                        Changes in version 0.0.2                        

  - Document AI Registry and Cyber SAE approvals.

                        Changes in version 0.0.1                        

  - First version.