Refinements to key live script demo

[vijayiyer05]

Converted the key demo live script (tiny_ophys_inference_detailed) to plain-text Live Code format.

Applied suggested small refinements from a short design review by Deep Learning Toolbox team. Thanks to @meghendra.

Notable learning from the review: the current approach of porting Keras models to TensorFlow (done in +interop) may not be needed for future zoo models published by originator in Keras, given the new importNetworkFromKeras function which supports TensorFlow 2.16+.

[stevevanhooser]

Thanks @vijayiyer05 — and thanks to @meghendra for the review feedback baked in
here. Noting that I've read through this so it isn't sitting unattended.

I like the direction, particularly the move to plain-text Live Code. Being able
to diff and merge the narrative and the code in plain git, rather than only
through the MATLAB Comparison Tool, is a real win for a repo like this one.

A few things I'd like to settle before it comes out of draft — mostly so we know
which are yours and which are mine:

1. Does the .mlx stay? As it stands this adds
   examples/tiny_ophys_inference_detailed.m alongside the existing .mlx. Two
   copies of the flagship demo will drift apart. Replace, or keep both through a
   transition?

2. README and File Exchange links. The "View on File Exchange" and "Open in
   MATLAB Online" badges still point at tiny_ophys_inference_detailed.mlx. If
   the .m becomes canonical those should move with it — happy to take that on.
   Do you know whether File Exchange renders plain-text live code yet?

3. Minimum MATLAB release. My understanding is the plain-text format is
   R2025a and later (setting aside the R2024b beta desktop). Opened in anything
   older the file still runs, but as a plain script — no formatted text,
   interactive controls, or stored output. We don't state a minimum release in
   the README today; if we adopt this format I think we should. Are you
   comfortable with R2025a as the floor for the examples?

4. Your importNetworkFromKeras note is a good find and shouldn't stay buried in
   a PR description. Want me to open an issue to track possibly retiring the
   Keras→TensorFlow conversion in +interop?

No rush on any of it — happy to review properly whenever you mark it ready.