- Support for `cuda-gdb` and `compute-sanitizer` (pass the right arguments to cudajit).

- Inline declarations for (non-differentiable) tensors in the `%cd` syntax.

- A minimal wrapper `Sync_backend` creating CPU backends with a single device only, where all calls are synchronous. (It's a baseline and helps debugging.)

- In progress: proper (condition variables based) scheduler. The legacy scheduler (pipes based) kept for now as baseline and to help debugging.

- Documentation for the syntax extensions.

- `%op` syntax: when under a `~config` parameter, refine the inline declared params' labels with `config.label`.

- `%op` syntax: incorporate the input tensor's (if any) label in the resulting tensor's label.

- Comments in config files using the line prefix `~~`.

- A template for C-syntax backends, refactoring CC and CUDA backends.

- Improvements to handling of tensor node labels, and to the `Tnode.debug_name` function.

- Output files generated by backends, and files generated by logging, in separate subdirectories.

- C-syntax logging: also output the pre-assignment value when logging an assignment.

- Migrated to ppx_minidebug 2.0 with the benefits it brings: no runtime passing, `Utils.settings.log_level` unified with ppx_minidebug's log levels.

- Allow verifying that non-embedded tensor nodes of the tensor(s) associated with a linked code are already in the context passed to `link` (resp. `link_batch`), since they won't get introduced into the context. It is the responsibility of helper functions (such as those in `Train`) to ensure the check.

- Fixed both known and newly discovered shortcomings of the syntax extensions.

- In particular, `%op` syntax: lift `~config` applications out of (tensor) functions.

- Multiple other tiny fixes.