docs: add dedicated breaking change notices to changelog

Author: Nytelife26

CHANGELOG.md

@@ -2,6 +2,37 @@
 
 ## [0.16.0](https://github.com/amperser/proselint/compare/0.14.0..v0.16.0) - 2025-11-14
 
+### 💥 Breaking Changes
+
+This release is not backwards compatible. The following breaking changes have been made.
+
+#### As a program
+
+- Python 3.9 is now end-of-life, and no longer supported
+- Different calling conventions. See `--help` for a full list of options
+  - `proselint --version` is now `proselint version`, for consistency with other linters
+  - `proselint` is now `proselint check`
+  - `proselint --dump-config` and `--dump-default-config` are now `proselint dump-config` and `dump-config --default`
+  - `--time` and `--clean` have been removed
+  - `--debug` is now `--verbose`
+  - `--json` and `--compact` are now `--output-format json` and `--output-format compact`
+- There is a new JSON output schema for `--output-format json`. This is [documented](https://github.com/amperser/proselint/blob/v0.16.0/docs/wire-schema.md), stable, and versioned. Plugins will require updates.
+- The on-disk cache has been removed
+
+#### As a library
+
+- The cache has been removed, along with all related features in `proselint.tools`
+- The `score` module has been removed
+- The build backend is now `uv_build`
+- The `topics` and `context` features of `proselint.tools` have been removed
+- The `_check` functions of `proselint.tools` have been replaced by classes in `proselint.registry.checks.types`
+- Checks are now specified with `Check` in `proselint.registry.checks`
+- Lint runs are executed with `LintFile` and return `LintResult`, both in `proselint.tools`
+- The `ppm_threshold` wrapper in `proselint.tools` has been replaced by `CheckFlags` in `proselint.registry.checks`
+- The `max_errors` wrapper in `proselint.tools` has been removed
+- `load_options` in `proselint.tools` has been replaced by the `proselint.config` module
+- `errors_to_json`  in `proselint.tools` has been replaced by `LintResult.into_dict`
+
 ### ⛰️  Features
 
 - *(registry)* Add strict padding for checks ([#1428](https://github.com/amperser/proselint/issues/1428)) - ([f1894bc](https://github.com/amperser/proselint/commit/f1894bccf5cb9344eca5daba64ad0b3ec8577784))