Add Pydantic-based postprocessor configuration framework

HISTORY.rst

@@ -33,6 +33,24 @@ are continually evolving. Contributions and feedback are welcome!
 Releases
 ********
 
+0.6.0 (2026-02-18)
+___________________
+
+Breaking Changes
+----------------
+* CLI: Replaced `--processor` option with `--processor-config` (required) in `rompy postprocess` and `rompy pipeline` commands.
+* API: `ModelRun.postprocess()` now requires a `BasePostprocessorConfig` instance instead of a string processor name.
+* Pipeline: `LocalPipelineBackend.execute()` now accepts a `BasePostprocessorConfig` instance for the `processor` parameter.
+
+New Features
+------------
+* Added Pydantic-based postprocessor configuration framework (`BasePostprocessorConfig`, `NoopPostprocessorConfig`).
+* Added `--processor-config` CLI option for specifying postprocessor configuration files (YAML/JSON).
+* Added `rompy.postprocess.config` entry point group for registering postprocessor configurations.
+* Added `rompy backends validate --processor-type` for validating postprocessor configurations.
+* Added comprehensive test suite for postprocessor configuration framework.
+* Added example postprocessor configuration files.
+
 0.5.0 (2025-07-13)
 ___________________
 

README.md

@@ -18,6 +18,7 @@ Key Features:
 - Templated, reproducible model configuration using pydantic and xarray
 - Unified interfaces for grids, data, boundaries, and spectra
 - Extensible plugin system for models, data sources, backends, and postprocessors
+- Pydantic-based postprocessor configuration with CLI support
 - Robust logging and formatting for consistent output and diagnostics
 - Example notebooks and comprehensive documentation for rapid onboarding
 - Support for local, Docker, and HPC execution backends
@@ -28,6 +29,42 @@ rompy is under active development—features, model support, and documentation a
 
 See <https://rom-py.github.io/rompy/>
 
+# Postprocessor Configuration
+
+ROMPY now supports Pydantic-based postprocessor configuration via YAML/JSON files.
+
+## Usage
+
+### Postprocess with a config file
+
+```bash
+rompy postprocess model_config.yml --processor-config processor.yml
+```
+
+### Pipeline with postprocessor config
+
+```bash
+rompy pipeline model_config.yml --processor-config processor.yml
+```
+
+### Validate a postprocessor config
+
+```bash
+rompy backends validate --processor-type noop processor.yml
+```
+
+## Example Configuration
+
+```yaml
+type: noop
+validate_outputs: true
+timeout: 3600
+env_vars:
+  DEBUG: "1"
+```
+
+See `examples/backends/postprocessor_configs/` for more examples.
+
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