Problem

dump_defaults() in osipy/cli/config.py returns hard-coded YAML template strings from the _DEFAULT_TEMPLATES dictionary (lines 398–532). These templates are manually maintained and have already drifted from the actual Pydantic config classes — for example, delay fitting options (fit_delay, delay_bounds) exist in the fitting API but are absent from the templates.

As we add more parameters across modalities, keeping hand-written templates in sync with the Pydantic models is unsustainable.

Proposal

Replace the hard-coded _DEFAULT_TEMPLATES strings with auto-generated YAML derived from the Pydantic model schemas. For example:

• Use model_json_schema() or model_fields to iterate over each config class
• Emit field names, defaults, types, and descriptions as commented YAML
• Ensure the output stays human-readable (grouped by section, with comments from Field(description=...))

This guarantees that every field defined in the Pydantic config classes automatically appears in the config dump, eliminating drift.

Affected code

• osipy/cli/config.py — _DEFAULT_TEMPLATES dict and dump_defaults() function
• All Pydantic config classes: DCEFittingConfig, DCEPipelineYAML, DSCPipelineYAML, ASLPipelineYAML, IVIMPipelineYAML, etc.

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