- Remove unused get_import_path (only used by deleted schema/builder)
- Remove unused class_name from catalog dicts
- Fix N+1: get_family_source_file uses get_args directly instead of
  rediscovering all types via discover_family_types

- Add parameters:/params: to _SECTION_HEADERS for docstring parsing
- Fix config_package_path to return parent of data_designer package so
  Path(base) / relative_file resolves correctly
- Use last occurrence of data_designer in _get_source_file to handle
  nested paths (e.g. dev checkouts)
- Return list of deduplicated files per family (get_family_source_files)
  instead of assuming all types live in one file
- Add config_builder_file to context output

- Use _get_source_file(DataDesignerConfigBuilder) instead of hardcoded
  string for config_builder_file, consistent with family file resolution
- Fix test assertion that assumed "config" in path (only true in dev)

- _get_source_file returns "" instead of absolute path when
  data_designer is not in the path, consistent with error branch
- Add Config Module section to context output pointing agent to
  the config module as the only part of the codebase to work with
- Rename config_package_path to config_module_path (returns config dir)

Schema rendering is no longer needed in the config layer — the agent
CLI now provides file paths so agents can read source files directly.

- Redeclare `name: str` in DropColumnsProcessorConfig and
  SchemaTransformProcessorConfig so agents see the required field
  without reading the base class
- Add base config file path to agent context output
- Optimize agent context formatting: strip redundant path prefixes,
  remove family count summary, separate usable/unusable model aliases,
  rename sections for clarity

- Remove bare name: str redeclarations in processor configs that
  silently dropped the parent Field(description=...)
- Use Path.as_posix() in _get_source_file for consistent forward slashes

…ited Attributes

- Add (required) to all required parameters in Attributes sections
- Add Inherited Attributes section to all config subclasses listing
  fields from parent classes (SingleColumnConfig, ProcessorConfig, Constraint)
- Fix stale with_trace descriptions in LLM subclass inherited sections
- Remove discriminator fields from Attributes sections
- Remove redundant name: str redeclaration from ExpressionColumnConfig

- Show per-alias reason for unusable models instead of blanket
  "missing API keys" label
- Surface model_config_present: tell agent when no config file exists
- Fix test fixtures to use realistic data_designer/config/ paths that
  exercise _strip_config_prefix

Move `name (required)` to the top of the Inherited Attributes section
in LLMCodeColumnConfig, LLMStructuredColumnConfig, and LLMJudgeColumnConfig
so required fields appear before optional ones.

- Use {config_root}/file.py path syntax across all agent output
- Add config_root preamble to standalone `agent types` output
- Replace type_name (discriminator) with type (class name) in tables
- Show only usable model aliases; warn agent to surface config issues
- Add directive scoping agents to the config module only
- Reword import hint and config module description for directness

_get_source_file() returned "" for types outside the data_designer
package (e.g., plugin configs). Now returns the absolute path so
the agent still gets a readable file reference.

main() calls ensure_cli_default_model_settings() before any agent
command, so model config is always seeded. The model_config_present=False
branch was dead code.

Covers the remaining branch in _format_model_aliases_context where
all aliases are unusable and the agent gets a warning to surface to
the user.

Address two Greptile review comments:
- Add "inherited attributes:" to _SECTION_HEADERS so docstring parsing
  stops before that section even without a preceding blank line.
- Use .as_posix() in get_config_module_path() for consistent
  forward-slash paths across platforms.