Auto-generated API doc: doxygen → custom Python emitter → doc/api/.

`cmake --build build --target doc` runs Doxygen to produce XML, then
`doc/gen_api_md.py` (~330 lines, stdlib-only) emits a Markdown tree
under `doc/api/` that gitea renders directly in its file browser.

- 24 class/struct pages + 51 source-file pages + indices, with source
  links of the form `../../../../src/...#L42` that gitea turns into
  clickable line-anchored links.
- Doxyfile.in templated by CMake (XML-only output to build/doc/xml/).
- Pure Python emitter, zero external deps — no doxybook2 (not packaged
  on Arch) and no moxygen (avoids Node).
- Target gracefully disabled if Doxygen or Python 3 is missing at
  configure time; regular build target unaffected.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

doc/api/classes/ImportBase.md

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+# ImportBase
+
+`class ImportBase`
+
+Defined in [import_base.hpp:16](../../../../src/imports/import_base.hpp#L16)
+
+Base class for importing data from a file.
+
+This class provides a foundation for parsing files and managing system parts and signals. Derived classes must implement the ``parse`` method. method.
+
+## Protected Attributes
+
+### `Parts * prts`
+
+📍 [import_base.hpp:19](../../../../src/imports/import_base.hpp#L19)
+
+Pointer to the [Parts](../classes/Parts.md) object. object.
+
+### `std::fstream file_lines`
+
+📍 [import_base.hpp:20](../../../../src/imports/import_base.hpp#L20)
+
+File stream for reading the input file.
+
+## Public Functions
+
+### `ImportBase(std::string file_name)`
+
+📍 [import_base.hpp:30](../../../../src/imports/import_base.hpp#L30)
+
+Constructor for [ImportBase](../classes/ImportBase.md)..
+
+Initializes the file stream and creates new [Parts](../classes/Parts.md) and and [Signals](../classes/Signals.md) objects. objects.
+
+**Parameters**
+
+- `file_name` — Name of the file to be imported.
+
+### `void parse(Signals *signals)=0`
+
+📍 [import_base.hpp:42](../../../../src/imports/import_base.hpp#L42)
+
+Pure virtual method for parsing the file.
+
+Derived classes must implement this method to define how the file is parsed.
+
+**Parameters**
+
+- `signals` — Pointer to the signals object to be completed.
+
+### `Parts * parts()`
+
+📍 [import_base.hpp:48](../../../../src/imports/import_base.hpp#L48)
+
+Retrieves the [Parts](../classes/Parts.md) object. object.
+
+**Returns** Pointer to the [Parts](../classes/Parts.md) object.
+
+### `~ImportBase()=default`
+
+📍 [import_base.hpp:58](../../../../src/imports/import_base.hpp#L58)
+
+Virtual destructor for [ImportBase](../classes/ImportBase.md)..
+
+Ensures proper cleanup of derived classes.
+
+---
+
+← [Back to classes](index.md) · [Top](../index.md)