Fix CLAUDE.md documentation based on maintainer feedback

Address maintainer review comments on PR ra3xdh#1497:

1. Correct qucs2spice description - it's for library model format
   conversion, not general schematic-to-netlist conversion
2. Fix qucsator_rf description - it's a real RF simulator submodule,
   not an empty placeholder
3. Move flex/bison from required to optional dependencies (only needed
   for QucsatorRF)
4. Remove Q3ScrollView statement as it's deprecated

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: robtaylor

CLAUDE.md

@@ -39,9 +39,9 @@ make install
 Both options can be enabled simultaneously. Priority order: shared library → external process.
 
 ### Dependencies
-- **Required**: Qt6 (Core, Gui, Widgets, Svg, SvgWidgets, Xml, PrintSupport, Charts), CMake, flex, bison, gperf, dos2unix, C++20 compiler
+- **Required**: Qt6 (Core, Gui, Widgets, Svg, SvgWidgets, Xml, PrintSupport, Charts), CMake, gperf, dos2unix, C++20 compiler
 - **Runtime**: ngspice (primary simulation kernel, or libngspice if using shared library mode)
-- **Optional**: libngspice (for WITH_NGSPICE_SHARED)
+- **Optional**: libngspice (for WITH_NGSPICE_SHARED), flex/bison (only for QucsatorRF submodule)
 
 ### Running
 ```bash
@@ -85,7 +85,7 @@ Components inherit from base Element class
   - Emits Qt signals to integrate with existing architecture
 - **xyce.cpp/h**: Xyce simulator support
 - **spicecompat.cpp/h**: SPICE compatibility layer
-- **qucs2spice.cpp/h**: Qucs schematic to SPICE netlist converter
+- **qucs2spice.cpp/h**: Library model format converter (converts Qucs-format models to SPICE format for library components)
 
 ### Visualization (`qucs/diagrams/`)
 - **diagram.cpp/h**: Base diagram/graph classes
@@ -196,13 +196,13 @@ Configuration in `.clangd` file.
 
 ### Simulation Flow
 1. User creates schematic in GUI
-2. Schematic converted to SPICE netlist (via `qucs2spice`)
-3. Netlist sent to simulation kernel (typically ngspice)
+2. Schematic components generate SPICE netlist
+3. Netlist sent to simulation kernel (typically ngspice via shared library or external process)
 4. Results parsed and visualized in diagrams
 
 ### Submodules
-- `qucsator_rf/` is a git submodule (currently empty placeholder)
-- Must run `git submodule init && git submodule update` after clone
+- `qucsator_rf/` is a git submodule containing the RF circuit simulator
+- Must run `git submodule init && git submodule update` after clone to populate it
 
 ## Common Tasks
 
@@ -215,11 +215,11 @@ Configuration in `.clangd` file.
 ### Debugging Build Issues
 - Check component library files in `library/` are installed
 - Verify Qt6 development packages present
-- Ensure flex/bison/gperf available for parser generation
+- Ensure gperf is available
 - Review CMake output for missing dependencies
 
 ### Working with Schematic Editor
-Key interaction code in `mouseactions.cpp` and `schematic.cpp`. Canvas uses custom Qt3-compatibility scroll view (`Q3ScrollView`).
+Key interaction code in `mouseactions.cpp` and `schematic.cpp`.
 
 ### Translation Updates
 Run with `-DUPDATE_TRANSLATIONS=ON` to update `.ts` translation files from source.