docs: address second round of review feedback

- Fix settings.local.json: clarify it's not gitignored yet, advise
  adding to .gitignore
- Fix plugin terminology: "factory functions" → "entrypoints" to match
  actual register_plugin() ABI
- Remove manual cmake build command from copilot instructions to avoid
  inconsistency with build.sh defaults

Author: wambitz

.github/copilot-instructions.md

@@ -17,11 +17,11 @@ This is a modern C++ project template using CMake >= 3.20 and C++17.
 - Tests go in `tests/test_<target_name>.cpp` using GoogleTest (GTest)
 - Use `target_include_directories` and `target_link_libraries` with correct CMake visibility keywords (PUBLIC, PRIVATE, INTERFACE)
 - Shared libraries use RPATH (`$ORIGIN/../lib`) for portable deployment
-- Plugins use a C-compatible API with `extern "C"` exported factory functions
+- Plugins use a C-compatible API with `extern "C"` exported entrypoints
 
 ## Build & Test
 
-- Build: `./scripts/build.sh` or `mkdir -p build && cd build && cmake .. && make`
+- Build: `./scripts/build.sh`
 - Test: `cd build && ctest --output-on-failure`
 - Format: `./scripts/format.sh`
 - Lint: `./scripts/lint.sh` (requires build first for compile_commands.json)

docs/ai-assistant-guide.md

@@ -59,7 +59,8 @@ or `./scripts/build.sh`. The settings file pre-approves safe commands:
 This eliminates repetitive permission prompts and makes Claude significantly
 faster to work with. Dangerous commands (`rm -rf /`, `sudo`) are explicitly denied.
 
-Personal overrides go in `.claude/settings.local.json` (gitignored).
+Personal overrides should go in `.claude/settings.local.json`; add this path
+to your `.gitignore` so local settings aren't committed.
 
 ### .claude/settings.json — Auto-Format Hook