Format KW macro keyword invocations onto separate lines in reserved_keywords unit test

[Copilot]

The KW macro in tests/unit/reserved_keywords.cpp had multiple X(...) invocations compressed onto one line, which made the keyword list harder to scan and debug. This updates the definition to use one invocation per line, matching the surrounding style.

• Macro formatting consistency

  • Expanded the final grouped sequence in KW(X) so each keyword uses its own continued line.
  • No semantic or behavioral changes; this is a readability/maintainability refactor in test code.

• Updated section

  • Reformatted:
    • X(override) X(priv) X(unsized) X(yield) X(macro_rules) X(raw) X(safe) X(vec)
  • Into:

X(override)                                                                  \
X(priv)                                                                      \
X(unsized)                                                                   \
X(yield)                                                                     \
X(macro_rules)                                                               \
X(raw)                                                                       \
X(safe)                                                                      \
X(vec)

Original prompt

Please apply the following diffs and create a pull request.
Once the PR is ready, give it a title based on the messages of the fixes being applied.

[{"message":"Multiple macro invocations on a single line reduces readability and makes debugging more difficult. Consider placing each X() invocation on a separate line for consistency with the rest of the KW macro definition.","fixFiles":[{"filePath":"tests/unit/reserved_keywords.cpp","diff":"diff --git a/tests/unit/reserved_keywords.cpp b/tests/unit/reserved_keywords.cpp\n--- a/tests/unit/reserved_keywords.cpp\n+++ b/tests/unit/reserved_keywords.cpp\n@@ -33,7 +33,14 @@\n   X(final)                                                                     \\\n   X(gen)                                                                       \\\n   X(macro)                                                                     \\\n-  X(override) X(priv) X(unsized) X(yield) X(macro_rules) X(raw) X(safe) X(vec)\n+  X(override)                                                                  \\\n+  X(priv)                                                                      \\\n+  X(unsized)                                                                   \\\n+  X(yield)                                                                     \\\n+  X(macro_rules)                                                               \\\n+  X(raw)                                                                       \\\n+  X(safe)                                                                      \\\n+  X(vec)\n \n // Field declaration\n #define F(n) int n;\n"}]}]