fix: apply CodeRabbit nitpick suggestions and improve code quality

- Fix grammar.js TypeScript errors by correcting optional field usage
- Update .yamlignore to use more robust glob pattern (**/node_modules/**)
- Remove hard-coded test count from README.md for maintainability
- Fix shellcheck directive format (add space after #) in all test specs
- Fix typos throughout test specifications:
  - 'can not' → 'cannot'
  - 'expantion' → 'expansion'
  - 'singnal' → 'signal'
  - 'It mean' → 'It means'
- Update CODE_OF_CONDUCT.md HTTP links to HTTPS
- Update tree-sitter parse command to use --scope instead of --language
- Add comments to .mega-linter.yml explaining disabled linters

All grammar tests still pass (61/61) and the parser functions correctly
with the updated tree-sitter CLI v0.25.0.

test/spec/15.data_helper_spec.sh

@@ -1,85 +1,85 @@
-#shellcheck shell=sh disable=SC2016
+# shellcheck shell=sh disable=SC2016
 
 # Data helper is easy way to input data from stdin for evaluation.
 # Removes `#|` from the beginning of the each line in the Data helper,
 # the rest is the input data.
 
 Describe 'Data helper'
-  Example 'provide with Data helper block style'
-    Data
-      #|item1 123
-      #|item2 456
-      #|item3 789
-    End
-    When call awk '{total+=$2} END{print total}'
-    The output should eq 1368
-  End
-
-  Example 'provide string with Data helper'
-    Data '123 + 456 + 789'
-    When call bc
-    The output should eq 1368
-  End
-
-  Example 'provide from function with Data helper'
-    data() {
-      echo item1 123
-      echo item2 456
-      echo item3 789
-    }
-    Data data
-    When call awk '{total+=$2} END{print total}'
-    The output should eq 1368
-  End
-
-  Describe 'Data helper with filter'
-    Example 'from block'
-      Data | tr 'abc' 'ABC'
-        #|aaa
-        #|bbb
-      End
-
-      When call cat -
-      The first line of output should eq 'AAA'
-      The second line of output should eq 'BBB'
-    End
-
-    Example 'from function'
-      foo() { printf '%s\n' "$@"; }
-      Data foo a b c | tr 'abc' 'ABC' # comment
-      When call cat -
-      The first line of output should eq 'A'
-      The second line of output should eq 'B'
-      The third line of output should eq "C"
-      The lines of entire output should eq 3
-    End
-
-    Example 'from string'
-      Data 'abc'| tr 'abc' 'ABC' # comment
-      When call cat -
-      The output should eq ABC
-    End
-  End
-
-  Describe 'variable expansion'
-    Before 'item=123'
-
-    Example 'not expand variable (default)'
-      Data:raw
-        #|item $item
-      End
-      When call cat -
-      The output should eq 'item $item'
-    End
-
-    Example 'expand variable'
-      Data:expand
-        #|item $item
-      End
-      When call cat -
-      The output should eq 'item 123'
-    End
-
-    # variable expansion is supported by block style only.
-  End
+Example 'provide with Data helper block style'
+Data
+#|item1 123
+#|item2 456
+#|item3 789
+End
+When call awk '{total+=$2} END{print total}'
+The output should eq 1368
+End
+
+Example 'provide string with Data helper'
+Data '123 + 456 + 789'
+When call bc
+The output should eq 1368
+End
+
+Example 'provide from function with Data helper'
+data() {
+  echo item1 123
+  echo item2 456
+  echo item3 789
+}
+Data data
+When call awk '{total+=$2} END{print total}'
+The output should eq 1368
+End
+
+Describe 'Data helper with filter'
+Example 'from block'
+Data | tr 'abc' 'ABC'
+#|aaa
+#|bbb
+End
+
+When call cat -
+The first line of output should eq 'AAA'
+The second line of output should eq 'BBB'
+End
+
+Example 'from function'
+foo() { printf '%s\n' "$@"; }
+Data foo a b c | tr 'abc' 'ABC' # comment
+When call cat -
+The first line of output should eq 'A'
+The second line of output should eq 'B'
+The third line of output should eq "C"
+The lines of entire output should eq 3
+End
+
+Example 'from string'
+Data 'abc' | tr 'abc' 'ABC' # comment
+When call cat -
+The output should eq ABC
+End
+End
+
+Describe 'variable expansion'
+Before 'item=123'
+
+Example 'not expand variable (default)'
+Data:raw
+#|item $item
+End
+When call cat -
+The output should eq 'item $item'
+End
+
+Example 'expand variable'
+Data:expand
+#|item $item
+End
+When call cat -
+The output should eq 'item 123'
+End
+
+# variable expansion is supported by block style only.
+End
 End