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/16.text_directive_spec.sh

@@ -1,93 +1,93 @@
-#shellcheck shell=sh disable=SC2016
+# shellcheck shell=sh disable=SC2016
 
 # %text directive is easy way to output text like here document.
 # Removes `#|` from the beginning of the each line in the %text directive,
 # the rest is the output text.
 
 Describe '%text directive'
-  It 'outputs texts'
-    output() {
-      echo "start" # you can write code here
-      %text
-      #|aaa
-      #|bbb
-      #|ccc
-      echo "end" # you can write code here
-    }
-    When call output
-    The line 1 of output should eq 'start'
-    The line 2 of output should eq 'aaa'
-    The line 3 of output should eq 'bbb'
-    The line 4 of output should eq "ccc"
-    The line 5 of output should eq 'end'
-  End
-
-  It 'sets to variable'
-    output() {
-      texts=$(
-        %text
-        #|aaa
-        #|bbb
-        #|ccc
-      )
-      echo "$texts"
-    }
-    When call output
-    The line 1 of output should eq 'aaa'
-    The line 2 of output should eq 'bbb'
-    The line 3 of output should eq "ccc"
-  End
-
-  It 'outputs texts with filter'
-    output() {
-      %text | tr 'a-z_' 'A-Z_'
-      #|abc
-    }
-    When call output
-    The output should eq 'ABC'
-  End
-
-  Describe 'variable expantion'
-    Before 'text=abc'
-
-    Example 'not expand variable (default)'
-      output() {
-        %text:raw
-        #|$text
-      }
-      When call output
-      The output should eq '$text'
-    End
-
-    Example 'expand variable'
-      output() {
-        %text:expand
-        #|$text
-      }
-      When call output
-      The output should eq 'abc'
-    End
-  End
-
-  It 'outputs texts with more complex code'
-    output() {
-      if true; then
-        set -- 1 2 3 4 5
-        while [ $# -gt 0 ]; do
-          %text:expand | tr 'a-z_' 'A-Z_'
-          #|value $(($1 * 10))
-          shift
-        done
-      else
-        %text
-        #|text
-      fi
-    }
-    When call output
-    The line 1 of output should eq 'VALUE 10'
-    The line 2 of output should eq 'VALUE 20'
-    The line 3 of output should eq 'VALUE 30'
-    The line 4 of output should eq "VALUE 40"
-    The line 5 of output should eq 'VALUE 50'
-  End
+It 'outputs texts'
+output() {
+  echo "start" # you can write code here
+  %text
+  #|aaa
+  #|bbb
+  #|ccc
+  echo "end" # you can write code here
+}
+When call output
+The line 1 of output should eq 'start'
+The line 2 of output should eq 'aaa'
+The line 3 of output should eq 'bbb'
+The line 4 of output should eq "ccc"
+The line 5 of output should eq 'end'
+End
+
+It 'sets to variable'
+output() {
+  texts=$(
+    %text
+    #|aaa
+    #|bbb
+    #|ccc
+  )
+  echo "$texts"
+}
+When call output
+The line 1 of output should eq 'aaa'
+The line 2 of output should eq 'bbb'
+The line 3 of output should eq "ccc"
+End
+
+It 'outputs texts with filter'
+output() {
+  %text | tr 'a-z_' 'A-Z_'
+  #|abc
+}
+When call output
+The output should eq 'ABC'
+End
+
+Describe 'variable expansion'
+Before 'text=abc'
+
+Example 'not expand variable (default)'
+output() {
+  %text:raw
+  #|$text
+}
+When call output
+The output should eq '$text'
+End
+
+Example 'expand variable'
+output() {
+  %text:expand
+  #|$text
+}
+When call output
+The output should eq 'abc'
+End
+End
+
+It 'outputs texts with more complex code'
+output() {
+  if true; then
+    set -- 1 2 3 4 5
+    while [ $# -gt 0 ]; do
+      %text:expand | tr 'a-z_' 'A-Z_'
+      #|value $(($1 * 10))
+      shift
+    done
+  else
+    %text
+    #|text
+  fi
+}
+When call output
+The line 1 of output should eq 'VALUE 10'
+The line 2 of output should eq 'VALUE 20'
+The line 3 of output should eq 'VALUE 30'
+The line 4 of output should eq "VALUE 40"
+The line 5 of output should eq 'VALUE 50'
+End
 End