feat: implement complete tree-sitter-shellspec grammar with comprehensive testing

- Add full ShellSpec grammar extending tree-sitter-bash
- Support all ShellSpec constructs: Describe, Context, It, hooks, utilities
- Include Data block parsing with statements and argument styles
- Add 61 comprehensive test cases covering real-world patterns
- Implement optimized GitHub workflows with CI/CD automation
- Configure complete development tooling (linting, formatting, pre-commit)
- Add comprehensive documentation and contribution guidelines
- Optimize grammar conflicts to zero warnings
- Support editor integration for Neovim, VS Code, Emacs

Breaking Changes:
- Initial release, no previous API to break

BREAKING CHANGE: Initial implementation of tree-sitter-shellspec grammar

# Conflicts:
#	.github/workflows/codeql.yml
#	.github/workflows/pr-lint.yml
#	.pre-commit-config.yaml

# Conflicts:
#	.github/workflows/pr-lint.yml

# Conflicts:
#	.github/workflows/pr-lint.yml

test/spec/15.data_helper_spec.sh

@@ -0,0 +1,85 @@
+#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
+End