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/05.expectation_spec.sh

@@ -0,0 +1,27 @@
+#shellcheck shell=sh
+
+Describe 'expectation example'
+  It 'is succeeds because expectation is successful'
+    foo() { echo "foo"; }
+    When call foo
+    The output should eq "foo" # this is expectation
+  End
+
+  It 'is failure because expectation is fail'
+    foo() { echo "foo"; }
+    When call foo
+    The output should eq "bar"
+  End
+
+  Example 'you can write multiple expectations'
+    foo() {
+      echo "foo"
+      value=123
+      return 1
+    }
+    When call foo
+    The output should eq "foo"
+    The value "$value" should eq 123
+    The status should eq 1
+  End
+End