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/12.skip_spec.sh

@@ -0,0 +1,100 @@
+#shellcheck shell=sh
+
+Describe 'skip example'
+  Describe 'calc()'
+    calc() { echo "$(($*))"; }
+
+    It 'can add'
+      When call calc 1 + 1
+      The output should eq 2
+    End
+
+    It 'can minus'
+      When call calc 1 - 1
+      The output should eq 0
+    End
+
+    # Skip examples of after this line in current example group
+    Skip "decimal point can not be calculated"
+
+    It 'can add decimal point'
+      When call calc 1.1 + 1.1
+      The output should eq 2.2
+    End
+
+    It 'can minus decimal point'
+      When call calc 1.1 - 1.1
+      The output should eq 0
+    End
+
+    Describe 'Multiplication' # example group is also skipped
+      It 'can multiply decimal point'
+        When call calc 1.1 '*' 1.1
+        The output should eq 1.21
+      End
+    End
+  End
+
+  Describe 'status_to_singnal()'
+    status_to_singnal() {
+      if [ 128 -le "$1" ] && [ "$1" -le 192 ]; then
+        echo "$(($1 - 128))"
+      else
+        # Not implemented: echo "status is out of range" >&2
+        return 1
+      fi
+    }
+
+    It 'can not convert status to singnal'
+      When call status_to_singnal 0
+      The status should be failure
+
+      # Skip expection of after this line in current example
+      Skip 'outputs error message is not implemented'
+      The error should be present
+    End
+
+    # This example is going to execute
+    It 'converts status to singnal'
+      When call status_to_singnal 137
+      The output should eq 9
+    End
+  End
+
+  # "temporary skip" can not hidden with "--skip-message quiet" option
+  Describe 'temporary skip'
+    Example 'with Skip helper'
+      Skip # without reason
+      When call foo
+      The status should be success
+    End
+
+    xExample 'with xExample (prepend "x")'
+      When call foo
+      The status should be success
+    End
+
+    xDescribe 'with xDescribe (prepend "x")'
+      Example 'this is also skipped'
+        When call foo
+        The status should be success
+      End
+    End
+  End
+
+  Describe 'conditional skip'
+    Example 'skip1'
+      conditions() { return 0; }
+      Skip if "function returns success" conditions
+      When call echo ok
+      The stdout should eq ok
+    End
+
+    Example 'skip2'
+      conditions() { echo "skip"; }
+      Skip if 'function returns "skip"' [ "$(conditions)" = "skip" ]
+      When call echo ok
+      The stdout should eq ok
+    End
+  End
+End