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/07.before_after_hook_spec.sh

@@ -0,0 +1,77 @@
+#shellcheck shell=sh
+
+# shellspec has Before and After hook.
+# Those hooks are execute for each example (It/Example/Specify).
+# There is no hooks execute for each example group (Describe/Context).
+# In other words, There is no BeforeAll / AfterAll hooks. It is design policy.
+
+Describe 'before / after hook example'
+  Describe '1: before hook'
+    setup() { value=10; }
+    Before 'setup'
+
+    add_value() {
+      value=$((value + $1))
+      echo "$value"
+    }
+
+    It 'is called before execute example'
+      When call add_value 10
+      The output should eq 20
+    End
+
+    It 'is called for each example'
+      When call add_value 100
+      The output should eq 110
+    End
+  End
+
+  Describe '2: before hook'
+    setup1() { value1=10; }
+    setup2() { value2=20; }
+    Before 'setup1' 'setup2'
+
+    add_values() {
+      echo "$((value1 + value2))"
+    }
+
+    It 'can register multiple'
+      When call add_values
+      The output should eq 30
+    End
+  End
+
+  Describe '3: before hook'
+    Before 'value=10'
+
+    echo_value() { echo "$value"; }
+
+    It 'can also specify code instead of function'
+      When call echo_value
+      The output should eq 10
+    End
+  End
+
+  Describe '4: before hook'
+    setup() { false; } # setup fails
+    Before 'setup'
+    echo_ok() { echo ok; }
+
+    It 'is fails because before hook fails'
+      When call echo_ok
+      The output should eq 'ok'
+    End
+
+    # This behavior can be used to verify initialization of before hook.
+  End
+
+  Describe '5: after hook'
+    cleanup() { :; } # clean up something
+    Before 'cleanup'
+
+    It 'is called after execute example'
+      When call echo ok
+      The output should eq 'ok'
+    End
+  End
+End