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/corpus/hook_blocks.txt

@@ -0,0 +1,219 @@
+================================================================================
+BeforeEach hook
+================================================================================
+
+BeforeEach
+  setup_environment
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+BeforeEach with label
+================================================================================
+
+BeforeEach "setup database"
+  init_database
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (string
+          (string_content))))
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+AfterEach hook
+================================================================================
+
+AfterEach
+  cleanup_environment
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+AfterEach with label
+================================================================================
+
+AfterEach "cleanup database"
+  cleanup_database
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (string
+          (string_content))))
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+BeforeAll hook
+================================================================================
+
+BeforeAll
+  global_setup
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+BeforeAll with raw string label
+================================================================================
+
+BeforeAll 'global setup'
+  global_setup
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (raw_string)))
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+AfterAll hook
+================================================================================
+
+AfterAll
+  global_cleanup
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+BeforeCall hook
+================================================================================
+
+BeforeCall
+  prepare_call
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+AfterCall hook
+================================================================================
+
+AfterCall
+  verify_call
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+BeforeRun hook
+================================================================================
+
+BeforeRun
+  prepare_run
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+AfterRun hook
+================================================================================
+
+AfterRun
+  verify_run
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (word)))))
+
+================================================================================
+Hook with multiple statements
+================================================================================
+
+BeforeEach "complex setup"
+  export TEST_VAR="value"
+  mkdir -p /tmp/test
+  touch /tmp/test/file
+End
+
+--------------------------------------------------------------------------------
+
+(program
+  (shellspec_hook_block
+    (command
+      name: (command_name
+        (string
+          (string_content))))
+    (declaration_command
+      (variable_assignment
+        name: (variable_name)
+        value: (string
+          (string_content))))
+    (command
+      name: (command_name
+        (word))
+      argument: (word)
+      argument: (word))
+    (command
+      name: (command_name
+        (word))
+      argument: (word))))