Add comprehensive tool coverage for Serena MCP tests across all languages

[Copilot]

The Serena test suite only tested 2 of 23 available MCP tools. Extended coverage to test all tools across all supported languages (Go, Java, JavaScript, Python).

Changes

test_serena.sh

• Added test_tool_for_language() helper for consistent MCP protocol testing
• Added 22 test cases covering:
  • File operations: list_dir, find_file, search_for_pattern
  • Symbol operations: find_referencing_symbols, replace_symbol_body, insert_after_symbol, insert_before_symbol, rename_symbol
  • Memory: write_memory, read_memory, list_memories, edit_memory, delete_memory
  • Configuration: activate_project, get_current_config
  • Onboarding: check_onboarding_performed, onboarding
  • Thinking: think_about_collected_information, think_about_task_adherence, think_about_whether_you_are_done
  • Instructions: initial_instructions
• Language-specific tools (11 tools) tested for all 4 languages; others tested language-independently
• Test count: 13 → 35

README.md

• Updated tool categorization and response file documentation

Example

Helper function generates proper MCP JSON-RPC requests:

test_tool_for_language "Go" "list_dir" \
  ',"arguments":{"relative_path":"go_project"}' \
  "go_project" 1001 "Go_list_dir_response.json"

Generates:

{"jsonrpc":"2.0","id":1001,"method":"tools/call",
 "params":{"name":"list_dir","arguments":{"relative_path":"go_project"}}}

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