refactor: extend TOML parser for nested tables, inline tables, and JSON arrays

- Add support for nested table headers ([tools.shell], [tools.file_read], etc.)
- Add support for inline tables (capabilities = { General = 1.0, Coding = 0.7 })
- Add support for JSON-style arrays (shell_allowed_executables = ["bash", "sh"])
- Maintain backward compatibility with old CSV formats (deprecated, logged as warnings)
- Refactor buildConfig() to handle new value types (Map, List, Boolean, Number)
- Update docs/sample-config.toml to use clean TOML shapes
- Add comprehensive tests for inline tables, nested sections, JSON arrays, and fallback parsing
- Remove ugly workarounds: capabilities no longer a CSV string, tool flags now in proper nested sections

docs/sample-config.toml

@@ -0,0 +1,52 @@
+# CORREX Configuration Sample
+# Place at ~/.config/correx/config.toml
+
+[server]
+host = "localhost"
+port = 8080
+
+[tui]
+theme = "dark"
+session_list_limit = 5
+
+[cli]
+default_output = "human"
+
+[approval]
+timeout_ms = 300000
+
+[tools]
+sandbox_root = "~/.config/correx/sandbox"
+working_dir = "/tmp"
+default_system_prompt_path = "~/.config/correx/prompts/default_system.md"
+
+[tools.shell]
+enabled = true
+allowed_executables = ["bash", "sh", "python3", "node"]
+
+[tools.file_read]
+enabled = true
+
+[tools.file_write]
+enabled = true
+
+[tools.file_edit]
+enabled = true
+
+# Provider configuration (array of tables)
+[[providers]]
+id = "local-llama"
+type = "llamacpp"
+model_id = "mistral-7b"
+model_path = "~/models/mistral-7b-gguf/model.gguf"
+url = "http://127.0.0.1:10000"
+capabilities = { General = 1.0, Coding = 0.7, Reasoning = 0.6, Summarization = 0.8, ToolCalling = 0.5 }
+
+# Example: second provider (if you have multiple)
+# [[providers]]
+# id = "alternative-llama"
+# type = "llamacpp"
+# model_id = "neural-chat-7b"
+# model_path = "~/models/neural-chat-7b-gguf/model.gguf"
+# url = "http://127.0.0.1:10001"
+# capabilities = { General = 0.9, Coding = 0.8, Reasoning = 0.7, Summarization = 0.75, ToolCalling = 0.6 }