refactor: `McpError` renamed to `MCPError` and flatten parameters #373

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	33s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.11, locked, windows-latest)	2m 53s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.12, lowest-direct, windows-latest)	4m 0s
checks / test (3.12, locked, windows-latest)	3m 38s
checks / test (3.10, locked, windows-latest)	2m 28s
checks / test (3.13, locked, windows-latest)	2m 18s
checks / test (3.14, locked, windows-latest)	3m 23s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.10, lowest-direct, windows-latest)	2m 55s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.14, lowest-direct, windows-latest)	2m 21s
all-green	2s
	40m 34s

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