refactor: `McpError` renamed to `MCPError` and flatten parameters #374

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	30s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 36s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.14, locked, windows-latest)	3m 7s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.13, locked, windows-latest)	2m 24s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.12, locked, windows-latest)	3m 21s
checks / test (3.14, lowest-direct, windows-latest)	2m 27s
checks / test (3.11, locked, windows-latest)	2m 19s
all-green	2s
	37m 52s

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