Stop advertising MCP_* env vars for MCPServer settings; drop pydantic… #3647

Job	Run time
checks / readme-snippets	14s
checks / docs	57s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, locked, windows-latest)	1m 54s
checks / test (3.12, locked, ubuntu-latest)	1m 44s
checks / test (3.13, locked, ubuntu-latest)	1m 13s
checks / pre-commit	50s
checks / test (3.13, locked, windows-latest)	2m 3s
checks / test (3.13, lowest-direct, windows-latest)	2m 0s
checks / test (3.14, locked, windows-latest)	2m 4s
checks / test (3.14, locked, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	1m 57s
checks / test (3.10, locked, ubuntu-latest)	1m 31s
checks / test (3.11, locked, ubuntu-latest)	1m 19s
checks / test (3.10, lowest-direct, windows-latest)	1m 57s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.11, locked, windows-latest)	1m 57s
checks / test (3.11, lowest-direct, windows-latest)	1m 55s
checks / test (3.10, locked, windows-latest)	2m 5s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 17s
all-green	5s
	35m 51s

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