feat(examples): postgres-backed MCP server with filesystem authorization #1950

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	16s
checks / test (3.10, lowest-direct, windows-latest)	2m 57s
checks / test (3.11, lowest-direct, ubuntu-latest)	53s
checks / test (3.10, locked, windows-latest)	2m 31s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, windows-latest)	2m 50s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 29s
checks / test (3.12, locked, windows-latest)	3m 44s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, locked, windows-latest)	2m 17s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.13, lowest-direct, windows-latest)	2m 38s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
checks / test (3.14, locked, windows-latest)	3m 15s
checks / test (3.13, locked, ubuntu-latest)	50s
all-green	3s
	39m 59s

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