feat(examples): postgres-backed MCP server with filesystem authorization #1949

Job	Run time
checks / pre-commit	19s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, windows-latest)	2m 52s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, lowest-direct, windows-latest)	2m 43s
checks / test (3.12, lowest-direct, windows-latest)	3m 59s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.12, locked, windows-latest)	3m 26s
checks / test (3.13, locked, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.14, lowest-direct, windows-latest)	2m 50s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, windows-latest)	3m 1s
checks / test (3.14, locked, ubuntu-latest)	2m 29s
checks / test (3.13, lowest-direct, windows-latest)	2m 49s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.14, locked, windows-latest)	2m 52s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.11, locked, windows-latest)	2m 10s
all-green	5s
	40m 48s

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