fix: clarify functionRootPath source directory contract

[binggg]

Summary

• clarify manageFunctions.functionRootPath as the direct cloud function source directory instead of a generic project root
• strengthen HTTP path error guidance so the model is told to pass cloudfunctions / functions, not the project root
• refresh generated tool docs and add regression checks for the stronger wording

Attribution

• issue_mnrla3c5_arb0w2
• closes Clarify manageFunctions functionRootPath should target cloudfunctions/functions dir, not project root #568

Verification

• cd mcp && npx vitest run src/tools/functions.test.ts
• node --input-type=module -e ... listTools() runtime schema check confirmed functionRootPath description now includes project-root warning
• evaluation: atomic-js-none-cloudbase-hello-function/2026-04-18T01-01-19-60f057 -> pass (5/5)

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