Harden blog API provider failures

[jynbil1]

Summary

• return generic 502 API errors when agent/API blog list calls fail upstream
• log structured upstream diagnostics for blog list and view failures without exposing provider messages
• add a shell guard to keep raw blog provider messages out of API failure paths

/claim #59

Validation

• sh -n tests/check-blog-api-provider-failures.sh
• sh tests/check-blog-api-provider-failures.sh
• git diff --check
• PHP lint not run: php is not installed in this environment

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