comunica / comunica-feature-mcp / 35990733195

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Report errors with their causes, and without HTML error pages

Errors reached the agent either enormous or useless: the full HTML error
page of an unavailable endpoint at 12 360 characters on one side, and a
bare 'fetch failed' with no host and no reason on the other, as the
actual reason sat in the cause of the error.

Errors are now unwrapped along their cause chain, stripped of HTML error
pages and capped at 1 000 characters, so that a dead host reports:

  Query failed: fetch failed: getaddrinfo ENOTFOUND no-such-host.invalid

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XsJEtfJvQuwEneuWAKb5RH

171 of 171 branches covered (100.0%)

Branch coverage included in aggregate %.

16 of 16 new or added lines in 1 file covered. (100.0%)

304 of 304 relevant lines covered (100.0%)

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