RPC failures logged only the top-level anyhow context, so a peer-files
failure produced exactly "RPC error on content.browse-peer: Failed to
connect to peer" with the real cause discarded. That made it impossible
to tell a dead peer from a slow Tor circuit from a FIPS resolve failure
without reproducing by hand.
Switch the log line to `{:#}` so the whole context chain is rendered.
The client-facing message still uses `{}` through sanitize_error_message,
so no internal detail is leaked to callers.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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