"unsupported did method" for did:web fails #10

in the match, there's a fall-through from the condition starting at line 801:

https://tangled.org/nonbinary.computer/jacquard/blob/main/crates/jacquard-identity/src/lib.rs#L797-808

if self.get_json_bytes(url).await fails, we don't break, resolved_doc stays None, and a confusing error message surfaces (unsupported method)