post
https://example.com/profiles/investor//account/bind
Caller supplies an external network account they own, optionally with an
ownershipSignature hint. Proof-of-ownership is enforced by the ledger adapter
according to its own policy — typically a challenge (e.g. signatureTemplate)
the caller must fulfil, an out-of-band approval, or the adapter's own upfront
verification. Async: returns 202 { cid }. If the
wallet is already bound to another investor — or to the same investor on the same
(org, asset) — completion reports WALLET_ALREADY_BOUND (409). A bad signature
reports WALLET_BAD_SIGNATURE (400).
