Extends the SyncProvider interface with an optional pushRoute method
plus PushRoutePayload, PushRouteResult, and a typed PushError so the
slice-4 action route can map error codes to user-facing copy without
parsing HTTP statuses itself.
Wahoo provider:
- adds routes_write to the requested OAuth scope set
- implements pushRoute: base64-encodes the FIT, builds the form body
Wahoo's POST /v1/routes expects, parses the remote id out of the
response, and throws typed PushError on 401/403/422/429/5xx
- saveConnection now persists the requested scopes as grantedScopes
on exchangeCode (Wahoo doesn't return a scope field, so the
requested set is the granted set)
Token refresh on 401 is deferred to the slice-4 action route — same
pattern as the existing webhook handler in this repo, which does
inline refresh rather than wrapping every call.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>