SRPCTransport silently drops interceptors passed to create()

[codyhartsook]

Summary

SRPCTransport.create() accepts interceptors: list[ClientCallInterceptor] but never stores or applies them. Interceptor middleware (logging, auth, tracing) is silently ignored.

Root cause

create() discards interceptors before construction:

@classmethod
def create(cls, card, url, config, interceptors):  # accepted
    channel = config.slimrpc_channel_factory(url)
    return cls(channel, card)  # dropped

Suggested fix

Mirror the upstream JsonRpcTransport pattern:

1. Accept and store interceptors in __init__
2. Forward from create() → __init__
3. Add _apply_interceptors() and call it in every method before the stub call

Affected version

slima2a 0.3.0