Turn the PLAIN verification exchange into a full account login:
- Advertise the mechanism list to the uplink as `saslmechlist` network
metadata, so clients see `sasl=PLAIN` in CAP LS (SASL 3.2).
- On a valid response set the client's `accountname` metadata (drives
RPL_LOGGEDIN 900) before reporting success (D S, drives 903); a bad
credential or unknown mechanism reports failure (D F, drives 904).
- Reassemble the base64 response from the uplink's 400-byte AUTHENTICATE
chunks, ending on a short chunk or a lone "+", with an upper bound to
cap a pre-auth client's buffer.
- Log the user in on NickServ REGISTER and IDENTIFY too, through the same
accountname metadata, and return the canonical account name from the
store so the login keeps its registered casing.
Verified against irctest server_tests/sasl.py (PLAIN success/failure,
non-ASCII, no-authzid, chunked payloads, unknown mechanism, too-long,
retry) on InspIRCd + fedserv.
Accounts are an append-only JSONL event log (state is the fold of the log) with
argon2id-hashed passwords. NickServ gains REGISTER <password> [email] and
IDENTIFY <password>; the engine tracks UID->nick from the burst so a command
resolves to the sender's current nick. Classic and ircd-agnostic — the cap-based
account-registration forward is the next step.
Protocol-agnostic core: a Protocol trait maps raw server-to-server lines to a
normalized event/action model, so the engine never touches a raw line and a new
ircd is one new module. Adds event-log state (state is a fold over the log) and
a service framework. First protocol impl links to an InspIRCd (insp4) uplink —
completes the CAPAB/SERVER handshake, bursts, and introduces NickServ.
