feat(runtime): share chat commands and run login sequence

docs/plans/2026-08-14-launcher-campaign.md

@@ -168,13 +168,21 @@ line, writer opens `FileShare.Read`, tailer opens
 `Read/FileShare.ReadWrite|Delete`): events `started`, `connected`,
 `characterList{accountName,slotCount,characters[{id,name,secondsGreyedOut}]}`,
 `enteredWorld{characterId,characterName}`, `pluginLoaded{plugin}`,
-`pluginFailed{plugin,error}`, `disconnected{reason}`,
+`pluginFailed{plugin,error}`,
+`loginCommandFailed{commandIndex,command,error}`,
+`disconnected{reason}`,
 `exited{code,reason}` — every line carries `"v":1`, `"e"`, `"t"`
 (ISO-8601 UTC), `"sessionId"`. `secondsGreyedOut` is a uint on BOTH
 sides. Unknown `e` values must parse to a typed Unknown event, never
 throw; a known `e` with a wrong payload shape should be distinguishable
 from an unknown `e` (LA3 review finding 12).
 
+`loginCommandFailed.commandIndex` is the zero-based index in the configured
+`loginCommands` array. `command` is the exact configured line and `error` is
+the isolated parser/router/handler failure. The event is observational: the
+host continues with the next configured line and never converts the command
+failure into a login, plugin, session, or process failure.
+
 **Known LA1 status limitation:** the stream has no independent mid-play
 wire-drop detector. If a transport becomes silent without raising through the
 host's tick/teardown path, no immediate `disconnected` line can be promised;
@@ -203,9 +211,10 @@ Three pieces, one slice, because they share the session-config/status seam:
    `RuntimeOptions.LivePass` is a bare string — the config path must not
    widen that exposure).
 2. **Status stream both hosts:** per-session `status.jsonl` (path given in
-   config; absent → no writer constructed, zero cost). Versioned event
+   config; absent → permanent no-op sink). Versioned event
    vocabulary (`"v":1`): `started`, `connected`, `characterList`,
-   `enteredWorld`, `pluginLoaded`/`pluginFailed`, `disconnected`, `exited`.
+   `enteredWorld`, `pluginLoaded`/`pluginFailed`,
+   `loginCommandFailed`, `disconnected`, `exited`.
    Recon: today's `HeadlessDiagnosticWriter` is a single shared-stdout JSONL
    sink with four kinds (lifecycle/failure/event/resources) and NO per-session
    file — the status writer is a second, separate sink, not a rework of the