GuildJoinTask.Parse() reads data[guild_status].ToInt() directly; hardcoding 2
for the APPROVAL path was wrong. GuildOpResult gains nullable GuildStatus; JoinAsync
sets 1 (APPLYING) for the pending-request path and 2 (JOINING) for instant joins.
Controller reads r.GuildStatus. Two new tests assert the wire value per path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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