[Suggestion] Migrate Discord library from Kord to JDA + jda-ktx

[Wikijito7]

Is your feature request related to a problem? Please describe.
Kord is effectively unmaintained — its DAVE (Discord E2EE voice) support lives only in a custom SNAPSHOT fork. Since Discord requires DAVE for all voice connections since March 2026, we're stuck maintaining a custom fork with 13 local JARs and manual transitive dependencies. This is fragile and unsustainable.

Describe the solution you'd like
Migrate to JDA v6.4.2 + jda-ktx (Kotlin coroutine extensions). Research done in #opencode confirms this is the most viable path:

• Active: JDA released v6.4.2 in June 2026 (180+ contributors)
• Coroutine-native: jda-ktx provides CoroutineEventManager + .await() extensions — minimal paradigm shift from Kord
• DAVE ready: Supports the same libdave-jvm library we already depend on
• Simpler deps: No local JARs, no manual transitive tracking — just Maven Central

We already use libdave-jvm (0.1.2/0.1.3) via JNI, which JDA also supports through its AudioModuleConfig API.

Describe alternatives you've considered

1. Discord4J v3.3.2 — Also DAVE-ready and maintained, but uses Reactor (Mono/Flux), a reactive paradigm that would require rewriting every interaction handler. Bigger paradigm shift from our coroutine-heavy codebase.
2. Staying on Kord — Requires maintaining the SNAPSHOT fork ourselves. Not sustainable long-term.
3. Javacord — Less feature-rich, no DAVE support confirmed.

Migration scope (estimated ~17-19 days full-time)

Layer	Effort	Notes
Dependencies	1d	Add JDA/jda-ktx, remove 13 local JARs, update Koin DI
Bot core	2d	Rewrite Bot.kt (client init, event wiring, presence)
Commands (13)	4-5d	Rewrite all command files + CommandHandlerService
Voice (GuildLavaPlayerService)	3d	Swap Kord's audioProvider lambda → JDA's AudioSendHandler + DAVE config
Components/Embeds	2d	Rewrite PlayerCommons, PaginatedEmbedUtils, component builders
Error handling	1d	Adapt ErrorHandlerService types
Tests (16 files)	3-4d	Rewrite DiscordMocks, adapt all Kord mocks to JDA
Cleanup	1d	Remove libs/ JARs, old deps, ktlint, verify

Key changes per layer:

• Voice: voiceChannel.connect { audioProvider { ... } } → guild.audioManager.sendingHandler = LavaPlayerSendHandler { ... } + AudioModuleConfig.withDaveSessionFactory(JDaveSessionFactory())
• Events: bot.on<XEvent> { } → jda.listener<XEvent> { } (coroutine-friendly via jda-ktx)
• Commands: GlobalMultiApplicationCommandBuilder → jda.updateCommands { slash("name", "desc") { } }
• Responses: response.respond { content = "..." } → event.reply("...").await()
• Components: ActionRowBuilder + interactionButton(...) → row(secondary(id) { }) (jda-ktx DSL)
• Embeds: embed { ... } → Embed(title = "...") { field { } } (jda-ktx)

The business logic (Lavaplayer, queue management, TTS, radio, localization) stays largely intact.

Additional context
Full research and API mapping available in the opencode session logs. See also:

• JDA: https://github.com/discord-jda/JDA
• jda-ktx: https://github.com/MinnDevelopment/jda-ktx
• DAVE protocol: https://daveprotocol.com/
• libdave-jvm (already used): https://github.com/KyokoBot/libdave-jvm