feat(channel): improve support for obfuscated channels

[shiftinv]

Summary

Starting 2026-11-16, inaccessible channels will be obfuscated (when received via gw) or omitted entirely (via rest). While this doesn't have as many implications for the library as it does for bot developers, there are still a few things to add, namely:

• ChannelFlags.obfuscated, plus GuildChannel.is_obfuscated() shorthand
• Prefer the (always non-obfuscated) channel data in interactions over its equivalent cached channel object, if that one's obfuscated
• Add a little (:tm:) explainer to the FAQ that goes a little more into the details of what channel obfuscation effectively means for developers (preview)

While these won't ever be obfuscated, there's also an is_obfuscated() -> Literal[False] method on DMChannel, GroupChannel, and Thread for compatibility.

For testing purposes (well, at least for the gw part), obfuscation can be enabled for a bot in the dev portal.

discord/discord-api-docs@8466405

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running uv run nox -s lint
  • I have type-checked the code by running uv run nox -s pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[read-the-docs-community]

Documentation build overview

📚 disnake | 🛠️ Build #34315159 | 📁 Comparing 35676bb against latest (6a8247c)

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52 files changed · ± 52 modified

± Modified

• faq.html
• genindex.html
• index.html
• intents.html
• whats_new.html
• api/abc.html
• api/activities.html
• api/app_commands.html
• api/app_info.html
• api/audit_logs.html
• and 42 more...