chore: fix plan doc type reference, gitignore superpowers dir

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: thetillhoff

.gitignore

@@ -5,3 +5,4 @@ cmd/server/server
 
 test/config.yaml
 test/*/*.mkv
+.superpowers/

TODO.md

@@ -0,0 +1,23 @@
+# TODO
+
+## Bump livekit/sipgo to pick up IPv6 Via header fix
+
+The `go.mod` currently pins:
+
+```text
+github.com/livekit/sipgo v0.13.2-0.20260519205735-a5b4a38b6ceb
+```
+
+That pseudoversion points to a commit on livekit/sipgo's `fork` branch. A new PR has
+been merged into that `fork` branch adding IPv6 Via header parsing support (bumps the
+underlying `emiago/sipgo` from `v0.24.1` to `v1.4.0`).
+
+Steps:
+
+- Find the latest commit hash on livekit/sipgo's `fork` branch:
+  `git ls-remote https://github.com/livekit/sipgo.git fork`
+- Update `go.mod` to point to that commit:
+  `go get github.com/livekit/sipgo@<new-commit-sha>` then `go mod tidy`
+- Fix any compilation errors from the updated sipgo API (`go build ./...`)
+- Verify the `emiago/sipgo` indirect dep in `go.mod` is at `v1.4.0` or later
+- Commit on branch `feat/ipv6-support` referencing the sipgo bump

docs/superpowers/plans/2026-06-29-opus-codec-support.md

@@ -259,7 +259,7 @@ unit tests — without adding any YAGNI abstractions.
 
    m := &livekit.SIPMediaConfig{
     OnlyListedCodecs: true,
-    Codecs: []*livekit.SIPCodecOptions{
+    Codecs: []*livekit.SIPCodec{
      {Name: "opus", Rate: 48000},
     },
    }