feat(config): auto-load GITHUB_TOKEN and add obscura skill source

dot_config/fish/conf.d/10-env.fish

@@ -28,6 +28,14 @@ set -gx ANDROID_SDK_ROOT $ANDROID_HOME
 # Git hosts (non-secret; tokens are in secrets.fish)
 set -gx GITEA_LOGIN prad.codes
 set -gx GITLAB_HOST git.sonr.org
+
+# GITHUB_TOKEN from gh's keyring login — never stored on disk. An inherited
+# value wins, so nested shells skip the gh call.
+if not set -q GITHUB_TOKEN; and command -q gh
+    set -l _gh_token (gh auth token 2>/dev/null)
+    test -n "$_gh_token"; and set -gx GITHUB_TOKEN $_gh_token
+end
+
 set -gx EDITOR nvim
 set -gx VISUAL nvim