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

dot_config/fish/functions/_agents_bind.fish

@@ -0,0 +1,12 @@
+function _agents_bind --description 'ctrl-a: pick an AI agent (tv agents --inline) and start it, then redraw the prompt'
+    # The cable's launch action writes `ran` to $AGENTS_STATE before exec'ing
+    # the agent. Cancelled: tv left the cursor on the line below the prompt, so
+    # step back up; ran: the prompt goes wherever the agent left the cursor.
+    set -lx AGENTS_STATE (mktemp)
+    tv agents --inline
+    if test "$(cat $AGENTS_STATE)" != ran
+        printf '\033[A' >/dev/tty
+    end
+    rm -f $AGENTS_STATE
+    commandline -f repaint
+end