docs: add keyboard quick-reference to READMEs

ober

996405617f5d5acb20638f0d8979452410d39fb2

diff --git a/README.md b/README.md
index dc1d72f..a262775 100644
--- a/README.md
+++ b/README.md
@@ -17,9 +17,27 @@ the source of truth; Qt is only a display + input surface.
 jerboa-browser https://example.com    # opens the window, keyboard-driven
 ```
 
+## Quick keys (TL;DR)
+
+No address bar — Jerboa is keyboard-driven (`C-` = Ctrl, `M-` = Alt; `C-h b`
+lists every binding):
+
+| Key | Does |
+|-----|------|
+| `C-l` | **open a URL** — type in the prompt, press Enter |
+| `M-l` | open a URL in a new buffer (tab) |
+| `C-t` / `C-x C-k` | new buffer (tab) / close current |
+| `M-n` / `M-p` | next / previous buffer |
+| `C-r` · `C-b` / `C-f` | reload · history back / forward |
+| `C-s` · `f` | find on page · follow a link by hint |
+| `M-x` · `C-h b` | run a command by name · list all keys |
+| `C-x C-c` | quit |
+
 ## Keyboard (emacs keyscheme)
 
-The minibuffer line doubles as the echo area; the status line shows
+There is no address bar: `C-l` opens a URL prompt in the minibuffer — type the
+URL (scheme optional; bare hosts become `https://…`) and press Enter, or `C-g`
+to cancel. The minibuffer line doubles as the echo area; the status line shows
 `[modes] [i/n] title — url`. `C-g` aborts a half-typed chord, a prompt, or
 hint-mode. `C-h b` opens a buffer listing every binding.
 
diff --git a/packaging/linux/build-tarball.sh b/packaging/linux/build-tarball.sh
index 884cbdd..4eb01ec 100755
--- a/packaging/linux/build-tarball.sh
+++ b/packaging/linux/build-tarball.sh
@@ -109,6 +109,21 @@ Run it:
   ./bin/jerboa-browser repl            Jerboa REPL with (browser) preloaded
   headless smoke (no window): QT_QPA_PLATFORM=offscreen JWB_BROWSE_MS=1500 ./bin/jerboa-browser example.com
 
+Keys (Emacs-style: C-=Ctrl, M-=Alt; a space is a chord, e.g. C-x b is
+      C-x then b. C-g aborts anything.):
+  C-l          open a URL  (there's no address bar — type in the prompt, Enter)
+  M-l          open a URL in a new buffer (tab)
+  C-t          new buffer (tab)
+  C-x C-k      close current buffer
+  M-n / M-p    next / previous buffer
+  C-r          reload
+  C-b / C-f    back / forward in history
+  C-v / M-v    scroll page down / up
+  C-s          find on page
+  f            follow a link by on-screen hint
+  C-x C-c      quit
+  C-h b        show ALL key bindings        M-x   run any command by name
+
 Prerequisite: Qt 6 WebEngine runtime installed system-wide
   (e.g. apt install qt6-webengine-dev libqt6webenginewidgets6, or distro
    equivalent). The Chromium sandbox is left enabled.