docs(terminal): only a full=1 pass without alt=recording is never mux-visible (#601 merge-time fix)

The geometry-retry comment in selectSession and the #435 invariant said the
route never answers full=1 with mux-visible; a shell load's alt=recording on
an alternate-screen pane now is. The conclusion holds (a useFullHistory pass
never sends it), so only the stated reason changes. Also lists
SHELL_LOAD_BASE_QUERY in terminal-tile.js's @dependency header.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/web/public/app.js

@@ -9744,8 +9744,9 @@ class CodemanApp {
         //
         // UNREACHABLE as written, and kept for the invariant rather than the
         // branch. A `useFullHistory` pass sends `full=1`, and the route answers
-        // `full=1` with `mux-full-history` or `history`, never `mux-visible`
-        // (see the source ladder in session-routes.ts), so the gate above
+        // a `full=1` pass without `alt=recording` (every `useFullHistory` pass;
+        // only shell loads send it) with `mux-full-history` or `history`, never
+        // `mux-visible` (see the source ladder in session-routes.ts), so the gate above
         // already rules out every pass that consumed the flag. Do not read this
         // line as evidence that a page load retries: it does not, and the test
         // suite pins that it does not.

src/web/public/terminal-tile.js

@@ -48,7 +48,7 @@
  *    Android tablet, or a large foldable unfolded in landscape, reaches.
  *
  * @dependency vendor/xterm.js, vendor/xterm-addon-fit.js
- * @dependency constants.js (window.CodemanTerminalFont, window.CodemanFetchDeadline, DEFAULT_SCROLLBACK, TERMINAL_TAIL_SIZE, SHELL_LOAD_QUERY, TERMINAL_CHUNK_SIZE)
+ * @dependency constants.js (window.CodemanTerminalFont, window.CodemanFetchDeadline, DEFAULT_SCROLLBACK, TERMINAL_TAIL_SIZE, SHELL_LOAD_BASE_QUERY, SHELL_LOAD_QUERY, TERMINAL_CHUNK_SIZE)
  * @dependency terminal-ui.js (codemanCurrentXtermTheme, codemanCurrentSkinIsLight, CodemanTerminalInput.shouldSuppressTerminalQueryResponse/isTerminalFocusOrMouseReport/wheelDeltaLines/wheelDeltaWholeLines/sgrWheelReports/pageKeysForTravel, app._shouldForwardWheelToApp/_localScrollbackIsHollow/_terminalViewportAtBottom/_clientPointToCell/_handleDesktopTerminalClick)
  * @dependency terminal-keycode229-recovery.js (window.CodemanKeyCode229Recovery, optional: absent, xterm's own textarea handling stands)
  * @loadorder 7.4 of 16, loaded after terminal-ui.js and before terminal-split.js