Fixes for M-02 to M-14, G-01 to G-14, K-02 to K-04, X-04 to X-14, not yet reviewed

Committed before review so Windows and WSL builds can start.
Each fix was tested and mutation-checked here; the codex review
of each item is still to come, so tasks/BUGS.md stays unticked.

M-02 is mid-review: round 1 findings are fixed (apps/ely-mark/src/tally.rs).
K-01 stays deferred. The ElyMark window test mark-outside.sh failed
once at its crash-recovery step in the last run; not yet looked into.

apps/ely-mark/src/outside.rs

@@ -308,6 +308,8 @@ impl Desk {
             return None;
         }
         tab.extra.base = disk.text.clone();
+        // The file holds the disk's text: it is saved.
+        tab.mark = crate::engine::mark(&disk.text);
         tab.extra.restart_autosave();
         // Its bytes (BOM, line ends) are what saves keep now.
         tab.doc.lock().expect("the text lock").source = disk.clone();