Character codes in typed text; the site and relay at app.kokkoja.com

With the Text tool, Klammertext's codes give letters a keyboard lacks:
^o" is ö, ^s^ ß, ^a1 ā, ^130ED^ a code point of 4 to 6 digits,
^9053 53EF^ a sequence, ^^ a caret, replaced as each code is completed.
The public site and relay moved to app.kokkoja.com; the old name
redirects.  The Markdown documentation is withdrawn from the release
while it is converted to Klammertext; the README's links to it are
stale until then.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/test_end_to_end.py

@@ -1346,6 +1346,51 @@ class EndToEndTest(unittest.TestCase):
         firefox.switch_to(host_tab)
         firefox.go("about:blank")
 
+    def test_character_codes_in_text(self):
+        """Andy, 2026-10-13: Klammertext's character codes in a text
+        block, replaced as each is completed; the field's own undo
+        survives a replacement."""
+        firefox = self.firefox
+        host_tab = firefox.current_tab()
+        firefox.go(self.address("Late"))
+        self.enter_name("Typist", "start_session")
+        invitation = firefox.run("return document.getElementById('invitation').value;")
+        guest_tab = firefox.new_tab()
+        firefox.go(self.address("Student", join=invitation))
+        self.enter_name("Onlooker", "join_session")
+        self.wait_until(lambda s: s["page"]["number"] == 1 and len(s["participants"]) == 2, "the onlooker")
+        firefox.switch_to(host_tab)
+        field_text = lambda: firefox.run("return document.querySelector('.text_field').value;")
+
+        firefox.run("document.querySelector('[data-tool=text]').click();")
+        firefox.run(TEXT_GESTURE, 0.2, 0.3, 0.2, 0.3)
+        firefox.type_into(".text_field", 'Gr^u"^s^e, ^a` 2^^3, ^OE^uvre, ^00E9^, m^a1, ^130ED^ ^9053 53EF^')
+        self.assertEqual(field_text(), "Grüße, à 2^3, Œuvre, é, mā, 𓃭 道可")
+        self.wait_until(lambda s: s["texts"]["Typist"] and s["texts"]["Typist"][0]["text"] == "Grüße, à 2^3, Œuvre, é, mā, 𓃭 道可",
+                        "the text with its codes replaced")
+        # The caret counts UTF-16 units, so the hieroglyph counts twice.
+        self.assertEqual(firefox.run("return document.querySelector('.text_field').selectionStart;"),
+                         len("Grüße, à 2^3, Œuvre, é, mā, 𓃭 道可".encode("utf-16-le")) // 2)
+
+        # In the middle of the text too, and only at the caret: the ^
+        # left earlier stays.
+        firefox.run("const f = document.querySelector('.text_field'); f.setSelectionRange(2, 2);")
+        firefox.type_into(".text_field", "^o-")
+        self.assertEqual(field_text(), "Grōüße, à 2^3, Œuvre, é, mā, 𓃭 道可")
+        self.assertEqual(firefox.run("return document.querySelector('.text_field').selectionStart;"), 3)
+
+        # The browser's own undo in the field is not lost by a replacement:
+        # one step gives back the code as typed.
+        firefox.chord("\ue009", "z")
+        self.assertEqual(field_text(), "Gr^o-üße, à 2^3, Œuvre, é, mā, 𓃭 道可")
+
+        firefox.run("document.querySelector('[data-tool=pen]').click();")
+        shown = self.wait_until(lambda s: s["texts"]["Typist"] and "üße" in s["texts"]["Typist"][0]["text"],
+                                "the finished block")["texts"]["Typist"][0]["text"]
+        firefox.switch_to(guest_tab)
+        self.wait_until(lambda s: s["texts"].get("Typist") and s["texts"]["Typist"][0]["text"] == shown,
+                        "the onlooker to see the same text")
+
     def test_text_being_typed_stays_on_the_page_left(self):
         """Andy, 2026-10-06: a guest was typing when the host pressed New,
         and the text reappeared on the new page."""