term: move the term core to subprojects/term

The core now builds, tests, and benchmarks alone, as a Meson subproject
with no dependency on the main tree.

- include/term/ holds term.h and the header-only unicode/. src/ holds
  the core and its private headers. The main tree gets only
  include/term through term_dep, so it cannot reach a private header.
- The term tests, the term benchmarks, the Kitty parser suite, and
  tools/amalgamate.py and tools/generate_unicode.py move with it. The
  tests run as term:<name>.
- The main build passes its -march (arch_flag) and b_ndebug to the
  subproject. A directory configured before this commit needs
  meson configure -Dterm:arch_flag=-march=... once.
- The term tests compile with -UNDEBUG. They do work inside assert.
- The subproject exports term_test_dep with term_api.h, for the main
  tree's render, thumbnail, color, and selection tests.
- The Kitty bridge used struct vector2i and has not compiled since the
  public API redesign. It builds again. 2 of its 14 tests fail: REP
  after a tab, and a cursor report after a resize.
- dirgraph.py drops the term and unicode layers. Its self-test uses pty.
- The symbols test ignores the __odr_asan symbols that ASan adds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/extern/kitty/kitty_harness.py b/tests/extern/kitty/kitty_harness.py
new file mode 100644
index 0000000..d528478
--- /dev/null
+++ b/tests/extern/kitty/kitty_harness.py
@@ -0,0 +1,46 @@
+"""Test harness for running Kitty's parser.py test suite.
+
+Provides :class:`BaseTest`, :class:`CmdDump`, and re-exports ``parse_bytes``
+from ``kitty_parser`` (written by a separate subagent).
+"""
+
+import unittest
+
+from kitty_parser import parse_bytes
+
+
+class CmdDump(list):
+    """Collects parser events, matching Kitty's ``CmdDump``."""
+
+    def __call__(self, window_id, *a):
+        if a and a[0] == 'bytes':
+            return
+        if a and a[0] == 'error':
+            a = a[1:]
+        self.append(tuple(a))
+
+    def get_result(self):
+        current = ''
+        q = []
+        for args in self:
+            if args[0] == 'draw':
+                current += args[1]
+            else:
+                if current:
+                    q.append(('draw', current))
+                    current = ''
+                q.append(args)
+        if current:
+            q.append(('draw', current))
+        return tuple(q)
+
+
+class BaseTest(unittest.TestCase):
+    """Base test class matching Kitty's test API."""
+
+    def ae(self, a, b, msg=None):
+        self.assertEqual(a, b, msg)
+
+    def create_screen(self, cols=5):
+        from screen import Screen
+        return Screen(cols, 5)  # 5 rows like Kitty