issues: mark 0041, 0042, 0043, 0047 FIXED

Triage pass: every issue file in `issues/` was re-verified against
HEAD. Three (0041, 0042, 0043) reproduce no longer — they were
silently fixed by adjacent work since the issue was filed. 0047
landed in the previous commit. All four header sections now lead
with **FIXED** + a one-line locator so the next reader doesn't
re-investigate.

After this, `issues/` is the actual open-issue list:

| Issue | Status |
|---|---|
| 0041 | FIXED (silently, by alias/parser work) |
| 0042 | FIXED (silently, type_alias_map lookup landed) |
| 0043 | FIXED (silently, lazy-lower foreign-class dispatch) |
| 0044 | FIXED |
| 0045 | FIXED |
| 0046 | FIXED |
| 0047 | FIXED (commit 0119c9c) |
| 0048 | FIXED (commit 0ede097) |
| 0049 | FIXED (commit b5301c4) |
| 0050 | FIXED (commit 5316bf7) |

No open issues remain. The files stay in tree as a record; new
issues take the next free number (0051).

issues/0043-lazy-lower-loses-foreign-class-method-dispatch.md

@@ -1,5 +1,16 @@
 # issue-0043: lazy-lowered function bodies don't resolve foreign-class method dispatch
 
+**FIXED.** The original repro
+(`sx build --target ios-sim issue-0043.sx` with a
+`UIWindow.alloc().initWithWindowScene(scene)` call inside an
+`inline if OS == .ios { ... }`-gated function called transitively
+from `caller :: (...) callconv(.c)`) compiles cleanly today; chess
+on iOS-sim runs end-to-end through the same dispatch shape. The
+fix lives in tree as part of broader foreign-class /
+lazyLowerFunction work — no specific commit isolates it.
+
+Below preserved as a record of the original problem.
+
 ## Symptom
 
 When a function `B` containing `recv.method(...)` calls against a