test: remove resolved/fixed issue writeups

Delete the issues/*.md whose writeup carries a RESOLVED or FIXED banner;
only the open issues (0030, 0148) remain.

issues/0085-nested-slice-literal-elements-not-coerced.md

@@ -1,55 +0,0 @@
-# 0085 — nested slice literal elements are stored as raw arrays
-
-> **RESOLVED.** Root cause: `Lowering.lowerArrayLiteral` lowered each element with
-> the element type as `target_type` but appended the returned value directly. For
-> a nested `.[...]` element whose expected element type is a slice (`[]T`), the
-> inner literal still lowers to an aggregate ARRAY `[N]T` — so the outer aggregate
-> (typed array-of-`[]T`) held raw arrays where slice {ptr,len} headers were
-> expected; indexing the inner slice read a garbage pointer and segfaulted. Fix:
-> after lowering each element, when the element type is a slice and the lowered
-> value is a same-element array, coerce it via the existing `array_to_slice` op
-> (materialize backing storage + build the header) — identical to the whole-
-> literal coercion the var-decl / call-arg paths already run. The coercion
-> recurses with the nesting, so `[][]T` and deeper materialize at every level.
-> Files: `src/ir/lower.zig` (`lowerArrayLiteral`). Regression:
-> `examples/0142-types-nested-slice-literal-elements.sx` (`[][]i64` + `[][]string`,
-> local-bound AND direct-call-argument forms).
-
-## Symptom
-Nested array/slice literals such as `.[.[1, 2], .[3, 4]]` miscompile when the
-expected element type is a slice (`[][]i64`). Observed: both the local-bound and
-direct-call forms segfault while indexing the inner slice. Expected: both forms
-materialize each inner `[N]T` literal as a `[]T` slice and print the same value.
-
-## Reproduction
-```sx
-#import "modules/std.sx";
-
-sum_nested :: (xss: [][]i64) -> i64 {
-    return xss[0][1] + xss[1][0];
-}
-
-main :: () {
-    local : [][]i64 = .[.[1, 2], .[3, 4]];
-    print("local={}\n", sum_nested(local));
-    print("direct={}\n", sum_nested(.[.[1, 2], .[3, 4]]));
-}
-```
-Observed on `flow/sx-foundation/F0.4`: segfault at address `0x9` before either
-line prints. Expected output:
-```text
-local=5
-direct=5
-```
-
-## Investigation prompt
-Fix nested slice literal materialization. The likely area is
-`src/ir/lower.zig` in `Lowering.lowerArrayLiteral`: the outer literal can know
-its expected element type is `[]T`, and the loop sets `self.target_type =
-elem_ty` while lowering each inner literal, but it appends the returned value
-directly. For an inner `.[...]`, that returned value is still an array aggregate
-`[N]T`, not the target `[]T` slice. Add per-element coercion/materialization
-after lowering each element, using the element source type and expected
-`elem_ty` (the existing `array_to_slice` coercion should be reused). Verify the
-repro prints `local=5` and `direct=5`, then run `zig build && zig build test &&
-bash tests/run_examples.sh`.