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/0053-comptime-pack-spread-into-any-slice.md

@@ -1,80 +0,0 @@
-**FIXED** via the `xx <pack>` bridge (the preferred fix below), not by changing
-
-> **RESOLVED.** Spreading a comptime pack into a `[]Any`/`[]P` parameter via `xx args` previously
-> hit the pack-as-value diagnostic ("pack has no runtime value") before `xx` was considered, so no
-> slice was ever materialized. Fixed by intercepting `xx <pack>` with a slice target in the
-> `unary_op .xx` arm of `lowerExpr` (`src/ir/lower/expr.zig`) *before* lowering the operand, calling
-> `lowerPackToSlice` (`src/ir/lower/pack.zig:167`) to box/erase each element into a runtime `[N]elem` → `[]elem`.
-> Covered by regression test `examples/0537-packs-pack-xx-to-slice.sx`.
-the `..args` spread. `xx args` with a slice target now materializes the pack
-into a runtime `[]Any`/`[]P` — see [examples/204-pack-xx-to-slice.sx](../examples/204-pack-xx-to-slice.sx).
-`lowerXX`/the unary-op arm intercepts `xx <pack>` before the pack-as-value
-check and calls the new `lowerPackToSlice` ([src/ir/lower.zig](../src/ir/lower.zig)).
-The bare `..args` spread into a non-variadic `[]Any` param is still unsupported
-(use `xx args`); left as-is.
-
-# Symptom
-
-Spreading a comptime pack `..$args` into a `[]Any` parameter — `f(..args)` where
-`f` takes `items: []Any` — fails LLVM verification:
-
-```
-LLVM verification failed: Incorrect number of arguments passed to called function!
-  %call = call i64 @log_count(ptr %0, { ptr, i64 }, { ptr, i64 }, double ...)
-```
-
-The spread passes the pack's N elements as N separate positional args instead of
-materialising a single `[]Any` slice for the one `items` parameter.
-
-# Reproduction
-
-```sx
-#import "modules/std.sx";
-log_count :: (items: []Any) -> i64 { return items.len; }
-forward :: (..$args) -> i64 { return log_count(..args); }
-main :: () -> i32 { print("{}\n", forward(1, "hi", 2.5)); return 0; }
-```
-
-Expected: `3` (the pack spreads into the `[]Any` slice, like calling
-`log_count(1, "hi", 2.5)` against a `[]Any` variadic would).
-
-# Preferred fix — `xx args` (pack → slice materialization)
-
-Rather than make the splat-y `..args` spread collapse into a single slice arg,
-the cleaner spelling is an **`xx` cast**, which already means "erase/convert to
-the expected type":
-
-```sx
-forward :: (..$args) -> i64 { return log_count(xx args); }   // target: []Any
-```
-
-`xx args` (target-typed) should materialize the pack into the expected slice:
-- target `[]Any`  → box each pack element to `Any`, build `[N]Any` → `[]Any`;
-- target `[]P`    → `xx`-erase each element to the protocol `P`, build `[N]P`
-  → `[]P` (reuse the slice-of-protocol erasure landed in `packVariadicCallArgs`,
-  issue 0052).
-
-This reuses the existing `xx`/protocol machinery, reads naturally, and keeps
-`..xs` reserved for true spreads into pack/variadic callees.
-
-**Currently `xx args` errors** ("pack 'args' has no runtime value") because the
-Step 2.7 pack-as-value check fires on the bare `args` operand before `xx` is
-considered. The fix: in `xx` (unary_op `.xx`) lowering, intercept a pack operand
-*before* the pack-as-value diagnostic and, when the target type is a slice,
-materialize as above.
-
-# Workaround today
-
-Declare the forwarder as the **slice** variadic instead of a pack — then it's
-already a runtime `[]Any` and forwards directly:
-
-```sx
-forward :: (..args: []Any) -> i64 { return log_count(args); }   // works -> 3
-```
-
-This is what `examples/162-pack-bare-args.sx` demonstrates.
-
-# Verification
-
-After the fix, `log_count(xx args)` (and the original `..args` form, if also
-fixed) should print `3` and pass `sx ir` LLVM verification.