fix(bug-filing-mcp): drop unnecessary @ptrCast from the adapter dispatch call (CWE-704) (#91)

<!-- SPDX-License-Identifier: CC-BY-SA-4.0 -->

## Summary

Follow-up to #89 (fixed the FFI shim's internal `@ptrCast`s across all
116 cartridges) and #90 (shipped bug-filing-mcp's new adapter with the
old pre-#89 dispatch pattern, mirrored from k9iser-mcp before its own
equivalent was cleaned up). Drops the three now-unnecessary `@ptrCast`
calls at the adapter's dispatch call site — the same CWE-704 finding
class, one file further down the stack.

Confirmed with a standalone `zig build-obj` test before touching the
real file: Zig's `[*c]` pointer parameters accept array/slice/scalar
pointers via implicit C-pointer coercion, so the explicit casts were
doing nothing.

## Schema-validation note

- [ ] This PR adds or modifies one or more `cartridge.json` manifests.
- [x] This PR does not touch any `cartridge.json`.

## Testing

- `zig build test` (0.15.2): green.
- Rebuilt the binary and re-ran the live smoke test (REST dispatch to
`/invoke?tool=submit_feedback`, 404 on unknown route) — confirmed no
behavioral change.

## Refs

Follow-up to #89/#90. Part of #274. Same fix will be applied to the
bundled snapshot in `boj-server`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_017LDhR8gtnittEWSafunnrq

---
_Generated by [Claude
Code](https://claude.ai/code/session_017LDhR8gtnittEWSafunnrq)_

Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath

cartridges/domains/development/bug-filing-mcp/adapter/bug_filing_mcp_adapter.zig

@@ -103,7 +103,10 @@ fn dispatch(tool: []const u8, args_json: []const u8, out: []u8) Dispatch {
     abuf[a.len] = 0;
 
     var len: usize = out.len;
-    const rc = ffi.boj_cartridge_invoke(@ptrCast(&tnbuf), @ptrCast(&abuf), @ptrCast(out.ptr), &len);
+    // No @ptrCast needed (CWE-704 fix, matching #89's cartridge_shim.zig
+    // pattern): [*c] parameters accept array/slice/scalar pointers via
+    // Zig's own implicit C-pointer coercion.
+    const rc = ffi.boj_cartridge_invoke(&tnbuf, &abuf, out.ptr, &len);
     return switch (rc) {
         0 => .{ .status = 200, .body = out[0..len] },
         -1 => .{ .status = 404, .body = "{\"error\":\"unknown-tool\"}" },