@sentry/wasm: `wasm://wasm/` frames miss `debug_meta` on non-streaming `instantiate(buffer)`

### Description

### Problem
`fetch` → `arrayBuffer()` → `WebAssembly.instantiate(buffer)` can produce frames like:
`wasm://wasm/0bee4c4e:wasm-function[1]:0x8c` (no file URL).

Module is registered, but `patchFrames` fails: streaming regex matches first, `getImage('wasm://wasm/…')` misses, `debug_meta.images` never attached.

### Works / breaks
- ✅ `instantiateStreaming`
- ✅ `instantiate(buffer)` when stack has `http://…/file.wasm:wasm-function[…]` (Emscripten, dev Rust)
- ❌ `instantiate(buffer)` + `wasm://wasm/…` (minimal wasm, e2e `simple.wasm`)
- ❌ 2+ registered wasm modules (`wasm://wasm/` not mappable)
- ❌ module not registered (no `build_id` / untagged buffer)

### Proposed fix
1. Handle `wasm://wasm/…` before streaming regex
2. Map to sole registered module when count === 1
3. `postprocessEvent` hook
4. Browser e2e: `suites/wasm/nonStreaming/`

### Limitation
Single registered wasm module only until multi-module mapping exists.