workspace: drop the nested wasmi fork wiring from the build

Reverts the accommodations that let `pyre-wasm-runner` path-depend on the
untracked `wasmi/crates/wasmi` fork, which lives outside the repository:

- root Cargo.toml: remove `exclude = ["wasmi", "cel-rust",
  "pyre/pyre-wasm-runner"]` and restore `pyre/pyre-wasm-runner` to `members`,
  so it is a workspace member again rather than its own workspace root.
- pyre-wasm-runner/Cargo.toml: `wasmi = "1.1"` from crates.io again, and
  version/edition/wasmtime inherited from the workspace again.
- pyre-wasm-runner/src/wasmi_host.rs: back to the HashMap trace registry; the
  shared-indirect-table dispatch used the fork-only `Nullable` API.
- check.py: build the runner with `-p` again, without fork-presence gating of
  the build step or of the default backend set.
- pyre-ci.yml: run the wasm codegen_test step unconditionally on Linux.
- Cargo.lock: restores the wasmtime dependency tree the exclusion had dropped;
  the only remaining delta against main is the new `cel` example package.

Assisted-by: Claude

Author: youknowone

.github/workflows/pyre-ci.yml

@@ -437,18 +437,12 @@ jobs:
       # majit-backend-wasm/tests/codegen_test.rs holds two #[ignore]d runtime
       # integration tests that run a bench on both the dynasm and wasm backends
       # and compare, so they need the release pyre-dynasm + pyre-wasm-runner and
-      # the wasm-host module. check.py builds all three on Linux only when the
-      # nested `wasmi` fork the runner path-depends on is present (it is excluded
-      # from the outer workspace and absent in CI); this step gates on the same
-      # fork so it skips wherever those artifacts were not built. The plain
-      # `cargo test --all` job cannot run these: it never builds those artifacts.
+      # the wasm-host module. check.py has just built all three on Linux (it adds
+      # the wasm32 target above; WASM_MODULE_PATH is the .wasm-host.wasm the test
+      # loads), so run the ignored tests against them here. The plain
+      # `cargo test --all` job cannot: it never builds those artifacts.
       if: runner.os == 'Linux'
-      run: |
-        if [ ! -f wasmi/crates/wasmi/Cargo.toml ]; then
-          echo "Skipping: nested wasmi fork absent; pyre-wasm-runner and wasm-host module were not built."
-          exit 0
-        fi
-        cargo test -p majit-backend-wasm --test codegen_test -- --ignored
+      run: cargo test -p majit-backend-wasm --test codegen_test -- --ignored
 
   pyre-check-macos:
     name: pyre/check.py (macos-latest)