fix: address review feedback on async-std deprecation PR

- Cargo.toml: correct comment to say "compile_error" not "runtime panic"
- build_and_lint.yml: add note for contributors to manually add new features

Author: e-desouza

.github/workflows/build_and_lint.yml

@@ -36,6 +36,7 @@ jobs:
       - name: Clippy
         # Exclude async-std-rt: it is deprecated (RUSTSEC-2025-0052) and emits a
         # compile_error! at crate level, so --all-features would always fail.
+        # NOTE: When adding new Cargo features, add them to this list manually.
         run: cargo clippy --features std,tokio-rt,embassy-rt,actix-rt,futures-rt,smol-rt,core,wallet,models,utils,helpers,json-rpc,websocket,cli -- -D warnings
 
       - name: Build (default)

Cargo.toml

@@ -93,7 +93,7 @@ embassy-futures = { version = "0.1.1" }
 embedded-nal-async = { version = "0.8.0", optional = true }
 actix-rt = { version = "2.10.0", optional = true }
 # DEPRECATED: async-std has been discontinued (RUSTSEC-2025-0052). Use smol-rt instead.
-# Retained so the async-std-rt feature gate resolves; enabling it triggers a runtime panic.
+# Retained so the async-std-rt feature gate resolves; enabling it emits a compile_error.
 async-std = { version = "1.13.0", optional = true }
 futures-executor = { version = "0.3.30", optional = true }
 futures-timer = { version = "3.0.3", optional = true }