fix: clean warnings; modernize CI to tag-triggered publish

- Remove unused BTreeMap import (lib.rs)
- Remove unused TomllmError import (parser.rs)
- Prefix _is_annotation to silence unused-variable warning
- rust-ci.yml: actions-rs/toolchain → dtolnay/rust-toolchain (maintained)
- rust-ci.yml: publish gated on v* tags, not every main push

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: elasticdotventures

.github/workflows/rust-ci.yml

@@ -3,6 +3,7 @@ name: Rust CI
 on:
   push:
     branches: [main]
+    tags: ["v*"]
   pull_request:
     branches: [main]
 
@@ -11,20 +12,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - run: cargo test --all-features
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo test
+      # 🤓 wasm feature compiles to rlib on native — wasm32 target only needed for actual WASM artifact
+      - run: cargo test --features wasm
 
   publish-crate:
+    name: Publish to crates.io
     needs: test
-    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    # 🤓 gate on tags (v*) — push a `git tag v0.1.0 && git push --tags` to trigger
+    if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - run: cargo publish --token ${{ secrets.CRATESIO_API_TOKEN }}
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Publish
+        run: cargo publish --token ${{ secrets.CRATESIO_API_TOKEN }}

src/lib.rs

@@ -30,7 +30,6 @@
 //! # tier: sm0l
 //! ```
 
-use std::collections::BTreeMap;
 use thiserror::Error;
 
 #[cfg(feature = "wasm")]

src/parser.rs

@@ -3,7 +3,7 @@
 use std::collections::BTreeMap;
 use serde::{Deserialize, Serialize};
 
-use crate::{Result, TomllmError};
+use crate::Result;
 use crate::map_block::MapBlock;
 use crate::stripper::{extract_comments, strip};
 
@@ -99,7 +99,7 @@ impl TomllmDoc {
 
         for (line_idx, comment_text) in &all_comments {
             // Check if this is an annotation-style comment
-            let is_annotation = ANNOTATION_PREFIXES
+            let _is_annotation = ANNOTATION_PREFIXES
                 .iter()
                 .any(|prefix| comment_text.starts_with(prefix));