Fix CI: MSRV check with --no-default-features, update macOS runner

- MSRV job: add --no-default-features so Rust 1.85 check skips MCP
  deps (rmcp → darling 0.23 requires Rust 1.88)
- Release: update x86_64-apple-darwin runner from macos-13 (retired)
  to macos-14 (ARM, cross-compiles x86_64 natively)

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

Author: porco-rs

.github/workflows/ci.yml

@@ -72,7 +72,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: "1.85"
-      - run: cargo check --workspace
+      - run: cargo check --workspace --no-default-features
 
   # Separater Job: Security Audit
   audit:

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
           - target: aarch64-apple-darwin
             os: macos-latest
           - target: x86_64-apple-darwin
-            os: macos-13
+            os: macos-14
           - target: x86_64-unknown-linux-gnu
             os: ubuntu-latest
           - target: aarch64-unknown-linux-gnu