ci: add GitHub Actions workflows with semantic-release auto-versioning

chore: fix all 702 clippy warnings across codebase
- auto-fix 475 via cargo clippy --fix
- fix remaining 227 manually: uninlined_format_args, redundant_closure, match_same_arms,
  underscore_binding, format_push_string, items_after_statements, needless_pass_by_value,
  clone_on_copy, case_sensitive_extension, single_match/let-else, write_with_newline,
  and other clippy lints

src/tool/memory/remember.rs

@@ -89,8 +89,8 @@ impl Tool for Remember {
         };
 
         memory.write(&ctx.memory_dir)
-            .map_err(|e| anyhow!("failed to write memory '{}': {}", name, e))?;
+            .map_err(|e| anyhow!("failed to write memory '{name}': {e}"))?;
 
-        Ok(format!("saved memory '{}' ({})", name, kind))
+        Ok(format!("saved memory '{name}' ({kind})"))
     }
 }