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/forget.rs

@@ -43,8 +43,8 @@ impl Tool for Forget {
             .ok_or_else(|| anyhow!("missing required argument: name"))?;
 
         Memory::remove(&ctx.memory_dir, name)
-            .map_err(|e| anyhow!("failed to remove memory '{}': {}", name, e))?;
+            .map_err(|e| anyhow!("failed to remove memory '{name}': {e}"))?;
 
-        Ok(format!("removed memory '{}'", name))
+        Ok(format!("removed memory '{name}'"))
     }
 }

src/tool/memory/recall.rs

@@ -1,5 +1,6 @@
 //! Tool for reading a single memory entry or listing the whole memory index.
 
+use std::fmt::Write;
 use serde_json::{json, Value};
 use anyhow::{Result, anyhow};
 use super::super::Tool;
@@ -39,10 +40,10 @@ impl Tool for Recall {
     fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
         if let Some(name) = args.get("name").and_then(|v| v.as_str()) {
             if name.is_empty() {
-                return list_all(ctx);
+                return Ok(list_all(ctx));
             }
             let memory = Memory::read(&ctx.memory_dir, name)
-                .map_err(|e| anyhow!("memory '{}' not found: {}", name, e))?;
+                .map_err(|e| anyhow!("memory '{name}' not found: {e}"))?;
             Ok(format!(
                 "---\nname: {}\ndescription: {}\nkind: {}\nlifecycle: {}\n---\n\n{}",
                 memory.name,
@@ -52,7 +53,7 @@ impl Tool for Recall {
                 memory.content,
             ))
         } else {
-            list_all(ctx)
+            Ok(list_all(ctx))
         }
     }
 }
@@ -63,18 +64,18 @@ impl Tool for Recall {
 ///       fall back to bare name if the file can't be parsed.
 ///
 /// Return: `Ok` with the formatted index (never fails; missing dir yields "(no memory entries)").
-fn list_all(ctx: &ToolCtx) -> Result<String> {
+fn list_all(ctx: &ToolCtx) -> String {
     let names = Memory::list(&ctx.memory_dir);
     if names.is_empty() {
-        return Ok("(no memory entries)".to_string());
+        return "(no memory entries)".to_string();
     }
-    let mut lines = format!("Memory index ({} entries):\n", names.len());
+    let mut lines = String::new();
     for name in &names {
         if let Ok(mem) = Memory::read(&ctx.memory_dir, name) {
-            lines.push_str(&format!("- {} [{}]: {}\n", name, mem.kind, mem.description));
+            let _ = writeln!(lines, "- {} [{}]: {}", name, mem.kind, mem.description);
         } else {
-            lines.push_str(&format!("- {}\n", name));
+            let _ = writeln!(lines, "- {name}");
         }
     }
-    Ok(lines)
+    lines
 }

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})"))
     }
 }