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/app/state/misc.rs

@@ -139,7 +139,7 @@ impl InputState {
         self.autocomplete_candidates = COMMANDS
             .iter()
             .filter(|c| c.starts_with(&prefix))
-            .map(|c| c.to_string())
+            .map(std::string::ToString::to_string)
             .collect();
         self.autocomplete_prefix = prefix;
         self.autocomplete_idx = 0;
@@ -178,10 +178,10 @@ impl InputState {
     pub fn tab_complete(&mut self) {
         // Legacy inline tab-complete — used as a fallback when the dropdown
         // isn't visible yet. Opens the dropdown on the first Tab press.
-        if !self.autocomplete_visible {
-            self.open_autocomplete();
-        } else {
+        if self.autocomplete_visible {
             self.cycle_autocomplete(true);
+        } else {
+            self.open_autocomplete();
         }
     }
 
@@ -232,7 +232,7 @@ impl InputState {
                         .open(path)
                     {
                         use std::io::Write;
-                        let _ = writeln!(file, "{}", result);
+                        let _ = writeln!(file, "{result}");
                     }
                 }
             }
@@ -294,10 +294,11 @@ pub struct MiscState {
     pub tick_count: u64,
     pub todo_content: String,
     /// Pipeline mode override set by `/pipeline` command.
-    /// - `None`: auto-detect (default)
-    /// - `Some("full")`: force full pipeline
-    /// - `Some("quick")`: force quick pipeline
-    /// - `Some("skip")`: skip pipeline, handle directly
+    ///  - `None`: auto-detect (default)
+    ///  - `Some("full")`: force full pipeline
+    ///  - `Some("quick")`: force quick pipeline
+    ///  - `Some("skip")`: skip pipeline, handle directly
+    ///
     /// Consumed on the next agent turn.
     pub pipeline_override: Option<String>,
 }