fix(tui): truncate session titles by chars, not bytes (v0.2.2)

Real-world panic reported on a Cyrillic prompt:

  thread main panicked at session_list.rs:348:36:
  end byte index 80 is not a char boundary; it is inside у (bytes 79..81)

The session title truncator was slicing the string by raw byte offset
(), which lands in the middle of any multi-byte UTF-8
character (Cyrillic, CJK, emoji). Replaced with a small  helper that takes by Unicode scalars via chars().take(N).

Same fix applied to the fallback Session <id> path for consistency,
even though session_id is currently always ASCII (ULID).

Tests:
- truncate_ascii_under_limit_returns_input_as_is
- truncate_ascii_over_limit_appends_ellipsis
- truncate_cyrillic_does_not_panic_at_char_boundary  ← regression
- truncate_emoji_counts_by_chars_not_bytes
- truncate_exact_length_no_ellipsis

Drive-by: also fix lingering clippy::doc_lazy_continuation in
classifier_eval.rs that was failing CI (test docstring).

Manifests: workspace + tj-cli + tj-mcp + plugin.json + marketplace.json
all bumped to 0.2.2 (patch).

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

Author: Shahinyanm

.claude-plugin/marketplace.json

@@ -6,14 +6,14 @@
   },
   "metadata": {
     "description": "Task Journal — append-only reasoning chain memory for AI-coding tasks",
-    "version": "0.2.1"
+    "version": "0.2.2"
   },
   "plugins": [
     {
       "name": "task-journal",
       "source": "./plugin",
       "description": "Append-only journal of AI-coding task reasoning chains. Captures hypotheses, decisions, rejections, evidence — renders compact resume packs so an agent can pick up a 2-week-old task with full context.",
-      "version": "0.2.1",
+      "version": "0.2.2",
       "author": {
         "name": "Digital-Threads"
       },

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.2] - 2026-05-07
+
+Hotfix release. No new features.
+
+### Fixed
+- TUI session browser (`task-journal ui`) panicked with `byte index is
+  not a char boundary` when a session's first user message was longer
+  than 80 bytes and contained non-ASCII characters (Cyrillic, CJK,
+  emoji, etc.). Title truncation now slices by Unicode scalars instead
+  of bytes. Same fix applied to the fallback `Session <id>` path for
+  consistency.
+- Added regression tests covering Cyrillic, emoji, and exact-boundary
+  inputs for the new `truncate_with_ellipsis` helper.
+
 ## [0.2.1] - 2026-05-07
 
 Operational maturity release. No breaking changes — additive features

Cargo.lock

@@ -7,7 +7,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.2.1"
+version = "0.2.2"
 edition = "2021"
 rust-version = "1.83"
 license = "MIT"

Cargo.toml

@@ -16,7 +16,7 @@ name = "task-journal"
 path = "src/main.rs"
 
 [dependencies]
-tj-core = { package = "task-journal-core", version = "0.2.1", path = "../tj-core" }
+tj-core = { package = "task-journal-core", version = "0.2.2", path = "../tj-core" }
 anyhow = { workspace = true }
 clap = { workspace = true }
 tracing = { workspace = true }

crates/tj-cli/Cargo.toml

@@ -336,21 +336,27 @@ impl SessionList {
     }
 }
 
+fn truncate_with_ellipsis(text: &str, max_chars: usize) -> String {
+    let mut chars = text.chars();
+    let head: String = chars.by_ref().take(max_chars).collect();
+    if chars.next().is_some() {
+        format!("{head}…")
+    } else {
+        head
+    }
+}
+
 fn session_title(s: &ParsedSession) -> String {
     if let Some(text) = s.first_user_text() {
         let clean = strip_xml_tags(&text);
         let line = clean
             .lines()
             .find(|l| !l.trim().is_empty())
             .unwrap_or(&clean);
-        let trimmed = line.trim();
-        if trimmed.len() > 80 {
-            format!("{}…", &trimmed[..80])
-        } else {
-            trimmed.to_string()
-        }
+        truncate_with_ellipsis(line.trim(), 80)
     } else {
-        format!("Session {}", &s.session_id[..8.min(s.session_id.len())])
+        let head: String = s.session_id.chars().take(8).collect();
+        format!("Session {head}")
     }
 }
 
@@ -422,3 +428,42 @@ fn shorten_path(path: &str) -> String {
         parts[parts.len() - 2..].join("/")
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::truncate_with_ellipsis;
+
+    #[test]
+    fn truncate_ascii_under_limit_returns_input_as_is() {
+        assert_eq!(truncate_with_ellipsis("hello", 80), "hello");
+    }
+
+    #[test]
+    fn truncate_ascii_over_limit_appends_ellipsis() {
+        let long = "a".repeat(100);
+        let out = truncate_with_ellipsis(&long, 10);
+        assert_eq!(out, format!("{}…", "a".repeat(10)));
+    }
+
+    #[test]
+    fn truncate_cyrillic_does_not_panic_at_char_boundary() {
+        let cyr = "Можешь ли ты проанализировать проект? Мне нужен вот md файл, то есть который описывает, вообще делает этот проект. Все полностью.";
+        let out = truncate_with_ellipsis(cyr, 80);
+        assert!(out.ends_with('…'));
+        assert_eq!(out.chars().count(), 81);
+    }
+
+    #[test]
+    fn truncate_emoji_counts_by_chars_not_bytes() {
+        let s = "🦀".repeat(50);
+        let out = truncate_with_ellipsis(&s, 10);
+        assert!(out.ends_with('…'));
+        assert_eq!(out.chars().filter(|c| *c == '🦀').count(), 10);
+    }
+
+    #[test]
+    fn truncate_exact_length_no_ellipsis() {
+        let s: String = (0..80).map(|_| 'x').collect();
+        assert_eq!(truncate_with_ellipsis(&s, 80), s);
+    }
+}

crates/tj-cli/src/tui/session_list.rs

@@ -7,6 +7,7 @@
 //!    - the fixture has at least 30 examples
 //!    - every example has a recognised `expected` event_type
 //!    - the prompt builder always emits the input text into the prompt
+//!
 //!    No model API is called. Deterministic, hermetic.
 //!
 //! 2. **Opt-in real classifier (`TJ_CLASSIFIER_EVAL=on`).** Calls

crates/tj-core/tests/classifier_eval.rs

@@ -16,7 +16,7 @@ name = "task-journal-mcp"
 path = "src/main.rs"
 
 [dependencies]
-tj-core = { package = "task-journal-core", version = "0.2.1", path = "../tj-core" }
+tj-core = { package = "task-journal-core", version = "0.2.2", path = "../tj-core" }
 anyhow = { workspace = true }
 tokio = { workspace = true }
 tracing = { workspace = true }

crates/tj-mcp/Cargo.toml

@@ -1,6 +1,6 @@
 {
   "name": "task-journal",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Append-only journal of AI-coding task reasoning chains: hypotheses, decisions, rejections, evidence. Renders compact resume packs so an agent can pick up a 2-week-old task with full context.",
   "author": {
     "name": "Mher Shahinyan"

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "task-journal",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Append-only journal of AI-coding task reasoning chains. Captures hypotheses, decisions, rejections, evidence — renders compact resume packs so an agent can pick up a 2-week-old task with full context.",
   "author": {
     "name": "Mher Shahinyan",