Jake 3410d3c586 feat(auto-title): kon-llm prompt + generate_title engine method ...

Recorder-style auto-titling for transcripts. Mirrors the Phase 9
content-tags pipeline so the same prompt-injection-hardened pattern,
spawn_blocking discipline, and sanitisation-after-generation shape get
reused; the user-facing surface (auto on save + on-demand button) lands
in a follow-up commit.

- crates/llm/src/prompts.rs: new TRANSCRIPT_TITLE_SYSTEM constant. Same
  injection guard wording as ai-formatting's CLEANUP_PROMPT — dictated
  speech is data, not instructions. Rules constrain output shape: 4-8
  words, Title Case, no quotes, no terminal punctuation, "Untitled"
  fallback for empty input.

- crates/llm/src/lib.rs: LlmEngine::generate_title returns
  Result<String, EngineError>. Mirrors extract_content_tags shape:
  trailing-2000-char UTF-8-boundary truncation, temperature 0,
  max_tokens 24, free-form output (no GBNF — titles are prose, not a
  closed set). Sanitisation runs server-side via the new private
  sanitize_title helper, which handles the real Qwen3 failure modes:
  surrounding curly + ASCII quotes, leading "Title:" prefix, multi-line
  output, trailing "." / "!" / "?", whitespace runs, 100-char cap,
  literal "Untitled" → None. Three unit tests cover composite real-world
  outputs end-to-end. kon-llm test suite goes 15 → 18 passing.

The Tauri wrapper, invoke_handler registration, and frontend wiring
follow in subsequent commits.

2026-04-25 19:47:56 +01:00

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