Five fixes from observed chat where user asked to complete two
tasks by title but the LLM had no way to find their IDs:
1. Tool result history: messagesToLlm() now includes previous
tool_result messages as "[Previous tool result]" entries so
the LLM can reference IDs/data from earlier turns.
2. Bare JSON tool call fallback: extractToolCall() now also
matches bare {"name":..., "params":...} JSON without the
```tool fence — the LLM kept dropping the fence.
3. IDs in list message: list_tasks now formats each entry as
"• [abc123] Title" so the LLM has the ID alongside the title.
4. New complete_tasks_by_title tool: case-insensitive substring
match, completes all matches at once. Handles "erledige beide
sicher sicher tasks" without needing IDs.
5. System prompt updates: explains the [id] bracket convention,
warns the LLM to NEVER show raw IDs to users, and references
the new tool for title-based completion.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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