story-kit: create 192_bug_code_fences_lose_newlines_when_pasted_from_agent_output

.story_kit/work/1_upcoming/192_bug_code_fences_lose_newlines_when_pasted_from_agent_output.md

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+---
+name: "Code fences lose newlines when pasted from agent output"
+---
+
+# Bug 192: Code fences lose newlines when pasted from agent output
+
+## Description
+
+When the assistant pastes a multi-line Rust function using a fenced code block, the second half of the code loses its line breaks and renders as a single long line. This has been reproduced twice in the Matrix chat interface.
+
+## How to Reproduce
+
+1. Ask the assistant to paste a multi-line Rust function in a fenced code block
+2. The function `mentions_bot()` from the matrix bot module was used as the test case
+3. Observe the rendered output in Matrix
+
+## Actual Result
+
+The first portion of the code block renders with proper newlines, but partway through (around the `let short = format!(...)` line), all remaining lines collapse into a single line with no line breaks.
+
+## Expected Result
+
+The entire code block should render with proper newlines preserved, matching the original source formatting.
+
+## Acceptance Criteria
+
+- [ ] Code fences with multi-line content preserve all newlines when sent through the Matrix bot interface
+- [ ] Verify the issue is not a Matrix client rendering bug vs. a message sending bug (inspect the raw message content)