feat: Add fenced multi-line message format (<<< ... >>>)#26
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Implements unambiguous multi-line message parsing using fence markers. The new syntax allows agents to send messages with blank lines, code blocks, and complex formatting without truncation: ->relay:Target <<< Multi-line content here. Can include blank lines. >>> - Added fenced inline parsing state machine in parser.ts - Added 13 comprehensive tests for fenced format - Updated CLAUDE.md documentation with new format - All 492 tests pass Fixes the fundamental issue where multi-line messages with complete line breaks would get cut off after the first line.
Updates documentation across all agent-facing files: - AGENTS.md: Added fenced format section and examples - docs/AGENTS.md: Added fenced format to quick reference - .claude/skills/using-agent-relay/SKILL.md: Added to quick reference and examples - src/wrapper/tmux-wrapper.ts: Added MULTI-LINE hint to welcome message Agents now receive clear instructions about using <<< ... >>> for multi-line messages with blank lines or code blocks.
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Implements unambiguous multi-line message parsing using fence markers.
The new syntax allows agents to send messages with blank lines, code
blocks, and complex formatting without truncation:
->relay:Target <<<
Multi-line content here.
Can include blank lines.
Fixes the fundamental issue where multi-line messages with complete
line breaks would get cut off after the first line.