The --block flag makes poc-agent read block until a complete response
is received (detected by a new user input line starting with '>'),
then exit. This enables smoother three-way conversations where one
instance can wait for the other's complete response without polling.
The implementation:
- Added cmd_read_inner() with block parameter
- Modified socket streaming to detect '>' lines as response boundaries
- Added --block CLI flag to Read subcommand
The --follow flag continues to stream indefinitely.
The --block flag reads one complete response and exits.
Neither flag exits immediately if there's no new output.
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