A crafted workspace name containing a newline (e.g. "x\nmodel: evil")
could inject arbitrary YAML keys into the auto-generated config.yaml.
Strip \n and \r from the name before interpolation. YAML key injection
requires a newline to start a new mapping entry; other characters such
as `:` are safe in unquoted scalar values.
Adds TestGenerateDefaultConfig_YAMLInjection with three adversarial
inputs: bare \n injection, CRLF injection, and multi-key injection.
Closes#221
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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