Updates channel prefixes, log messages, comments, and configuration values
across daemon, mcp-server, and related packages to complete the rebrand from
gsd to sf-run naming.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds scripts/base64-scan.sh and a corresponding CI step to detect
prompt injection payloads that are base64-encoded to evade the existing
docs-prompt-injection-scan.sh check.