ProseForge Agent v0.4.1

Agent runtime closure hotfix for ordinary users.

Fixed

• pf-agent setup --quick now writes the actual provider profile key names
  used at runtime, including DASHSCOPE_API_KEY, ARK_API_KEY,
  ZHIPU_API_KEY, and XAI_API_KEY.
• Provider resolution now honors .pf-agent/config.yaml model and
  api_key_ref overrides instead of always using bundled profile defaults.
• pf-agent service check now reports missing real provider keys instead of
  claiming every requested provider is configured.
• Agent tool calls such as provider.configure no longer report fake success;
  unavailable tool actions return clear next steps.
• The product TUI no longer prompts configured users to run setup again, and
  placeholder workflow packs are marked as coming soon.
• POSIX installer PATH persistence and PowerShell installer command execution
  are safer and less likely to mislead new terminal sessions.