Map conversation outcomes to run statuses

[chubes4]

Summary

• Add a generic WP_Agent_Run_Outcome helper for core-safe run outcome constants, normalization, and run-control status mapping.
• Finalize conversation-loop and chat-dispatch run control with explicit statuses for runtime-tool pending, approval-required, budget-exceeded, stalled, failed, interrupted, and completed outcomes.
• Keep run-control storage on the existing options-backed primitives and add targeted smoke coverage for the full status matrix.

Testing

• php tests/run-outcome-status-smoke.php
• php tests/chat-run-control-smoke.php
• php tests/conversation-loop-budgets-smoke.php
• php tests/pre-execute-approval-smoke.php
• composer test
• composer phpstan

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted the implementation, smoke coverage, and verification steps; Chris remains responsible for review and merge.