chore(main): release agent-engine 0.5.0

[github-actions]

🤖 I have created a release beep boop

0.5.0 (2026-08-04)

Features

• expose manager playground route (82c405f)

Bug Fixes

• api: sanitize raw tool exception text to generic error in ToolRecord (4959cfc)
• api: sanitize raw tool exception text to generic error in ToolRecord (24cd005)
• cli: validate config before serving (b172b1a)
• cli: validate config before serving (5f1442f)
• generate: report unreferenced tools (2581c0e)
• generate: report unreferenced tools (cc80456)
• logging: align uvicorn/third-party logs with structured formatter (90711ab)
• logging: make configure_logging own the root handler unconditionally (861c60f)
• parser: reject unknown and misplaced YAML keys during spec validation (016f89d)
• parser: reject unknown and misplaced YAML keys during spec validation (c981c57)
• widget: avoid crypto.randomUUID crash outside secure contexts (46a98ce)
• widget: avoid crypto.randomUUID crash outside secure contexts (da666bc)
• widget: hide internal tool provider labels (5166956)
• widget: hide tool provider labels (3a5f3a2)

Performance Improvements

• parser: optimize _validate_unknown_keys loop (d821d6b)

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