feat: Add REST API method support for assign_to_agent #22258

Job	Run time
lint	1m 4s
test	1m 34s
js	1m 3s
build	1m 27s
fuzz	1m 58s
Integration: CLI MCP Gateway	48s
bench	38s
Integration: CLI Logs & Firewall	34s
Integration: CLI MCP Other	48s
Integration: Workflow	1m 9s
Integration: CLI Compile & Poutine	57s
logs-token-check	50s
Integration: CLI MCP Playwright	2m 1s
Security Scan: actionlint	28s
Security Scan: zizmor	31s
Security Scan: poutine	35s
	16m 25s

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