v8.6.1-dev.9

• Merge pull request #1611 from sgaluza/sergey/ccs-3-glmt-thinking-signature-obekt-vmesto-stroki-lomaet-strim
• Merge remote-tracking branch 'origin/dev' into kai/review/pr-1611-thinking-signature
• test(glmt): align thinking signature coverage
• fix(glmt): emit thinking signature as opaque string
• test(glmt): assert thinking signature is a non-empty opaque string