docs: enumerate exploratory truncation postulates in docs/proof-debt.md #289

Job	Run time
governance / Guix primary / Nix fallback policy	41s
governance / Workflow security linter	3s
governance / Language / package anti-pattern policy	34s
governance / Code quality + docs	32s
governance / Licence consistency	35s
governance / Well-Known (RFC 9116 + RSR)	3s
governance / Security policy checks	39s
governance / Trusted-base reduction policy	24s
governance / Validate Hypatia baseline	44s
	4m 15s

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