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Add an Appendix E incident retrodiction harness #6515

Job	Run time
changes	12s
node-forward-compatibility	5m 14s
node-minimum-compatibility	4m 11s
stage2c (installed 0)	1m 11s
stage2c (mutants 0)	7m 51s
stage2c (e2e 2)	3m 24s
kernel-static-checks	10m 22s
windows-powershell	4m 28s
stage2c (e2e 1)	6m 1s
test-shard (1)	13m 5s
dashboard-acceptance	3m 1s
test-shard (4)	10m 48s
test-shard (2)	13m 25s
test-shard (3)	8m 24s
presentation	0s
checks	4s
pytest	1m 4s
sonar / SonarCloud analysis (non-blocking)	5s
stage2c-correctness-e2e	4s
merge-gate	10s
	1h 33m 4s