IRIS runner: add default app/firmware fallbacks and path probing (no logic changes) #182

Job	Run time
qcom-preflight-checks / commit-emails-check	4s
qcom-preflight-checks / semgrep/ci	1m 53s
qcom-preflight-checks / copyright-license-check	55s
qcom-preflight-checks / dependency-review	5s
qcom-preflight-checks / repolinter	31s
	3m 28s

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