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fix: prevent generated dependency cache PRs

#1366

Merged chris wants to merge codex/prevent-generated-pantry-prs into main

16 files +356 -72

a358b785a8 fix(scanner): ignore generated dependency trees Chris review this step
a32cd529a3 fix(git): reject missing update targets Chris review this step
37942484e7 fix(pr): render version ranges safely Chris review this step
f027615112 fix(test): isolate temporary working directories Chris review this step
d24f287074 docs: resolve markdown lint violations Chris review this step