Include environment changes and evict reverse dependents

Review the independently proposed patch below, including its unchanged callers. Changing a recipe environment must change its signature. Cleaning a target must also evict all transitive dependents even when their produced content could be reconstructed identically.

Review focus: Content-addressed build caching

src/domain/environment.py

BeforeProposed

+1−1

55def signature(target):

6 return {}

6 return target['env']

99def expand(value, environment):

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