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Feat/analyze image bloat - #39
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- Add `dbuild analyze` (alias `audit`) to inspect container images for layer size distribution, large layers, and "zombie cleanup" layers (standalone RUN rm/pkg clean instructions that fail to reclaim parent layer space). - Run lightweight in-container rootfs probe using standard FreeBSD base utilities to audit leftover build toolchains/compilers (llvm, gcc, rust, go, cmake), static library archives (*.a), development headers (/usr/local/include), documentation/manuals, and leftover package caches. - Provide actionable optimization recommendations and potential recoverable space. - Support `--json` output with suppressed log statements for clean piping to jq/CI. - Add Containerfile lint rules to warn on uncleaned `pkg install` and standalone cleanup layers. - Add full unit test suite (15 new tests in test_analyze.py and 3 in test_lint.py) and update man page.
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