Absorbs the cache size management and LRU eviction work (#55). All four textual conflicts resolved in favor of main's implementation, with this branch's mechanical lint conformance re-applied on top: - internal/config/config.go: took main's cache_max_bytes wiring (CacheMaxBytes, cacheMaxBytesExplicit) verbatim and expressed the key through this branch's constant convention as keyCacheMaxBytes. - internal/imgcache/cache.go: took main's disabled-cache guards, LRU touch on lookup, and variant_content size accounting verbatim; re-applied this branch's signature wrapping for lll. - internal/imgcache/storage.go: took main's new writeIfAbsent helper and its temp-file cleanup defer verbatim. The auto-merge had silently dropped that defer in favor of this branch's inline cleanup form; restored so the cleanup semantics that arrived from main are intact. - TODO.md: kept both sides' Completed Steps entries. .golangci.yml resolves to this branch's canonical version (sha256 021cc83f4e6fc7c31b95b34b846723dfcf20b66b7baeea1dc40406e643346bcb). make build and make test are green; #55's code is not yet conformant with the canonical lint config, which the following commits address.
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