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PR Review: Update Docker dependency to moby modules

• Phase 1: Static analysis (build, vet, mod tidy)
• Phase 2: Code review of changed files
• Phase 3: Post review feedback

Phase 1: Static Analysis

All three checks pass cleanly:

• go build ./... — compiles successfully
• go vet ./... — no issues found
• go mod tidy — no diff, dependencies are consistent

Phase 2: Code Review

Overall: This is a clean, well-executed migration from the deprecated docker/docker package to the redesigned moby/moby/client and moby/moby/api modules. All call sites are updated consistently, the code compiles, and no stale docker/docker imports remain in the source.

One item to verify

API version negotiation (see inline comment): The old code explicitly called client.WithAPIVersionNegotiation() to prevent "client version too new" errors against older Docker daemons. The new client.New(client.FromEnv) drops this. Based on the moby/moby redesign, negotiation should now be the default — but it would be good to confirm this, since a regression here would silently break users on older Docker engines.

Minor observations

• go.mod replace directive (inline): The indirect docker/docker v28.3.2 vs replace target moby/moby v28.5.2 version mismatch is functionally fine (replace wins), but could confuse future readers.
• ContainerList → .Items: The new ContainerListResult wrapper is correctly unwrapped via .Items in snapshotDocker.go:102.
• Return value handling: ContainerStart, ContainerRemove, and ImageTag now return result structs — all correctly handled with _, err =.
• No remaining old imports: Verified with grep — zero docker/docker imports remain in cmd/ or internal/.

Phase 3: What's done well

• Consistent migration: All three client-creation sites (docker.go, snapshotDocker.go, digest.go) are updated identically to the new client.New(client.FromEnv) pattern.
• Clean dependency graph: Unused transitive deps (moby/sys/sequential, morikuni/aec, Azure/go-ansiterm, etc.) are properly pruned from go.sum.
• README improvements: The grammar fix, trailing whitespace cleanup, and added badges are nice touches bundled appropriately.
• Minimal diff: The PR changes only what needs to change — no unnecessary refactoring.