Apply Go 1.26.1 coding standards via go fix

[Copilot]

Run go fix ./... to apply all Go 1.26.1 idiomatic transformations across the codebase.

• Deprecated io/ioutil removal (files/reader.go, files/writer.go): ioutil.ReadFile / ioutil.WriteFile → os.ReadFile / os.WriteFile
• slices package adoption (files/glob.go): sort.Slice → slices.Sort; manual containment loop → slices.Contains
• Iterator usage (parser/parser.go): for _, line := range strings.Split(...) → for line := range strings.SplitSeq(...) in Show, Latest, LatestAny — avoids intermediate slice allocation

// Before
for _, line := range strings.Split(doc, "\n") { ... }

// After
for line := range strings.SplitSeq(doc, "\n") { ... }

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• get.anchore.io
  • Triggering command: /usr/bin/curl curl -w %{http_code} -sL -o /tmp/tmp.YLLerNsPIR REDACTED -gensymabis -o /tmp/go-build1384428979/b005/symabis /opt/hostedtoolcache/go/1.24.13/x64/src/internal/abi/abi_test.s /opt/hostedtoolcache/go/1.24.13/x64/src/internal/abi/stub.s -###�� -x c rg/toolchain@v0.0.1-go1.26.1.linux-amd64/pkg/tool/linux_amd64/asm - x l/linux_amd64/fi/tmp/go-build1384428979/b011/_pkg_.a rg/toolchain@v0.-trimpath (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.