Add --json/-j to most get/list commands bump to Go 1.26

Changelog for 0.18.9:

• PR #1026 Add --json/-j to most get/list commands by @alexellis

Commits
4635619 Bump GHA actions versions by @alexellis
20b4106 Bump Go to 1.26 and add AGENTS.md by @alexellis
6d47ba4 fix: gofmt alignment in secret_generate.go by @alexellis
cf69b70 Add alias for secret gen and fix for redirection to file by @alexellis
03bc33c Add --json/-j to most get/list commands by @alexellis
45e2f19 Mention --tag=digest for publish command by @alexellis

Changes: 0.18.8...0.18.9

Generated by Derek