feat(api): Expose all config sections to pub API
docs(api): Update comments
test(api): Cover non-initConfig key read/write
refactor(kill): Split into pub and configurable priv
feat(event): Emit grunt-horde:kill
feat(event): Add mode arg to #kill event payload
fix(api): Guard #configuredKill from invalid keys
test(api): Add #createModuleContext coverage
docs(module): Update example keys, event notes
chore(pkg): Bump version