maint/build ~ move 'update-dist.succeeded' target to 'build' intermed…

…iate directory

- use 'build' as container for 'succeeded' signals
- keep 'dist' clean of these intermediate build files

package.json

@@ -127,7 +127,7 @@
 		"# update:changelog # update CHANGELOG (using `git changelog ...`)": "",
 		"update:changelog": "run-s --silent _:update:changelog && git diff --quiet --exit-code CHANGELOG.mkd || shx echo \"[update] info CHANGELOG updated\"",
 		"# update:dist # update distribution content": "",
-		"update:dist": "run-s --silent build && exec-if-updated --source \"build/**\" --target \"dist/**\" --target dist/.targets/update-dist.succeeded \"run-s --silent _:update:dist:rebuild\"",
+		"update:dist": "run-s --silent build && exec-if-updated --source \"build/**\" --target \"dist/**\" --target build/.targets/update-dist.succeeded \"run-s --silent _:update:dist:rebuild\"",
 		"## +:... == sub-scripts (may run 'visibly', but not user-facing)": "",
 		"+:coverage": "run-s build test:code && is-ci && run-s cov:send || run-s cov:view",
 		"+:max-node-8": "is-node-not-modern 10",
@@ -151,7 +151,7 @@
 		"_:update:dist.normalizeEOL": "eolConverter lf dist/**/*.{cjs,js,mjs,ts,json}",
 		"_:update:dist.pack": "node -e \"delete process.env.npm_config_dry_run; name=require('./package.json').name; result=require('child_process').spawnSync('npm pack && shx mkdir -p dist && shx mv '+name+'-*.tgz dist/'+name+'.tgz',{shell:true,encoding:'utf-8'}); if (result.status != 0) {console.error('[update] ERR! Unable to package (into *.tgz) for distribution\\n'+result.stdout+'\\n'+result.stderr); process.exit(1);} else {console.log(result.stdout);};\"",
 		"_:update:dist.types": "shx mkdir -p dist && shx rm -fr dist/types && rollup --config .rollup.config.types.js && replace-in-file \"export { _default as default }\" \"export = _default\" dist/types/mod.cjs.d.ts --quiet && shx mkdir -p dist/cjs && shx cp dist/types/*.cjs.d.ts dist/cjs",
-		"_:update:dist:rebuild": "shx rm -fr dist && run-s --silent _:update:dist.build _:update:dist.types _:update:dist.normalizeEOL _:update:dist.pack && shx mkdir -p dist/.targets && shx touch dist/.targets/update-dist.succeeded",
+		"_:update:dist:rebuild": "shx rm -fr dist && run-s --silent _:update:dist.build _:update:dist.types _:update:dist.normalizeEOL _:update:dist.pack && shx mkdir -p dist/.targets && shx touch build/.targets/update-dist.succeeded",
 		"_:version:spell:changelog_update": "run-s --silent _:exists:git-changelog && git changelog -u | cspell stdin --config \".vscode/cspell.json\" || shx echo \"[lint] WARN CHANGELOG update `cspell` exception\" 1>&2",
 		"_:version:update:changelog": "run-s --silent _:exists:git-changelog && node -e \"v=require('./package.json').version; result=require('child_process').spawnSync('git changelog --next-tag-now --next-tag v'+v,{shell:true,encoding:'utf-8'}); if (result.status != 0) {console.error('ERR! '+result.stderr); process.exit(1);} else {require('fs').writeFileSync('CHANGELOG.mkd',result.stdout);};\" || shx echo \"[version] WARN CHANGELOG not updated\" 1>&2",
 		"## npm lifecycle scripts ##": "",