Add dev_commit.sh helper and no-emoji mandate

wp-includes/blocks/site-tagline/block.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 3,
+	"name": "core/site-tagline",
+	"title": "Site Tagline",
+	"category": "theme",
+	"description": "Describe in a few words what the site is about. The tagline can be used in search results or when sharing on social networks even if it’s not displayed in the theme design.",
+	"keywords": [ "description" ],
+	"textdomain": "default",
+	"attributes": {
+		"textAlign": {
+			"type": "string"
+		},
+		"level": {
+			"type": "number",
+			"default": 0
+		},
+		"levelOptions": {
+			"type": "array",
+			"default": [ 0, 1, 2, 3, 4, 5, 6 ]
+		}
+	},
+	"example": {
+		"viewportWidth": 350,
+		"attributes": {
+			"textAlign": "center"
+		}
+	},
+	"supports": {
+		"align": [ "wide", "full" ],
+		"html": false,
+		"color": {
+			"gradients": true,
+			"__experimentalDefaultControls": {
+				"background": true,
+				"text": true
+			}
+		},
+		"spacing": {
+			"margin": true,
+			"padding": true,
+			"__experimentalDefaultControls": {
+				"margin": false,
+				"padding": false
+			}
+		},
+		"typography": {
+			"fontSize": true,
+			"lineHeight": true,
+			"__experimentalFontFamily": true,
+			"__experimentalTextTransform": true,
+			"__experimentalTextDecoration": true,
+			"__experimentalFontStyle": true,
+			"__experimentalFontWeight": true,
+			"__experimentalLetterSpacing": true,
+			"__experimentalWritingMode": true,
+			"__experimentalDefaultControls": {
+				"fontSize": true
+			}
+		},
+		"interactivity": {
+			"clientNavigation": true
+		},
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true
+		}
+	},
+	"editorStyle": "wp-block-site-tagline-editor",
+	"style": "wp-block-site-tagline"
+}

wp-includes/blocks/site-tagline/editor-rtl.css

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+.wp-block-site-tagline__placeholder{
+  border:1px dashed;
+  padding:1em 0;
+}

wp-includes/blocks/site-tagline/editor-rtl.min.css

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+.wp-block-site-tagline__placeholder{border:1px dashed;padding:1em 0}

wp-includes/blocks/site-tagline/editor.css

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+.wp-block-site-tagline__placeholder{
+  border:1px dashed;
+  padding:1em 0;
+}

wp-includes/blocks/site-tagline/editor.min.css

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+.wp-block-site-tagline__placeholder{border:1px dashed;padding:1em 0}

wp-includes/blocks/site-tagline/style-rtl.css

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+.wp-block-site-tagline{
+  box-sizing:border-box;
+}

wp-includes/blocks/site-tagline/style-rtl.min.css

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+.wp-block-site-tagline{box-sizing:border-box}

wp-includes/blocks/site-tagline/style.css

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+.wp-block-site-tagline{
+  box-sizing:border-box;
+}

wp-includes/blocks/site-tagline/style.min.css

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+.wp-block-site-tagline{box-sizing:border-box}