feat(shots): before/after PR evidence kit (stylegallery shots --before/--after)

Capture 390/1440 x light/dark (x focus/hover) for two revisions, diff each pair in Chromium, and write PNGs, an image-diff-compatible report.json, and pr-body.md. Add the Before/After PR Evidence doc with a PR body template, README/CLI help, search-eval questions, and a self-test run in the compiler workflow.

Author: iyen

.github/workflows/compiler.yml

@@ -25,3 +25,7 @@ jobs:
           bun-version: 1.3.14
       - run: bun install --frozen-lockfile --ignore-scripts
       - run: bun run test:compiler
+      - name: Install Playwright Chromium for shots before/after
+        run: bunx playwright install --with-deps chromium
+      - name: shots before/after self-test
+        run: bun run test:shots

README.md

@@ -149,6 +149,12 @@ Connect your agents:
 
 Site compilation (requires `SG_COMPILER_ROOT`): `compile`, `timeline`, `transcribe`, `sale`, `gate`, `build`, `shots`, `probe`, `workflow`. Start with `stylegallery workflow`.
 
+Before/after PR evidence (local Chromium, no compiler):
+
+| Command | Options | Purpose |
+| --- | --- | --- |
+| `shots --before <ref\|url> --after <ref\|url>` | `--page <path>` (default `index.html`), `--out <dir>` (default `stylegallery-shots-compare` in the system temp directory), `--selector <css>`, `--threshold <0-1>` (default 0.05), `--full-page`, `--wait <ms>`, `--violations <ids>` | Capture 390 and 1440 widths x light/dark (x focus/hover with `--selector`) for a Git ref, `.` (working tree), or URL on each side; write before/after/diff PNGs, `report.json` with visual-qa `image-diff` fields, and `pr-body.md` ([Before/After PR Evidence](quality/evidence/before-after-pr-evidence.md)) |
+
 Other: `help` / `--help`, `version` / `--version`. The MCP server `stylegallery-mcp` exposes `search` and `read` with the same JSON, plus the governed and compiler tools.
 
 ### Worked homepage example

consumer-reference/agent-native/v2/admission-policy.json

@@ -819,6 +819,11 @@
       "domain": "shared",
       "lifecycle": "stable"
     },
+    {
+      "repository_path": "quality/evidence/before-after-pr-evidence.md",
+      "domain": "shared",
+      "lifecycle": "stable"
+    },
     {
       "repository_path": "quality/evidence/consumer-migration.md",
       "domain": "shared",
@@ -1052,5 +1057,5 @@
       "code": "material_path_internal_excluded"
     }
   ],
-  "version_id": "sg:policy/material-admission-v2@sha256:d79b48891e97d9b0b1a3fae919f6e0f91e2e1d5ba1bc5eafe1397067c9064c1a"
+  "version_id": "sg:policy/material-admission-v2@sha256:c8ca1c261338a7d690247e219d7a907cd6f0a7a32516e8571535c01edb549645"
 }

consumer-reference/agent-native/v2/material-registry.json

@@ -13,8 +13,8 @@
     "media_type": { "const": "text/markdown" },
     "allowed_materials": {
       "type": "array",
-      "minItems": 194,
-      "maxItems": 194,
+      "minItems": 195,
+      "maxItems": 195,
       "items": {
         "type": "object",
         "additionalProperties": false,

consumer-reference/agent-native/v2/schema/admission-policy.schema.json

@@ -669,6 +669,10 @@
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   },
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   },
   "quality/evidence/index.md": {
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   "quality/evidence/pattern-contract-audit.md": {
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@@ -710,8 +714,8 @@
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   },
   "quality/evidence/visual-qa.md": {
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   },
   "quality/gates/accessibility-evidence.md": {
    "text_sha256": "a8260828b96931d685ac419162b00a9b4e14e6a919bbd6425eaffb97f5ac1da8",

consumer-reference/agent-native/v2/search-embeddings.json

@@ -94,8 +94,8 @@
         "scripts/test-lifecycle-disposition.mjs",
         "scripts/validate-lifecycle-disposition.mjs"
       ],
-      "scanned_file_count": 627,
-      "scanned_paths_content_id": "sha256:80e3c04037f9d663a6df7393164a429033545ba77d62424bd097a45ac4f80204"
+      "scanned_file_count": 630,
+      "scanned_paths_content_id": "sha256:5372053393a66e3ef55237ff39fb579e941c38b65b2d28eb1a568c2ff1aa09c0"
     },
     "implementation": {
       "path": "scripts/agent-native/v2/extensions/a2a-projection.mjs",
@@ -145,13 +145,13 @@
         "role": "repository_reference",
         "lines": {
           "start": 1,
-          "end": 370
+          "end": 373
         },
-        "file_sha256": "a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2",
-        "content_id": "sha256:a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2",
+        "file_sha256": "a6ea4d689a995c8c65772d98e381b442badf2819eb32c83d00c4c6660e21e8ec",
+        "content_id": "sha256:a6ea4d689a995c8c65772d98e381b442badf2819eb32c83d00c4c6660e21e8ec",
         "reference_lines": [
-          244,
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+          245,
+          261
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         "reference_kinds": [
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@@ -281,8 +281,8 @@
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-        "file_sha256": "13ca8054c2ba781bf57b94760e647e8ecd5c8565bac1313902b36654c3c13f11",
-        "content_id": "sha256:13ca8054c2ba781bf57b94760e647e8ecd5c8565bac1313902b36654c3c13f11",
+        "file_sha256": "1a3ac4dd22ac0875f8206de0b7aefb12f9433d0f6ab7b43f61a831a07328034c",
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@@ -391,8 +391,8 @@
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-        "content_id": "sha256:13ca8054c2ba781bf57b94760e647e8ecd5c8565bac1313902b36654c3c13f11"
+        "file_sha256": "1a3ac4dd22ac0875f8206de0b7aefb12f9433d0f6ab7b43f61a831a07328034c",
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       }
     ],
     "docs_and_registry": [
@@ -432,10 +432,10 @@
       "role": "installed_package_exposure",
       "lines": {
         "start": 1,
-        "end": 370
+        "end": 373
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-      "file_sha256": "a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2",
-      "content_id": "sha256:a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2"
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     },
     "forwarding": {
       "path": "scripts/agent-native/a2a-projection.mjs",

consumer-reference/policies/lifecycle-a2a-extension.json

@@ -94,8 +94,8 @@
         "scripts/test-lifecycle-disposition.mjs",
         "scripts/validate-lifecycle-disposition.mjs"
       ],
-      "scanned_file_count": 627,
-      "scanned_paths_content_id": "sha256:80e3c04037f9d663a6df7393164a429033545ba77d62424bd097a45ac4f80204"
+      "scanned_file_count": 630,
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     },
     "implementation": {
       "path": "scripts/agent-native/v2/extensions/agui-projection.mjs",
@@ -203,13 +203,13 @@
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-        "file_sha256": "a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2",
-        "content_id": "sha256:a1c91fbfa65dd2e4414221bd62b08cc828a7b7b040bf74b93af4014629a8f6d2",
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@@ -329,8 +329,8 @@
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@@ -479,10 +479,10 @@
       "role": "installed_package_exposure",
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     "forwarding": {
       "path": "scripts/agent-native/agui-projection.mjs",

consumer-reference/policies/lifecycle-ag-ui-extension.json

@@ -818,6 +818,28 @@
         "quality/audit/README.md": 3
       }
     },
+    {
+      "id": "q63",
+      "lang": "en",
+      "kind": "real",
+      "must_pass": true,
+      "query": "How do I add before and after screenshots to a pull request?",
+      "qrels": {
+        "quality/evidence/before-after-pr-evidence.md": 3,
+        "quality/evidence/visual-qa.md": 1
+      }
+    },
+    {
+      "id": "q64",
+      "lang": "en",
+      "kind": "real",
+      "must_pass": false,
+      "query": "pixel diff ratio between two git revisions of a page",
+      "qrels": {
+        "quality/evidence/before-after-pr-evidence.md": 3,
+        "quality/evidence/visual-qa.md": 1
+      }
+    },
     {
       "id": "h01",
       "lang": "en",
@@ -1191,6 +1213,16 @@
       "qrels": {
         "quality/audit/README.md": 3
       }
+    },
+    {
+      "id": "m22",
+      "lang": "en",
+      "kind": "mismatch",
+      "must_pass": false,
+      "query": "show reviewers what my page looked like earlier versus now",
+      "qrels": {
+        "quality/evidence/before-after-pr-evidence.md": 3
+      }
     }
   ]
 }

eval/search/questions.json

@@ -211,6 +211,7 @@
     "quality/claim-records/stylegallery-multidomain-scope.md",
     "quality/claims.md",
     "quality/evidence/accessibility.md",
+    "quality/evidence/before-after-pr-evidence.md",
     "quality/evidence/consumer-migration.md",
     "quality/evidence/design-rationale.md",
     "quality/evidence/executable-evidence.md",
@@ -287,6 +288,7 @@
     "scripts/sg-mcp.mjs",
     "scripts/sg-server.mjs",
     "scripts/sg.mjs",
+    "scripts/shots-compare.mjs",
     "scripts/strict-json.mjs",
     "scripts/stylegallery-audit.mjs",
     "scripts/stylegallery-cli.mjs",
@@ -339,6 +341,7 @@
     "test:showcase:self": "node scripts/test-check-showcase.mjs",
     "showcase:serve": "node scripts/serve-showcase.mjs",
     "test:compiler": "node --test scripts/test-sg-compiler.mjs",
+    "test:shots": "node --test scripts/test-shots-compare.mjs",
     "sg:v1": "node scripts/sg.mjs",
     "sg:mcp:v1": "node scripts/sg-mcp.mjs",
     "stylegallery": "node scripts/sg-entry.mjs",