feat: publish Sandwich Hime tooling preview

Publish the exact sanitized Agent Skill and VS Code preview source tree with independent license boundaries, deterministic provenance manifests, and no private development history. Material design and implementation assistance was provided by OpenAI Codex.

Signed-off-by: Cole Speelman <crspeelman@gmail.com>

editors/vscode/snippets/sando.json

@@ -0,0 +1,11 @@
+{
+  "Sando component file": {
+    "prefix": "sando-component",
+    "body": ["<?sando go", "package ${1:views}", "func ${2:Component}(${3:})", "?>", "${0}"],
+    "description": "Declare one typed Sandwich Hime component"
+  },
+  "Escaped expression": {"prefix": "sando-expression", "body": ["<?= ${1:value} ?>"], "description": "Render contextually escaped output"},
+  "Conditional region": {"prefix": "sando-if", "body": ["<? if ${1:condition} { ?>", "\t${0}", "<? } ?>"], "description": "Conditionally render HTML at content boundaries"},
+  "Loop region": {"prefix": "sando-for", "body": ["<? for _, ${1:item} := range ${2:items} { ?>", "\t${0}", "<? } ?>"], "description": "Render a Go loop at content boundaries"},
+  "Nested component": {"prefix": "sando-nest", "body": ["<?~ ${1:Component}(${2:}) ?>"], "description": "Compose a typed component"}
+}