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/README.md

@@ -0,0 +1,15 @@
+<!-- SPDX-License-Identifier: AGPL-3.0-only -->
+
+# Sandwich Hime for VS Code — preview
+
+Syntax highlighting always works. In a trusted workspace, this extension uses
+your locally installed Hime-san `v1.0.0-beta.2` for live `.sando` diagnostics,
+hovers, document symbols, typed component completion, and go-to-definition.
+
+It never downloads or upgrades Hime-san, generates on open/save, sends
+telemetry, or makes network requests. Check and Generate are explicit commands;
+the dev supervisor opens in a visible terminal owned by you.
+
+Install the exact compiler/runtime pins documented at
+<https://sandwichhime.com/docs/editor/>, verify the published VSIX checksum,
+then use VS Code's **Extensions: Install from VSIX…** command.