feat(vscode-bridge): Copilot Chat bridge (OpenAI facade + JSON-RPC tools)

- Implements VS Code extension per AGENTS.md specification
- OpenAI-style HTTP facade: POST /v1/chat/completions (SSE), GET /v1/models, GET /healthz
- JSON-RPC WebSocket server with methods: mcp.fs.read/list, mcp.search.code, mcp.symbols.list, mcp.edit.applyPatch, mcp.format.apply, mcp.imports.organize
- Copilot Chat integration via vscode.chat.requestChatAccess('copilot')
- Commands: bridge.enable/disable/status with status bar indicator
- Security: localhost-only binding, optional bearer token, read-only by default
- Policy enforcement via optional .agent-policy.yaml
- Ephemeral port management with globalState persistence

Co-Authored-By: Lars Baunwall <larslb@thinkability.dk>

vscode-bridge/node_modules/yaml/dist/stringify/stringifyDocument.js

@@ -0,0 +1,87 @@
+'use strict';
+
+var identity = require('../nodes/identity.js');
+var stringify = require('./stringify.js');
+var stringifyComment = require('./stringifyComment.js');
+
+function stringifyDocument(doc, options) {
+    const lines = [];
+    let hasDirectives = options.directives === true;
+    if (options.directives !== false && doc.directives) {
+        const dir = doc.directives.toString(doc);
+        if (dir) {
+            lines.push(dir);
+            hasDirectives = true;
+        }
+        else if (doc.directives.docStart)
+            hasDirectives = true;
+    }
+    if (hasDirectives)
+        lines.push('---');
+    const ctx = stringify.createStringifyContext(doc, options);
+    const { commentString } = ctx.options;
+    if (doc.commentBefore) {
+        if (lines.length !== 1)
+            lines.unshift('');
+        const cs = commentString(doc.commentBefore);
+        lines.unshift(stringifyComment.indentComment(cs, ''));
+    }
+    let chompKeep = false;
+    let contentComment = null;
+    if (doc.contents) {
+        if (identity.isNode(doc.contents)) {
+            if (doc.contents.spaceBefore && hasDirectives)
+                lines.push('');
+            if (doc.contents.commentBefore) {
+                const cs = commentString(doc.contents.commentBefore);
+                lines.push(stringifyComment.indentComment(cs, ''));
+            }
+            // top-level block scalars need to be indented if followed by a comment
+            ctx.forceBlockIndent = !!doc.comment;
+            contentComment = doc.contents.comment;
+        }
+        const onChompKeep = contentComment ? undefined : () => (chompKeep = true);
+        let body = stringify.stringify(doc.contents, ctx, () => (contentComment = null), onChompKeep);
+        if (contentComment)
+            body += stringifyComment.lineComment(body, '', commentString(contentComment));
+        if ((body[0] === '|' || body[0] === '>') &&
+            lines[lines.length - 1] === '---') {
+            // Top-level block scalars with a preceding doc marker ought to use the
+            // same line for their header.
+            lines[lines.length - 1] = `--- ${body}`;
+        }
+        else
+            lines.push(body);
+    }
+    else {
+        lines.push(stringify.stringify(doc.contents, ctx));
+    }
+    if (doc.directives?.docEnd) {
+        if (doc.comment) {
+            const cs = commentString(doc.comment);
+            if (cs.includes('\n')) {
+                lines.push('...');
+                lines.push(stringifyComment.indentComment(cs, ''));
+            }
+            else {
+                lines.push(`... ${cs}`);
+            }
+        }
+        else {
+            lines.push('...');
+        }
+    }
+    else {
+        let dc = doc.comment;
+        if (dc && chompKeep)
+            dc = dc.replace(/^\n+/, '');
+        if (dc) {
+            if ((!chompKeep || contentComment) && lines[lines.length - 1] !== '')
+                lines.push('');
+            lines.push(stringifyComment.indentComment(commentString(dc), ''));
+        }
+    }
+    return lines.join('\n') + '\n';
+}
+
+exports.stringifyDocument = stringifyDocument;