fix(adapter-utils): consume a line continuation inside a quoted header value

A backslash-newline continuation inside a double-quoted header argument
ended the quoted match, so the unquoted fallback redacted only the part of
the credential before the continuation. The double-quoted branch now treats
the continuation as part of the value, with LF and CRLF line endings.

Claude-Session: https://claude.ai/code/session_01RYigf3eMFJjey9iKRApPGE

packages/adapter-utils/src/command-redaction.test.ts

@@ -286,6 +286,20 @@ describe("redactCommandText header secrets", () => {
     );
   });
 
+  it("redacts across a backslash-newline continuation inside a double-quoted value", () => {
+    // A shell line continuation inside double quotes is part of the argument.
+    const input = 'curl -H "X-API-Key: abc\\\ndef" https://example.test';
+    const output = redactCommandText(input);
+    expect(output).not.toContain("def");
+    expect(output).toBe(
+      `curl -H "X-API-Key: ${REDACTED_COMMAND_TEXT_VALUE}" https://example.test`,
+    );
+    const crlf = 'curl -H "X-API-Key: abc\\\r\ndef" https://example.test';
+    expect(redactCommandText(crlf)).toBe(
+      `curl -H "X-API-Key: ${REDACTED_COMMAND_TEXT_VALUE}" https://example.test`,
+    );
+  });
+
   it("redacts a backslash inside a single-quoted header value", () => {
     // A shell single quote has no escapes, so the backslash is part of the value.
     const input = String.raw`curl -H 'X-API-Key: abc\def' https://example.test`;

packages/adapter-utils/src/command-redaction.ts

@@ -47,7 +47,8 @@ const COMMAND_AUTHORIZATION_BEARER_RE =
 //
 // Each branch treats the backslash the way its quoting context does. A
 // double-quoted value consumes escape pairs, so an escaped quote inside the
-// argument (`"X-API-Key: abc\"def"`) does not end the value early. Its opening
+// argument (`"X-API-Key: abc\"def"`) does not end the value early, and neither
+// does a backslash-newline line continuation. Its opening
 // quote must itself be unescaped, which keeps the branch off a serialized
 // diagnostic such as `\"X-API-Key: ...\"`, where the closing `\"` must survive.
 // A single-quoted value takes a backslash literally, because a shell single
@@ -95,7 +96,7 @@ const COMMAND_SECRET_HEADER_UNQUOTED_VALUE_PATTERN =
   "`" +
   String.raw`]+)`;
 const COMMAND_SECRET_HEADER_RE = new RegExp(
-  String.raw`(?<!\\)("${COMMAND_SECRET_HEADER_PREFIX_PATTERN})(?:\\.|[^\s"\\])(?:\\.|[^"\\\r\n])*(")` +
+  String.raw`(?<!\\)("${COMMAND_SECRET_HEADER_PREFIX_PATTERN})(?:\\.|[^\s"\\])(?:\\\r?\n|\\.|[^"\\\r\n])*(")` +
     String.raw`|('${COMMAND_SECRET_HEADER_PREFIX_PATTERN})[^\s'][^'\r\n]*(')` +
     String.raw`|(\b${COMMAND_SECRET_HEADER_PREFIX_PATTERN})${COMMAND_SECRET_HEADER_UNQUOTED_VALUE_PATTERN}`,
   "gi",