Add non-automatic TypeScript Style Review agent and skill

This adds the 'gerrit-typescript-style-review' agent to
agent_configs.textproto and creates the corresponding skill with
guidelines for TypeScript style review.

Google-Bug-Id: b/514414488
Release-Notes: skip
Change-Id: I5ba5514ee0f67f6a32d4bfaa9bdc1796d45d3f02

configs/agent_configs.textproto

diff --git a/configs/agent_configs.textproto b/configs/agent_configs.textproto
index cb4119d..08f2602 100644
--- a/configs/agent_configs.textproto
+++ b/configs/agent_configs.textproto
@@ -48,3 +48,17 @@
   }
   automatic: true
 }
+
+# TypeScript Style Review Agent
+configs: {
+  id: "gerrit-typescript-style-review"
+  display_name: "TypeScript Style Review"
+  description: "Checks TypeScript files against style guide, focusing on property visibility and bypasses."
+  skills: "typescript_style_review"
+  include_filters: {
+    project: "gerrit"
+    project: "TestRepo"
+    path_regex: ".*\\.ts$"
+  }
+}
+

configs/skills/typescript_style_review/SKILL.md

diff --git a/configs/skills/typescript_style_review/SKILL.md b/configs/skills/typescript_style_review/SKILL.md
new file mode 100644
index 0000000..d1e79f2
--- /dev/null
+++ b/configs/skills/typescript_style_review/SKILL.md
@@ -0,0 +1,42 @@
+---
+name: typescript-style-review
+description: Reviews TypeScript code against the Google TS Style Guide.
+---
+
+# TypeScript Style Review Guide
+
+## Executive Summary
+
+This guide serves as the instruction set for reviewing TypeScript code. The
+goal is to ensure that all TypeScript code adheres to the official Google
+TypeScript Style Guide.
+
+## Guidelines
+
+You must review the TypeScript files in the changelist and ensure they comply
+with the rules and best practices outlined in the official Google TypeScript
+Style Guide.
+
+### Reference
+*   **Google TypeScript Style Guide**:
+    https://google.github.io/styleguide/tsguide.html
+
+## Review Instructions
+
+When performing the review:
+1.  Identify any violations of the Google TypeScript Style Guide.
+2.  For each violation, provide a clear explanation of the problem, a
+    suggestion for how to fix it (with a code snippet if appropriate), and a
+    reference to the relevant section of the style guide.
+3.  Format your comments using the following template:
+
+### Problem
+Clearly and succinctly describe the style guide violation.
+
+### Suggestion
+Provide a suggestion for improvement, including a code snippet.
+
+### Reference
+Provide the link to the relevant section in the Google TypeScript Style Guide
+(e.g.,
+`https://google.github.io/styleguide/tsguide.html#visibility-of-properties-accessed-from-templates`).