Feat: Add new skill for setting up repo for development

Author: sampajano

skills/repo-tools/SKILL.md

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+---
+name: net-http-tools
+description: Tools for interacting with the google/net_http repository.
+---
+
+# Net HTTP Tools
+
+This skill contains utilities for working with the `google/net_http` repository.
+
+## Capabilities
+
+### 1. Setup
+
+Sets up the repository in your local environment.
+
+**Goal:**
+
+The `google/net_http` repository is successfully set up on the local machine when:
+1.  The `gh` CLI is installed and authenticated.
+2.  The repository is cloned into `~/github/net_http`.
+3.  The `origin` remote points to the user's fork.
+4.  The `upstream` remote points to `https://github.com/google/net_http`.
+
+**Instructions:**
+
+(Skip these steps if the Goal is already met)
+
+1.  **Check for GitHub CLI (`gh`)**
+    Check if `gh` is installed.
+    ```bash
+    which gh
+    ```
+
+2.  **Install GitHub CLI (if missing)**
+    If `gh` is **NOT** installed, **STOP** and ask the user to run the following
+    commands manually.
+    **The agent should not run these commands.**
+    ```bash
+    sudo glinux-add-repo -c github-cli stable && \
+    sudo apt update && \
+    sudo apt install gh
+    ```
+
+3.  **Authenticate GitHub CLI**
+    Once `gh` is installed, ensure you are authenticated.
+    ```bash
+    gh auth login
+    ```
+
+4.  **Create Directory**
+    Ensure the `~/github` directory exists.
+    ```bash
+    mkdir -p ~/github
+    ```
+
+5.  **Fork Repository**
+    Ask the user to fork `https://github.com/google/net_http` if they haven't
+    already.
+    Then, ask the user for the URL of their personal fork (e.g.,
+    `https://github.com/USERNAME/net_http`).
+
+6.  **Clone Fork**
+    Clone the user's fork into `~/github/net_http`.
+    Replace `<USER_FORK_URL>` with the URL provided by the user.
+    ```bash
+    gh repo clone <USER_FORK_URL> ~/github/net_http
+    ```
+
+7.  **Add Upstream Remote**
+    Navigate to the repository and add the upstream remote.
+    ```bash
+    cd ~/github/net_http
+    git remote add upstream https://github.com/google/net_http
+    git remote -v
+    ```
+
+### 2. Sync Main
+
+Syncs the local `main` branch with the `upstream` repository.
+
+**Goal:**
+
+The local `main` branch is up-to-date with `upstream/main`.
+
+**Instructions:**
+
+1.  **Sync Main Branch**
+    Run the following command to sync `main`. If the local `main` has diverged
+    from `upstream/main`, it will be renamed to `main_backup_<timestamp>` and
+    reset to match upstream.
+    ```bash
+    cd ~/github/net_http
+    git remote prune origin && git remote update && git checkout main
+
+    if [ "$(git rev-list --count upstream/main..main)" -gt 0 ]; then
+      BACKUP="main_backup_$(date +%Y%m%d_%H%M)"
+      echo "Local main has diverged. Renaming to $BACKUP and resetting to upstream/main."
+      git branch -m "$BACKUP"
+      git checkout -b main upstream/main
+      git push -u origin main --force-with-lease
+    else
+      git pull upstream main
+      git push -u origin main
+    fi
+    ```

skills/repo-tools/g3doc/README.md

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+# Net HTTP Tools Skill
+
+Follow these steps to install this skill to your user directory (run from
+`google3`):
+
+**Step 1: Install using the following command**
+
+```bash
+mkdir -p "../configs/users/$USER/_agents/skills/" && \
+cp -r "../configs/users/eryu/_agents/skills/net-http-tools" \
+  "../configs/users/$USER/_agents/skills/"
+```
+
+**Step 2: Submit the changes**
+
+Snapshot and submit your changes to make the skill available.