chore: import upstream snapshot with attribution

.github/scripts/mention/gh-get-review-threads.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Get PR review threads with comments via GitHub GraphQL API
+#
+# Usage:
+#   gh-get-review-threads.sh [FILTER]
+#
+# Arguments:
+#   FILTER - Optional: filter for unresolved threads from specific author
+#
+# Environment (set by composite action):
+#   MENTION_REPO      - Repository (owner/repo format)
+#   MENTION_PR_NUMBER - Pull request number
+#   GITHUB_TOKEN      - GitHub API token
+#
+# Output:
+#   JSON array of review threads with nested comments
+
+# Parse OWNER and REPO from MENTION_REPO
+REPO_FULL="${MENTION_REPO:?MENTION_REPO environment variable is required}"
+OWNER="${REPO_FULL%/*}"
+REPO="${REPO_FULL#*/}"
+PR_NUMBER="${MENTION_PR_NUMBER:?MENTION_PR_NUMBER environment variable is required}"
+FILTER="${1:-}"
+
+gh api graphql -f query='
+  query($owner: String!, $repo: String!, $prNumber: Int!) {
+    repository(owner: $owner, name: $repo) {
+      pullRequest(number: $prNumber) {
+        reviewThreads(first: 100) {
+          nodes {
+            id
+            isResolved
+            isOutdated
+            path
+            line
+            comments(first: 50) {
+              nodes {
+                id
+                body
+                author { login }
+                createdAt
+              }
+            }
+          }
+        }
+      }
+    }
+  }' -F owner="$OWNER" \
+     -F repo="$REPO" \
+     -F prNumber="$PR_NUMBER" \
+     --jq '.data.repository.pullRequest.reviewThreads.nodes' | \
+if [ -n "$FILTER" ]; then
+  jq --arg author "$FILTER" '
+    map(select(
+      .isResolved == false and
+      .comments.nodes | any(.author.login == $author)
+    ))'
+else
+  cat
+fi

.github/scripts/mention/gh-resolve-review-thread.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Resolve a GitHub PR review thread, optionally posting a comment first
+#
+# Usage:
+#   gh-resolve-review-thread.sh THREAD_ID [COMMENT]
+#
+# Arguments:
+#   THREAD_ID - The GraphQL node ID of the review thread to resolve
+#   COMMENT   - Optional: Comment body to post before resolving
+#
+# Environment (set by composite action):
+#   MENTION_REPO      - Repository (owner/repo format)
+#   MENTION_PR_NUMBER - Pull request number
+#   GITHUB_TOKEN      - GitHub API token
+#
+# Behavior:
+#   1. If COMMENT is provided, posts it as a reply to the thread
+#   2. Resolves the thread
+
+# Validate required environment variables
+: "${MENTION_REPO:?MENTION_REPO environment variable is required}"
+: "${MENTION_PR_NUMBER:?MENTION_PR_NUMBER environment variable is required}"
+THREAD_ID="${1:?Thread ID required}"
+COMMENT="${2:-}"
+
+# Step 1: Post comment if provided
+if [ -n "$COMMENT" ]; then
+  echo "Posting comment to thread..." >&2
+  COMMENT_RESULT=$(gh api graphql -f query='
+    mutation($threadId: ID!, $body: String!) {
+      addPullRequestReviewThreadReply(input: {
+        pullRequestReviewThreadId: $threadId,
+        body: $body
+      }) {
+        comment {
+          id
+        }
+      }
+    }' -f threadId="$THREAD_ID" -f body="$COMMENT")
+  if echo "$COMMENT_RESULT" | jq -e '.errors' > /dev/null 2>&1; then
+    echo "Error posting comment: $COMMENT_RESULT" >&2
+    exit 1
+  fi
+fi
+
+# Step 2: Resolve the thread
+echo "Resolving thread..." >&2
+RESOLVE_RESULT=$(gh api graphql -f query='
+  mutation($threadId: ID!) {
+    resolveReviewThread(input: {threadId: $threadId}) {
+      thread {
+        id
+        isResolved
+      }
+    }
+  }' -f threadId="$THREAD_ID" --jq '.data.resolveReviewThread.thread')
+
+echo "$RESOLVE_RESULT"
+echo "✓ Thread resolved" >&2