feat(ci): keep Discord forum tags live (re-apply on state/label change via bot)

.github/workflows/discord-discussions.yml

@@ -56,6 +56,7 @@ jobs:
           command -v discord_applied_tags   >/dev/null 2>&1 || discord_applied_tags()   { printf '[]'; }
           command -v extract_discord_thread >/dev/null 2>&1 || extract_discord_thread() { :; }
           command -v discord_archive_thread >/dev/null 2>&1 || discord_archive_thread() { :; }
+          command -v discord_set_tags       >/dev/null 2>&1 || discord_set_tags()       { :; }
 
           NUMBER="${{ github.event.discussion.number }}"
           OWNER="${REPO%/*}"
@@ -340,6 +341,10 @@ jobs:
           FINAL_THREAD_ID="${DISCORD_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${WINNER_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${NEW_THREAD_ID:-}"
+          # Keep forum tags live (open/closed, answered/unanswered, category,
+          # label changes). Webhooks can't edit applied_tags after creation, so
+          # the bot re-applies them each event, before archiving.
+          discord_set_tags "$FINAL_THREAD_ID" "$APPLIED_TAGS"
           if [ "$IS_CLOSED" = "true" ]; then
             discord_archive_thread "$FINAL_THREAD_ID" true
           else

.github/workflows/discord-issues.yml

@@ -54,6 +54,7 @@ jobs:
           command -v discord_applied_tags   >/dev/null 2>&1 || discord_applied_tags()   { printf '[]'; }
           command -v extract_discord_thread >/dev/null 2>&1 || extract_discord_thread() { :; }
           command -v discord_archive_thread >/dev/null 2>&1 || discord_archive_thread() { :; }
+          command -v discord_set_tags       >/dev/null 2>&1 || discord_set_tags()       { :; }
 
           NUMBER="${{ github.event.issue.number }}"
 
@@ -235,6 +236,10 @@ jobs:
           FINAL_THREAD_ID="${DISCORD_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${WINNER_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${NEW_THREAD_ID:-}"
+          # Keep forum tags live (open→closed, label changes). Webhooks can't edit
+          # applied_tags after creation, so the bot re-applies them each event.
+          # Done before archiving, while the thread is still active.
+          discord_set_tags "$FINAL_THREAD_ID" "$APPLIED_TAGS"
           if [ "$STATE" = "open" ]; then
             discord_archive_thread "$FINAL_THREAD_ID" false
           else

.github/workflows/discord-pr.yml

@@ -75,6 +75,7 @@ jobs:
           command -v discord_applied_tags   >/dev/null 2>&1 || discord_applied_tags()   { printf '[]'; }
           command -v extract_discord_thread >/dev/null 2>&1 || extract_discord_thread() { :; }
           command -v discord_archive_thread >/dev/null 2>&1 || discord_archive_thread() { :; }
+          command -v discord_set_tags       >/dev/null 2>&1 || discord_set_tags()       { :; }
 
           # ── Resolve PR number ────────────────────────────────────────────
           if [ "$EVENT_NAME" = "pull_request" ] || [ "$EVENT_NAME" = "pull_request_target" ] || [ "$EVENT_NAME" = "pull_request_review" ]; then
@@ -337,6 +338,10 @@ jobs:
           FINAL_THREAD_ID="${DISCORD_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${WINNER_THREAD_ID:-}"
           [ -z "$FINAL_THREAD_ID" ] && FINAL_THREAD_ID="${NEW_THREAD_ID:-}"
+          # Keep forum tags live (open→closed→merged/draft, label changes).
+          # Webhooks can't edit applied_tags after creation, so the bot re-applies
+          # them each event. Done before archiving, while the thread is still active.
+          discord_set_tags "$FINAL_THREAD_ID" "$APPLIED_TAGS"
           if [ "$PR_STATE" = "open" ]; then
             discord_archive_thread "$FINAL_THREAD_ID" false
           else

.github/workflows/scripts/discord-helper.sh

@@ -168,3 +168,22 @@ discord_archive_thread() {
     -d "{\"archived\": ${archived}}" \
     "https://discord.com/api/v10/channels/${thread_id}" || true
 }
+
+# ── Live forum tag sync ──────────────────────────────────────────────────
+# discord_set_tags <thread_id> <applied_tags_json> — re-apply a forum thread's
+# tags so they track the current state/labels (open→closed→merged, label adds).
+# Webhooks can only set applied_tags at creation, so keeping them live needs a
+# BOT token with Manage Threads/Posts. No-op unless DISCORD_GITHUB_BOT_TOKEN is
+# set, a thread id is known, and the tag list is non-empty (an empty list means
+# the channel has no tag config — never clobber it to untagged). Best-effort.
+discord_set_tags() {
+  local thread_id="$1" tags="$2"
+  [ -z "${DISCORD_GITHUB_BOT_TOKEN:-}" ] && return 0
+  [ -z "$thread_id" ] && return 0
+  { [ -z "$tags" ] || [ "$tags" = "[]" ]; } && return 0
+  curl -sS -o /dev/null --connect-timeout 10 --max-time 30 -X PATCH \
+    -H "Authorization: Bot ${DISCORD_GITHUB_BOT_TOKEN}" \
+    -H "Content-Type: application/json" \
+    -d "{\"applied_tags\": ${tags}}" \
+    "https://discord.com/api/v10/channels/${thread_id}" || true
+}