chore(discord): suppress link embeds and handle truncated URLs (#1126)

* chore(discord): suppress link embeds and handle truncated URLs

- Add wrap_urls() to wrap URLs in <> to suppress Discord embeds
- Add strip_trailing_url() to remove partial URLs from truncated text
- Update all 6 workflow jobs with body text to use the new helpers
- Partial URLs (from truncation) are removed since they are unusable
- Complete URLs are wrapped to prevent large embed previews

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(discord): preserve URLs when escaping markdown

- Replace sed-based esc() with awk version that skips content inside
  <URL> wrappers, preventing URL corruption from backslash escaping
- Reorder pipeline: wrap_urls | esc (wrap first, then escape)
- Update comment: "partial" → "incomplete" for clarity

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Brian <bmadcode@gmail.com>

.github/scripts/discord-helpers.sh

@@ -2,8 +2,21 @@
 # Discord notification helper functions
 
 # Escape markdown special chars and @mentions for safe Discord display
-# Bracket expression: ] must be first, then other chars. In POSIX bracket expr, \ is literal.
-esc() { sed -e 's/[][\*_()~`>]/\\&/g' -e 's/@/@ /g'; }
+# Skips content inside <URL> wrappers to preserve URLs intact
+esc() {
+  awk '{
+    result = ""; in_url = 0; n = length($0)
+    for (i = 1; i <= n; i++) {
+      c = substr($0, i, 1)
+      if (c == "<" && substr($0, i, 8) ~ /^<https?:/) in_url = 1
+      if (in_url) { result = result c; if (c == ">") in_url = 0 }
+      else if (c == "@") result = result "@ "
+      else if (index("[]\\*_()~`", c) > 0) result = result "\\" c
+      else result = result c
+    }
+    print result
+  }'
+}
 
 # Truncate to $1 chars (or 80 if wall-of-text with <3 spaces)
 trunc() {
@@ -13,3 +26,9 @@ trunc() {
   [ "$spaces" -lt 3 ] && [ ${#txt} -gt 80 ] && txt=$(printf '%s' "$txt" | cut -c1-80)
   printf '%s' "$txt"
 }
+
+# Remove incomplete URL at end of truncated text (incomplete URLs are useless)
+strip_trailing_url() { sed -E 's~<?https?://[^[:space:]]*$~~'; }
+
+# Wrap URLs in <> to suppress Discord embeds (keeps links clickable)
+wrap_urls() { sed -E 's~https?://[^[:space:]<>]+~<&>~g'; }