Add sales division to installers, linter, and README

- Add sales/ to claude-code and copilot installer dir lists
- Add sales/ to lint-agents workflow trigger and changed-files filter
- Add LinkedIn Content Creator to marketing table in README
- Update agent count to 120

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/install.sh

@@ -267,7 +267,7 @@ install_claude_code() {
   local count=0
   mkdir -p "$dest"
   local dir f first_line
-  for dir in design engineering game-development marketing paid-media product project-management \
+  for dir in design engineering game-development marketing paid-media sales product project-management \
               testing support spatial-computing specialized; do
     [[ -d "$REPO_ROOT/$dir" ]] || continue
     while IFS= read -r -d '' f; do
@@ -285,7 +285,7 @@ install_copilot() {
   local count=0
   mkdir -p "$dest"
   local dir f first_line
-  for dir in design engineering game-development marketing paid-media product project-management \
+  for dir in design engineering game-development marketing paid-media sales product project-management \
               testing support spatial-computing specialized; do
     [[ -d "$REPO_ROOT/$dir" ]] || continue
     while IFS= read -r -d '' f; do