Add plugin builder for one-file client install

plugin/make-plugin.{sh,ps1} stamp a user's own Freshservice API key and the
shared server token into a template and emit a personalized freshservice.plugin
(direct HTTP MCP connection — no Node/mcp-remote/config editing on clients).
Built plugins embed credentials, so *.plugin is git-ignored; the committed
template holds only placeholders. Validated with 'claude plugin validate'.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugin/make-plugin.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# Build a personalized freshservice.plugin for Claude Desktop / Cowork.
+#
+# Each person runs this ONCE with their own Freshservice API key. The output
+# .plugin file contains your key — do not share it.
+#
+# Usage (interactive):
+#   ./make-plugin.sh
+# Or non-interactive:
+#   FS_KEY=... MCP_TOKEN=... ./make-plugin.sh
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TEMPLATE="$SCRIPT_DIR/template"
+
+SERVER_URL="${SERVER_URL:-http://192.168.101.12:3839/mcp}"
+FS_DOMAIN="${FS_DOMAIN:-pesco.freshservice.com}"
+
+if [ -z "${FS_KEY:-}" ]; then
+  printf "Your Freshservice API key (Freshservice → profile picture → Profile settings → API key): "
+  read -r FS_KEY
+fi
+if [ -z "${MCP_TOKEN:-}" ]; then
+  printf "Shared MCP server token (ask IT / Spencer): "
+  read -r MCP_TOKEN
+fi
+[ -n "$FS_KEY" ] || { echo "ERROR: API key is required." >&2; exit 1; }
+[ -n "$MCP_TOKEN" ] || { echo "ERROR: MCP token is required." >&2; exit 1; }
+
+BUILD="$(mktemp -d)"
+trap 'rm -rf "$BUILD"' EXIT
+cp -R "$TEMPLATE/." "$BUILD/"
+
+# Stamp placeholders using bash substitution (safe for special characters).
+for f in "$BUILD/.mcp.json"; do
+  content="$(cat "$f")"
+  content="${content//__SERVER_URL__/$SERVER_URL}"
+  content="${content//__FS_DOMAIN__/$FS_DOMAIN}"
+  content="${content//__FS_KEY__/$FS_KEY}"
+  content="${content//__MCP_TOKEN__/$MCP_TOKEN}"
+  printf '%s' "$content" > "$f"
+done
+
+# Sanity check: no placeholders left anywhere.
+if grep -rq "__[A-Z_]*__" "$BUILD"; then
+  echo "ERROR: unfilled placeholders remain; aborting." >&2
+  exit 1
+fi
+
+OUT="$SCRIPT_DIR/freshservice.plugin"
+rm -f "$OUT"
+(cd "$BUILD" && zip -r -q "$OUT" . -x "*.DS_Store")
+echo "Built: $OUT"
+echo "Install it in Claude Desktop (Cowork → Customize → add plugin), then start a new chat."
+echo "REMINDER: this file contains your personal API key — don't share it."