cwc-makers: curl+tar fallback when git is missing

/maker-setup now falls back to GitHub's tarball endpoint when git isn't
on PATH, instead of detouring through a package-manager git install.
curl and tar ship with macOS, Linux, and Windows 10 1803+ out of the
box, so this is zero-install on every target platform — and a CwC
attendee just needs the files once to flash a device, not git history.

- maker-setup.md: git-clone fast path, curl|tar (Unix) / curl+tar+
  Rename-Item (PowerShell) fallback, normalizes the -main suffix
- m5-onboard/SKILL.md: drop git from required deps + per-OS git
  bootstrap block; keep Python bootstrap
- README: git now listed as optional

Linear: CC-1975

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

🏠 Remote-Dev: homespace

.claude-plugin/marketplace.json

@@ -2014,69 +2014,6 @@
       "source": "./external_plugins/terraform",
       "homepage": "https://github.com/anthropics/claude-plugins-public/tree/main/external_plugins/terraform"
     },
-    {
-      "name": "twilio-developer-kit",
-      "description": "Twilio Skills provide procedural knowledge for AI coding agents — which APIs to use, in what order, and what to avoid. Covers SMS, Voice, WhatsApp, Verify, SendGrid, Compliance, and 30+ products.",
-      "author": {
-        "name": "Twilio"
-      },
-      "category": "development",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/twilio/ai.git",
-        "sha": "137c4679855d31115a8509b93a3887b8bb317da9"
-      },
-      "strict": false,
-      "skills": [
-        "./skills/sendgrid/twilio-sendgrid-account-setup",
-        "./skills/sendgrid/twilio-sendgrid-deliverability-advisor",
-        "./skills/sendgrid/twilio-sendgrid-email-send",
-        "./skills/sendgrid/twilio-sendgrid-email-settings",
-        "./skills/sendgrid/twilio-sendgrid-engagement-quality",
-        "./skills/sendgrid/twilio-sendgrid-inbound-parse",
-        "./skills/sendgrid/twilio-sendgrid-suppressions",
-        "./skills/sendgrid/twilio-sendgrid-webhooks",
-        "./skills/twilio/twilio-account-setup",
-        "./skills/twilio/twilio-call-recordings",
-        "./skills/twilio/twilio-cli-reference",
-        "./skills/twilio/twilio-compliance-onboarding",
-        "./skills/twilio/twilio-compliance-traffic",
-        "./skills/twilio/twilio-conference-calls",
-        "./skills/twilio/twilio-content-template-builder",
-        "./skills/twilio/twilio-conversations-classic-api",
-        "./skills/twilio/twilio-debugging-observability",
-        "./skills/twilio/twilio-email-deliverability-advisor",
-        "./skills/twilio/twilio-iam-auth-setup",
-        "./skills/twilio/twilio-identity-verification-advisor",
-        "./skills/twilio/twilio-lookup-phone-intelligence",
-        "./skills/twilio/twilio-marketing-promotions-advisor",
-        "./skills/twilio/twilio-messaging-channel-advisor",
-        "./skills/twilio/twilio-messaging-overview",
-        "./skills/twilio/twilio-messaging-services",
-        "./skills/twilio/twilio-messaging-webhooks",
-        "./skills/twilio/twilio-notifications-alerts-advisor",
-        "./skills/twilio/twilio-numbers-senders",
-        "./skills/twilio/twilio-organizations-setup",
-        "./skills/twilio/twilio-rcs-messaging",
-        "./skills/twilio/twilio-regulatory-compliance-bundles",
-        "./skills/twilio/twilio-reliability-patterns",
-        "./skills/twilio/twilio-security-api-auth",
-        "./skills/twilio/twilio-security-compliance-hipaa",
-        "./skills/twilio/twilio-security-hardening",
-        "./skills/twilio/twilio-send-message",
-        "./skills/twilio/twilio-sms-isv-setup",
-        "./skills/twilio/twilio-sms-send-message",
-        "./skills/twilio/twilio-taskrouter-routing",
-        "./skills/twilio/twilio-verify-send-otp",
-        "./skills/twilio/twilio-voice-conversation-relay",
-        "./skills/twilio/twilio-voice-outbound-calls",
-        "./skills/twilio/twilio-voice-twiml",
-        "./skills/twilio/twilio-webhook-architecture",
-        "./skills/twilio/twilio-whatsapp-manage-senders",
-        "./skills/twilio/twilio-whatsapp-send-message"
-      ],
-      "homepage": "https://www.twilio.com"
-    },
     {
       "name": "typescript-lsp",
       "description": "TypeScript/JavaScript language server for enhanced code intelligence",
@@ -2238,7 +2175,7 @@
         "url": "https://github.com/zapier/zapier-mcp.git",
         "path": "plugins/zapier",
         "ref": "main",
-        "sha": "f34a7854febed415c9ef766eec1c66529ef0668e"
+        "sha": "76c4669321847c8f72a6e0462c17f29fd437519a"
       },
       "homepage": "https://github.com/zapier/zapier-mcp/tree/main/plugins/zapier"
     },