docs: fix and annotate research links after link check

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/research/notes/activepieces.md

@@ -160,7 +160,7 @@ The main criticisms: the enterprise features most teams need (SSO from $200/mo,
 - Reviews disagree on what is paywalled (SSO/SAML, audit logs, branding, RBAC, white-label). One notes that having the source does not grant rights to the commercial modules. — [ohaiknow](https://ohaiknow.com/reviews/activepieces/), [opsily (managed-n8n vendor, biased)](https://opsily.com/hosting/n8n/activepieces-self-hosted-limitations), [baeseokjae](https://baeseokjae.github.io/posts/activepieces-review-2026/)
 - Single-source claims: no sub-flow architecture, more manual error handling, a loop step failing silently on empty arrays, no native flow version control. — [syncgtm](https://syncgtm.com/blog/activepieces-review). The sub-flow claim conflicts with the product's documented Subflows piece; the versioning claim is unverified.
 - Smaller catalog (300+ vs Zapier's 7,000+), and some pieces have few triggers/actions. — [syncgtm](https://syncgtm.com/blog/activepieces-review), [workflowautomation.net](https://workflowautomation.net/reviews/activepieces)
-- Sparse or outdated docs for Kubernetes, multi-tenant, and enterprise SSO. Community-only support (Discord/GitHub) on free. No SOC 2 / HIPAA BAA for self-hosted. — [review roundup via search: noviqip](https://noviqip.com/blogs/guides/activepieces-review-2026), [digioffly](https://digioffly.com/activepieces-review/)
+- Sparse or outdated docs for Kubernetes, multi-tenant, and enterprise SSO. Community-only support (Discord/GitHub) on free. No SOC 2 / HIPAA BAA for self-hosted. — [review roundup via search: noviqip](https://noviqip.com/blogs/guides/activepieces-review-2026), [digioffly](https://digioffly.com/activepieces-review/) (unreachable as of 2026-10-30)
 - n8n is seen as more flexible and powerful for code-heavy users, while G2 reviewers praise Activepieces' easy setup. — [G2 compare](https://www.g2.com/compare/activepieces-vs-n8n), [agntable](https://www.agntable.com/blog/activepieces-vs-n8n)
 - Default `AP_EXECUTION_MODE=UNSANDBOXED` in CE. The docs call sandboxing "the most important security decision for multi-tenant deployments". — [docs: workers](https://www.activepieces.com/docs/install/architecture/workers), [docs: environment variables](https://www.activepieces.com/docs/install/reference/environment-variables)
 - The docs themselves warn that the default `AP_WORKER_CONCURRENCY=5` "widens the OOM blast radius", and that `AP_PREWARM_CACHE_ON_STARTUP` can OOM small workers. — [docs: workers](https://www.activepieces.com/docs/install/architecture/workers), [docs: environment variables](https://www.activepieces.com/docs/install/reference/environment-variables)