Clank 0.19.6

• Coalesce shared reactive dependency invalidation before effects run, eliminating duplicate executions and partially updated computed values from a single signal write.
• Dispose server-rendered component scopes after asynchronous output settles, releasing subscriptions and cleanup callbacks on success and failure.
• Revalidate unchanged static GET/HEAD responses with weak ETags and bodyless 304 responses, avoiding repeated file streams and asset transfers.
• Release unused HEAD response bodies and response readers after backpressured or early client disconnects, while preserving responses to rejected request bodies.
• Load managed-ingress custom domains in one query per routing snapshot and skip provider fleet reads on local-only installations, preserving immediate routing and fencing updates.
• Correct deployment-token setup guidance for workflows that prune inactive releases before publishing.

Validation: 710 tests and the complete package conformance, documentation, and security gates pass. Each fix was merged separately after the supported Node runtime and CodeQL checks passed. See PRs #177–#182 and the performance guide for regression evidence.