Semiotic v3.7.2

Added

• Stateless MCP HTTP mode for hosted connectors. semiotic-mcp --http now creates an
  ephemeral MCP server + Streamable HTTP transport per request, returns JSON responses instead of
  holding long-lived SSE streams open, and exposes /mcp, /healthz, and /health endpoints. This
  makes the read-only MCP tool surface suitable for autoscaling serverless hosts such as Cloud Run.
• Cloud Run deployment wrapper. deploy/cloud-run packages a minimal public MCP deployment that
  runs the published semiotic-mcp binary, documents unauthenticated read-only deployment, health
  endpoints, host allowlisting, and ChatGPT/Claude connector setup, and includes hosted-app privacy
  and terms pages for app review.

Changed

• MCP HTTP hardening. HTTP mode normalizes the Host header for optional
  MCP_ALLOWED_HOSTS DNS-rebinding protection, returns clean 404s for non-MCP paths including
  .well-known/* probes, makes request teardown idempotent, and closes each per-request transport
  promptly to avoid serverless keep-alive leaks.
• Docs dark-mode polish. The visible AccessibleNavTree selected row now resolves through
  --semiotic-surface, --semiotic-grid, and --semiotic-bg, with --semiotic-text applied to
  visible rows. The Accessibility / Structured Navigation bidirectional BarChart now mirrors the
  docs theme by switching between carbon and carbon-dark.
• Annotation blog demo reliability. The "Annotations That Get Contested, and Heard" chart now
  uses numeric XY coordinates with month tick formatting, so editorial-status callouts render on the
  visible line while the prose and navigation tree keep human-readable month labels.
• Cloud Run wrapper release line. The Cloud Run package now depends on semiotic@^3.7.2 so the
  hosted wrapper resolves the 3.7.2 MCP server after the npm package is published.

Fixed

• Fixed a light selected-row fallback in the accessible navigation tree when the docs site was in
  dark mode but no --semiotic-surface token was present.
• Fixed the bidirectional sync demo's BarChart rendering as a light Carbon island inside dark docs.
• Fixed missing visual annotations in the contested-annotations blog demo caused by string month
  values being used as XY coordinates.