docs(ssr-data-plugin): close audit-2026-05-16 — wiki sync
Companion to the main-repo audit closure (test(ssr-data-plugin): close
audit-2026-05-16). Wiki side:
- New SSR-Cancellation.md: replaces a broken link from
packages/ssr-data-plugin/README.md and CLAUDE.md. Covers three signal
sources (request-scoped via cloneRouter, per-navigation, per-loader
withTimeout deadline), manual wiring vs createRequestScope helper,
withTimeout's composed AbortSignal semantics (pre-aborted upstream
short-circuit, cooperative cancellation, late-rejection absorption),
the robust upfront signal.aborted check pattern, and HTTP 504 mapping
via the structural .code discriminator.
- ssr-data-plugin.md updates:
- §5 Interception Mechanism: subscribeLeave revalidation listener row
added (was missing — CSR revalidation channel #605 was hidden).
- §5 Data Flow: rewritten to show all 4 namespaces (data /
ssrDataMode / ssrDataDeferred / ssrDataDeferredKeys), client-only
skip branch, hydration-scratchpad reuse path, and isDeferred()
split. Previous diagram only showed `data`, predating #610.
- §14 wire format: serialize/serializeError/bootstrap option semantics
expanded with defaults + panic-fallback chain for serializeError.
- §15 NEW — Composition with @real-router/rsc-server-plugin: side-by-
side usage on the same router, namespace separation table, claim
independence (invalidate("data") leaves rsc cached and vice versa).
_Sidebar.md is intentionally NOT in this commit — it has pre-existing
unrelated unstaged changes that should be sorted separately. Add a
[SSR Cancellation](./SSR-Cancellation) link under Concepts and SSR/SSG
when convenient.