docs(web): reconcile program plan — Wave 4b merged, Batch 5 dispatched as stacked PRs #932–#936

[dotnetcadet]

Orchestrator reconciliation of docs/HTTP_WEB_PROGRAM_PLAN.md §5 (docs-only; no conflicts with the batch-5 stack, which never touches the plan file):

• Wave 4b (2026-07-20): all 8 stacked PRs merged (feat(web): pipeline exception boundary, status-code pages, 404 terminal via OnError hook [L03.01.01.19] #920–feat(web): HTTP/3 (QUIC) registration surface on the Web server builder [L03.01.01.01.06] #927), with the squash-merge adjacency lesson recorded for future stacks.
• Batch 5 (2026-07-20): dispatched as stacked PRs fix(http): end the h3 request stream at response completion [L01.01.11.44] #932→feat(web): source-generated typed-delegate endpoint binding [L03.01.02.03] #936 (merge bottom-up: [L01.01.11.44] Fix HTTP/3 server control-stream teardown: response round-trip fails with H3_CLOSED_CRITICAL_STREAM #928 → [L01.01.11.43] HTTP/1.1 request-target percent-decode parity with h2/h3 #895 → [L03.01.02.01.09] Rebase RouteHostConstraint host:port splitting onto the HttpHost component primitives #890 → [L03.01.02.03] Source-generated endpoint parameter binding and validation framework (AOT) #796), with the [L01.01.11.44] Fix HTTP/3 server control-stream teardown: response round-trip fails with H3_CLOSED_CRITICAL_STREAM #928 root-cause correction, the [L01.01.11.43] HTTP/1.1 request-target percent-decode parity with h2/h3 #895 HttpPath character-set owner decision, and the [L03.01.02.03] Source-generated endpoint parameter binding and validation framework (AOT) #796 middleware-first re-scope noted. Scope-creep filed: [L01.01.11.45] Reject malformed :path pseudo-headers gracefully on h2/h3 instead of throwing uncaught from the decode #937.
• With [L03.01.02.03] Source-generated endpoint parameter binding and validation framework (AOT) #796, §4 is drained except the two decision gates ([L03.01.01.11] Build Web.Rewrite: URL rewriting and redirect rules #782 request-mutation seam, [L01.01.11.35] Decide and implement WebSocket support (RFC 6455 framing over Upgrade and extended CONNECT) #765 WebSockets ADR) — the plan's retirement clause becomes actionable once they resolve.

Mergeable independently of the stack, in any order.

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