docs(11): create phase plan

.planning/phases/11-jobs-realtime-and-search-infrastructure/COVERAGE.md

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+# API Coverage — Phase 11 (Centrifugo, Typesense, Web Push services)
+
+> Full coverage by default. Opt-outs are explicit, reasoned decisions. The PHP clients being ported (websockets `CentrifugoClient`, Scout `TypesenseEngine`, the websockets push block) define the baseline; D-12 and D-19 make both clients hand-rolled on net/http.
+
+## Centrifugo server HTTP API (outbound, plan 11-03 and 11-04)
+
+| capability | decision | reason |
+|---|---|---|
+| publish | INTEGRATE | |
+| broadcast | INTEGRATE | |
+| presence | INTEGRATE | |
+| unsubscribe | INTEGRATE | |
+| info | INTEGRATE | |
+| presence_stats | OPT-OUT | not in the PHP CentrifugoClient contract and no Phase 11-15 consumer |
+| history | OPT-OUT | not in the PHP CentrifugoClient contract; the Nuxt client does not use history recovery |
+| history_remove | OPT-OUT | not in the PHP CentrifugoClient contract and no consumer |
+| channels | OPT-OUT | not in the PHP CentrifugoClient contract and no consumer |
+| disconnect | OPT-OUT | not in the PHP CentrifugoClient contract; token revocation is not part of the port |
+| refresh | OPT-OUT | not in the PHP CentrifugoClient contract; connection tokens expire by exp as in PHP |
+| subscribe (server-side) | OPT-OUT | not in the PHP CentrifugoClient contract; clients subscribe through the subscribe proxy |
+| batch | OPT-OUT | not needed; PHP sends one request per publish or broadcast |
+
+## Centrifugo proxy and token contract (inbound and signed, plan 11-03)
+
+| capability | decision | reason |
+|---|---|---|
+| subscribe proxy | INTEGRATE | |
+| connection token (HS256) | INTEGRATE | |
+| subscription token (HS256) | INTEGRATE | |
+| anonymous and identifier tokens | INTEGRATE | |
+| connect proxy | OPT-OUT | explicitly out of scope — PHP authenticates connections with JWTs, not a connect proxy |
+| refresh proxy | OPT-OUT | explicitly out of scope — not configured on the existing Centrifugo server |
+| publish proxy | OPT-OUT | explicitly out of scope — clients never publish; the server publishes through the HTTP API |
+| sub_refresh proxy | OPT-OUT | explicitly out of scope — not configured on the existing Centrifugo server |
+| rpc proxy | OPT-OUT | explicitly out of scope — the Nuxt client makes no Centrifugo RPC calls |
+
+## Typesense API (outbound, plan 11-05)
+
+| capability | decision | reason |
+|---|---|---|
+| collection retrieve | INTEGRATE | |
+| collection create | INTEGRATE | |
+| collection delete (flush) | INTEGRATE | |
+| documents import upsert | INTEGRATE | |
+| document delete | INTEGRATE | |
+| documents search | INTEGRATE | |
+| multi_search | OPT-OUT | not needed — Scout issues single-collection searches |
+| delete documents by filter | OPT-OUT | not needed yet — Phase 14 reindex (SRCH-02) decides its own flush strategy |
+| collection update (schema alter) | OPT-OUT | not needed — schema changes go through reindex, as in PHP |
+| aliases | OPT-OUT | not needed yet — the legacy-index drop belongs to Phase 14 SRCH-02 |
+| synonyms and curation overrides | OPT-OUT | not used by the PHP app |
+| API keys management | OPT-OUT | explicitly out of scope — keys are operator-provisioned |
+| health and metrics | OPT-OUT | not needed — sync failures are logged per request and never block writes |
+
+## Web Push service protocol (outbound, plan 11-04)
+
+| capability | decision | reason |
+|---|---|---|
+| send notification (RFC 8030 push with RFC 8291 payload and RFC 8292 VAPID) | INTEGRATE | |
+| message urgency and topic headers | INTEGRATE | |
+| receipts (push message receipts) | OPT-OUT | not needed — PHP never requested receipts and push services rarely support them |
+| subscription management (store and prune) | OPT-OUT | explicitly out of scope — subscriptions come from an app-provided SubscriptionSource (user decision 3); Płytarium has no store |