feat v1.16.0: new read-only houseplan-space-card (static single-space schematic, pointer-events:none, deep-link button) + #space=<id> deep-link in the full card. Shared space-geometry/space-render + module-level config-store cache. +6 unit tests, smoke_space_card & smoke_deeplink. Docs in same commit.

docs/TESTING.md

@@ -168,3 +168,14 @@ tap/hold/wizard/rules smokes). Bugs found during the run, fixed in the same rele
    conflict without resync — fixed in v1.13.2.
 Unchecked boxes above (real browsers/devices, multi-tab live sync, Companion apps)
 require hands on real hardware — they remain for the human pass.
+
+## houseplan-space-card (read-only embedded)
+- [ ] `type: custom:houseplan-space-card, space: <id>` renders the space identical to the full
+      card's plan (background + configured borders/names + icons), no header/controls [auto]
+- [ ] The schematic is fully non-interactive: click/hover anywhere does nothing — no more-info,
+      no tooltip, no drag (`.hp-static-stage` is pointer-events:none) [auto]
+- [ ] Footer button opens the full component already showing that space (deep-link `#space=<id>`) [auto]
+- [ ] Several cards with different `space` coexist on one board; one shared config WS request
+- [ ] Unknown `space` → tidy error card [auto]
+- [ ] `show_button: false` hides the footer
+- [ ] Full card honours `#space=<id>` on load and on hashchange; invalid id ignored [auto]