openup: EA model built + enriched - baseline, associations, joint design package

Windows/EA session per BUILD-CHECKLIST 0-6 (the planned human-gate path,
executed on the EA machine). Baseline built from EABase.eapx via
build-model.ps1 and verified per checklist 4: 3 actors, 12 UCs with
scenarios, 13 associations, 0 include connectors, 7 SS requirements,
12 realization packages / 36 elements; UC-08 MSS (9 steps) and UC-11
learn spell level (3 steps) match use-case-model.md verbatim.

Script fixes (defects 1-3 of the session log): PS 5.1 hashtable parse
error; realization UC lookup now accepts short and full use-case names.

Enrichment after a manual layout pass - model changes are surgical from
now on, re-running build-model.ps1 is forbidden (checklist 6):
- add-analysis-associations.ps1: 24 analysis associations per mapping
  2a (boundary-controller-entity; UC-04 boundary-entity) rendered via
  DiagramLinks without touching manual layout; 4 uses-dependencies to
  DomainError (UC-05/06/08/12 error paths, model-level)
- add-design-package.ps1: Analysis-Design/Design - joint component
  model (skara-brae-client, sb-api, sb-auth, sb-db, sb-core, sb-shared,
  sb-common; 10 dependencies, rule inward). Joint-model decision
  recorded in mapping 1: one model for server+client+common; client-
  side UC realizations are a future work item.

Markdown sources updated first (drift rule): mapping 1 tree + 2a
interactions + 3 design component model; checklist 6. Exports
regenerated from the model: use-case-model.json new,
uc-realizations.json re-exported (useCase full names, notes merged,
crossCutting added; element content verified equal to the
markdown-to-json generator output).

Open: XMI backup - ExportPackageXMI fails via COM (DISP_E_TYPEMISMATCH,
PS 5.1 + cscript); manual EA UI export per model/README.md option 2.

scripts/openup/build-model.ps1

@@ -305,7 +305,7 @@ try {
             @{ Name = 'Alternate flows'; Type = 'Alternate';
                Notes = 'already at max level; not enough XP; not enough gold -> all 422. Foreign character -> 403; not found -> 404.'; Steps = @() }
         )
-    )
+    }
     foreach ($useCase in $useCases) {
         $ucElement = $elements[$useCase.Name]
         foreach ($scenarioData in $scenariosByUc[$useCase.Name]) {
@@ -375,7 +375,12 @@ try {
     $architecture.Elements.Refresh()
 
     $step = 'UC realization packages (from exports/uc-realizations.json)'
+    $elementsByShortName = @{}
+    foreach ($useCase in $useCases) { $elementsByShortName[$useCase.Name.Substring(6)] = $elements[$useCase.Name] }
     foreach ($realization in $realizations.realizations) {
+        $supplierElement = $elements[$realization.useCase]
+        if (-not $supplierElement) { $supplierElement = $elementsByShortName[$realization.useCase] }
+        if (-not $supplierElement) { throw "use case not found for $($realization.id): $($realization.useCase)" }
         $realizationPackage = $analysisDesign.Packages.AddNew($realization.id, 'Package')
         $null = $realizationPackage.Update()
         $analysisDesign.Packages.Refresh()
@@ -385,7 +390,7 @@ try {
         $realizationPackage.Elements.Refresh()
         $connector = $collaboration.Connectors.AddNew('', 'Realization')
         $connector.ClientID = $collaboration.ElementID
-        $connector.SupplierID = ($elements[$realization.useCase]).ElementID
+        $connector.SupplierID = $supplierElement.ElementID
         $null = $connector.Update()
         $collaboration.Connectors.Refresh()