Complete Jasmine to Mocha test migration

AGENTS.md

@@ -54,12 +54,16 @@ Make targets (they include `tools/build.mk`).
 ## Testing
 
 - **Runner**: Karma
-- **Frameworks**: Mocha + Chai + Sinon (preferred for new tests), Jasmine 1.3 (legacy)
+- **Frameworks**: Mocha + Chai + Sinon
 - **Browsers**: Electron (default), Chrome Headless, Firefox Headless
 - **Coverage**: nyc/Istanbul (~89% statements, ~83% branches)
 - **Test files**: `packages/*/spec/` directories
 
-When writing new tests, use Mocha/Chai/Sinon (not Jasmine).
+Use Mocha/Chai/Sinon for repository tests.
+
+Do not:
+- split shared specs into runner-specific versions while they still need to run
+  in the browser harness
 
 ## Code Style
 

COVERAGE.md

@@ -173,5 +173,4 @@ All files                             |   89.73 |    83.31 |   86.25 |   89.77 |
   selectExtensions.js                 |   97.82 |    96.96 |     100 |   97.61 | 30                 
   virtualElements.js                  |   93.98 |    91.78 |   94.73 |   94.06 | 143-149,178-179    
  packages/utils/helpers               |      90 |    69.44 |   94.28 |   89.43 |                    
-  jasmine-13-helper.ts                |      90 |    69.44 |   94.28 |   89.43 | ...165,177,231,256 
-
+  mocha-test-helpers.ts              |      90 |    69.44 |   94.28 |   89.43 | ...165,177,231,256

README.md

@@ -72,7 +72,7 @@ Start tests with electron: `make test`
 
 Start tests with headless-chrome: `make test-headless`
 
-The test setup has naturally grown and been ported from knockout.js. Some tests use Jasmine 1.3, newer ones use Mocha, Chai and Sinon. Karma is used as test runner rather as test pipeline
+The test setup has been ported from knockout.js and standardized on Mocha, Chai and Sinon. Karma is used as the test runner.
 
 Other options:
 
@@ -128,10 +128,7 @@ Additionally, implement a well-configured [Content Security Policy (CSP)](https:
 - Test-Environment -> electron and headless-chrome
 - Linting -> Eslint
 - Formatting -> Prettier (configured like StandardJS)
-- TDD/BDD-Frameworks -> 
-    - Jasmine 1.3
-    - Mocha + Chai
-    - sinon (Mocks)
+- TDD/BDD-Frameworks -> Mocha + Chai + Sinon
 - Testing-Cloud-Service -> sauce
 - standard -> Code-Style (outdated for typescript)