## Validator Changes
* Validate that ConceptMap references to ValueSets are actual value sets
* Check if abstract classes have concrete subtypes in scope
* Handle tx ecosystem failure properly
* fix for CLI Should Fail with Non-Zero Exit Code on TX Test Errors
## Other code changes
* Add support for multiple lines in the first cell in heirarchical tables
* Also add support for suppressing lines and inner borders
* Add support for table.rows in TestDataFactory
* Add Element View for non-technical readers of profiles
* Improved Rendering for Timing Datatype
* Fix for handling SD extensions when generating snapshots
* Don't remove bindings from types with characteristics = can-bind (Extensions in R5)
* Various minor Fixes for generating snapshots for archetypes (checking type parameters)
* Fix logback configs + update logback (#1868)
* .qos.logback-logback-core-1.5.13: Fix inclusion of logback-test in jar and fix classpath log configs
* Fix LoggingPolicy enum (use SLF4J)
***NO_CI***
## Validator Changes
* Christmas 2025 Add new command option to validator: [test instance factory](https://confluence.hl7.org/display/FHIR/Using+the+FHIR+Validator#UsingtheFHIRValidator-GeneratingTestInstancesusingFactories)
* Fix validation of invariants in profiles - check for more conflicts, and don't call conflict if the expression is the same
* Fix issues with tracking supplement usage and getting supplement version matching correct
* Fix npe loading old simplifier package
## Other code changes
* Fix handling of ValueSetVersion parameter in txTests
* Test Instance Generation, and many fixes to PE model
* Fix logical model rendering to use type characteristics for can-be-target
* Only use profiled datatype information for generating snapshots for Resource and Extension
* Fix comparison template loading issue
***NO_CI***
## Validator Changes
* Start removing R2 support- add note that it's not officially supported anymore
* Add support for finding the existence of implicit value sets
* move tx tests to tx-ecosystem IG and change -txTests parameters
* Switch priority order of package servers (packages2.fhir.org is not rate limited)
* Fix issue with value set version conversion on contains.property (Check for both "value" and "value[x]")
* Fix error message validating ConceptMap when size too large
## Other code changes
* Security fix: Bump ucum to 1.0.9
* Add XhtmlToMarkdown library
* Add support for THO rendering of NamingSystem information
* Add profile-based sample instance generation (WIP)
* fixes for snapshot generation test debugging
* Add support for languages to npm package and package list
* fix rendering issues - resources with no id, and urn: references shouldn't be links
* fix regex escapes in R5 Constants regex for RESTful references
* Improvements to translation file generation (better path, eliminate duplicates)
***NO_CI***
