## Why

The Stern School published an updated J27 Specializations one-pager (dated 5/6/2026) that introduces a new Healthcare specialization, cancels the Customer Insights elective, lists Managing Growing Companies as a cancelled placeholder in Summer Set 2, renames Social Media and Mobile Technology to Digital Marketing Strategy in Practice (with a substantively different course description and focus), and cross-lists four existing courses to the new Healthcare specialization. The solver's data files must match the official sheet so students rely on accurate availability information.

## What Changes

- Add **Healthcare (HCR)** specialization (10 credits, no required course)
- Add HCR qualification to four existing courses:
  - `spr2-health-medical` (Business of Health & Medical Care)
  - `spr3-analytics-ml` (Analytics & Machine Learning for Managers)
  - `sum2-social-media` (formerly Social Media and Mobile Technology)
  - `fall1-managing-change` (Managing Change)
- Rename `sum2-social-media` to **Digital Marketing Strategy in Practice** and replace its course description with the new MSKCC-anchored content (provided in `digital-marketing.txt`); clear instructor field pending confirmation of new lead instructor
- Mark **`spr5-customer-insights`** as `cancelled: true` (retain entry; do not delete) — switching from prior delete-and-replace pattern to the existing-but-unused `cancelled` flag pattern (Approach B)
- Add a new cancelled-only entry **`sum2-managing-growing-companies`** ("Managing Growing Companies") to Summer Set 2 with `cancelled: true` and no qualifications, restoring the printed sheet's 5-slot listing
- Update test assertions in `app/src/data/__tests__/data.test.ts` to reflect the 15th specialization, the 5-entry sum2 set, and revised per-spec set counts (BRM, MKT lose `spr5-customer-insights`)

## Capabilities

### New Capabilities

_None — this is a data refresh that uses existing capabilities (`course-data`, `specialization-ranking`)._

### Modified Capabilities

- `course-data`: Add Healthcare specialization, four HCR cross-listings, the renamed Digital Marketing course, and two cancelled-flag entries. Adopt `cancelled: true` (Approach B) as the standing pattern for cancelled courses, superseding the prior delete-and-replace approach.

## Impact

- `app/src/data/specializations.ts` — add HCR entry
- `app/src/data/courses.ts` — five qualification/name edits, one new cancelled entry, one cancelled-flag edit
- `app/src/data/electiveSets.ts` — append `sum2-managing-growing-companies` to `sum2.courseIds`
- `app/src/data/courseDescriptions.ts` — replace `sum2-social-media` description; clear instructors
- `app/src/data/__tests__/data.test.ts` — update specialization count (14→15), course count (46→47), and per-spec/STR-marker assertions
- `app/vite.config.ts` — bump `__APP_VERSION__` and `__APP_VERSION_DATE__`
- `CHANGELOG.md` — add release entry
- No code changes to solver, lookups, or UI: existing `cancelled` plumbing in `lookups.ts:43-50`, `appState.ts:94-95`, and `CourseSelection.tsx:279` already handles greying-out and solver exclusion