Two unrelated metadata fixes, one per folder group. The `h5_diff` report for each is at the bottom.
### 1. `metadata/annotations/anatomy` is missing (164 files)
Adds `anatomy = "heart"` to the in-vivo echocardiography files in `data/Fundamental/` and `data/Harmonic/`.
Source: the README describes transthoracic echocardiography acquired to visualise the left atrial appendage, with standard cardiac views (apical two/four chamber, parasternal short/long axis, subxiphoid). The label names the organ imaged; the appendage was the clinical target. This matches how the rest of the corpus labels cardiac scans.
### 2. `data/CIRS_validation/CIRS_fundamental.hdf5` says `subject/type = in_vivo` (1 file)
Changes it to `phantom`. The folder and file name indicate a CIRS phantom scan used for validation, but the file carries the same `subject/type` as the 164 patient files, so any analysis that groups by subject type counts it as a patient acquisition. The README does not mention this file.
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