stop auto-computing area

[TeunHuijben]

The problem: The original code auto-computed area from scratch on Tracks initialization (if it wasn't already on the graph nodes). Commenting out the core_computed_features.append("area") line entirely broke the case where area was already on the graph — it would no longer be registered in tracks.features or activated in the annotator.

The fix: Replace the single list with a list of (key, compute_if_missing) tuples. area gets compute_if_missing=False, meaning:

• If area is already on the graph → activated and added to tracks.features (backward compat for files that have area)
• If area is not on the graph → skipped; caller must use enable_features(["area"]) explicitly

# (key, compute_if_missing) pairs
core_features: list[tuple[str, bool]] = []
...
core_features.append((pos_key, True))
core_features.append(("area", False))   # activate if present, never compute from scratch
...
for key, compute_if_missing in core_features:
    if self._check_existing_feature(key):
        ...
        self.annotators.activate_features([key])
    elif compute_if_missing:
        self.enable_features([key])

Closes #193

[TeunHuijben]

@cmalinmayor, does this answer your original comment:

This is our opportunity to stop auto-computing area as a special backward compatible feature - just worth considering before we release, not necessary to merge this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.35%. Comparing base (6d9c5a8) to head (4747b9f).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #208   +/-   ##
=======================================
  Coverage   93.35%   93.35%           
=======================================
  Files          59       59           
  Lines        3249     3250    +1     
=======================================
+ Hits         3033     3034    +1     
  Misses        216      216           

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