v0.3.0

Bundled cleanups: deprecates the legacy Log.__getitem__ lookup,
introduces a registry-driven dispatch for both modality bundles
(internal) and link devices, and removes two public constants whose
sentinel-int identity was never the right abstraction.

The breaking piece is the constant removal — small enough that the
maintainer confirmed no caller depends on the old names. The originally
0.3.0-targeted clean_emg_ekg_artifact port and the
_aggregate_bundles → pysampled.merge_along_signal_name migration
shift to a later release.

Removed (BREAKING)

• delsys.VO2_SENSOR_NUM and delsys.HR_SENSOR_NUM are no longer
  exported from the top-level package (or from delsys._constants).
  The sentinel values (900 / 901) survive as the integers stored
  in delsys.LINK_DEVICE_REGISTRY so existing pickles still resolve.

  Migration:

  Before (0.2.x)	After (0.3.0)
  s.number == delsys.VO2_SENSOR_NUM	s.is_link (any link device) or "VO2" in s.modalities
  delsys.HR_SENSOR_NUM	delsys.LINK_DEVICE_REGISTRY["HR Strap"][1]

Deprecated

• Log.__getitem__ — docstring-only deprecation (no runtime warning).
  Log.find(...) is the public-facing replacement; it takes named
  filters and always returns a list, instead of overloading five key
  types and collapsing single-match results. The legacy method is
  retained indefinitely for backward compatibility — there is no
  removal plan.

Added

• Sensor.is_link — boolean property identifying link devices (VO2
  Master / HR Strap, plus any future entry in
  LINK_DEVICE_REGISTRY). Use this in preference to comparing
  sensor.number against magic ints.
• LINK_DEVICE_REGISTRY (in delsys._constants, re-exported from the
  top-level package) — {sensor_name_substring: (modality, sensor_number)}
  driving link-device detection in _parse_sig_name_discover. Adding a
  new link device is now a registry edit + corresponding
  SUBCHANNEL_MAP / TARGET_SR / MODALITY_REGISTRY entries — no new
  branches in the parser.

Fixed

• EMG.get_features no longer trips pysampled's label/data validation.
  The previous implementation computed its time vector by feeding a
  lambda x, ax: x.squeeze() callable into apply_running_win, whose
  output collapsed the channel axis and ended up with n_signals != len(signal_names) * len(signal_coords). The time vector now comes
  directly from make_running_win.center_idx applied to the source
  signal's time grid, which sidesteps the round trip entirely.

Internal

• MODALITY_REGISTRY in delsys.sensor replaces the if/elif modality
  dispatch in Sensor.__init__. New modalities (e.g. the
  SmO2/Thb keys already in TARGET_SR) become a one-line
  registry edit. Behavior is unchanged for every modality the parser
  currently emits.
• _parse_sig_name_discover link-device branch now iterates
  LINK_DEVICE_REGISTRY instead of hard-coding "VO2 Master" /
  "HR Strap" substring checks.
• Log.export_to_csv switched from self[modality] to
  self.find(modality=modality, as_="modality") so the only remaining
  __getitem__ callers are external.