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ProcessingPrediction split (#272) (#277)

Phase A of the architectural cleanup. Pepsickle results now have
their own record type, parallel to EpitopePrediction.

The two prediction kinds live on different axes:

- ``EpitopePrediction`` is a **(peptide, allele) MHC-binding** score
  (``mhctools.BindingPredictor`` output — pMHC affinity / presentation /
  stability).
- ``ProcessingPrediction`` is a **(peptide, source_sequence)
  proteasomal-cleavage** score (``mhctools.ProcessingPredictor``
  output — no allele axis).

Pre-2.22 vaxrank annotated EpitopePrediction objects in place with
``pepsickle_*`` fields. That conflated the two and made it awkward
to add a second per-position cleavage predictor (NetChop, PAProC,
…) without colliding.

This commit:

- Adds ``vaxrank/processing_prediction.py`` with
  ``ProcessingPrediction`` (frozen dataclass): peptide_sequence,
  source_sequence, predictor_name, predictor_version,
  c_term_cleavage_prob, max_internal_cut_prob, processing_score.
  ``key()`` returns the join key ``(peptide, source, predictor_name)``
  used by report writers at render time.
- Modifies ``annotate_processing`` to also build a
  ``{key: ProcessingPrediction}`` map alongside the existing
  in-place mutation, and return ``(n_annotated, map)`` (was just
  ``int``). The map is the post-2.22 canonical record.
- Keeps the legacy in-place mutation for one deprecation cycle so
  existing report writers continue to render. New downstream code
  consumes the map.

Tests:

- New ``test_annotate_processing_returns_processing_prediction_map``
  pins the map shape + content + cross-check against the in-place
  mutation.
- Existing tests updated to unpack the new ``(n, map)`` tuple.

Phase B (future PR): drop the in-place mutation entirely; update
report writers to look up ProcessingPrediction by key at render
time. Until then, ``EpitopePrediction.pepsickle_*`` fields are
deprecated and read-only mirrors of the canonical record.

Bump to 2.22.0.
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