Fold in a changes file and update exceptions.txt.

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

changes/ticket32088

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+  o Major features (Proposal 310, performance + security):
+    - Implements Proposal 310 - Bandaid on guard selection.
+      Proposal 310 solves a load-balancing issue within Prop271 which strongly
+      impact experimental research with Shadow.
+      Security improvement: Proposal 310 prevents any newly Guard relay to
+      have a chance to get into the primary list of older Tor clients,
+      except if the N first sampled guards of these clients are unreachable.
+      Implements recommendation from 32088.
+      
+      Proposal 310 is linked to the CLAPS project researching optimal
+      client location-aware path selections. This project is a collaboration
+      between the UCLouvain Crypto Group, the U.S. Naval Research Laboratory and
+      Princeton University.