Close Phase 1 bead miroir-cdo - Core Routing complete

All DoD verified:
- Rendezvous assignment is deterministic (test_determinism)
- Adding 4th node moves ≤2×(1/4) shards (test_reshuffle_bound_on_add)
- 64 shards / 3 nodes / RF=1 → 18–26 shards per node (test_uniformity)
- Top-RF placement changes minimally (test_rf2_placement_stability)
- write_targets returns RG×RF nodes, one per group (test_write_targets_*)
- query_group distributes evenly (chi-square test)
- covering_set returns one node per shard (test_covering_set_*)
- merger passes all merge/facet/limit tests (39 tests)

105 tests pass for Phase 1 Core Routing functionality.

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.beads/traces/miroir-9dj.3/stderr.txt

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.beads/traces/miroir-uhj.10/stderr.txt

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+SessionEnd hook [/home/coding/.ccdash/hooks/session-end.sh] failed: /bin/sh: line 1: /home/coding/.ccdash/hooks/session-end.sh: cannot execute: required file not found
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