Adds two tests that fail on master:
1. TestResolveWithContext_Tier1_ConfidencePrefersMultiObserverEdge —
two 8a candidates from the same anchor's neighborhood. candX has
25 contributions from 1 observer (single-source, suspect); candY
has 30 contributions from 6 distinct observers (corroborated).
Resolver currently picks candX via tier-2 geo_proximity because
raw counts are within 3x of each other (1.2x). The test asserts
candY via neighbor_affinity — i.e. confidence weighting must
demote single-source edges enough that the corroborated edge
clears the affinityConfidenceRatio gate.
2. TestNeighborEdge_ObserverSetIsDistinct — repeated contributions
from the same observer must not inflate the Observers set; new
observers must increment it. Pins the source-diversity counter
behavior end-to-end via the public upsert path. Also asserts
Confidence() returns 1.0 saturated for >=3 observers and a value
in (0,1) for a single observer.
Confidence() ships as a 1.0-returning stub so the RED test fails
on an assertion (wrong candidate, wrong method) — not on a missing
method — keeping AGENTS.md "red commit must compile + fail on
assertion" discipline.
Refs #1229
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235b65b4e6