* refactor(intelligence): preserve digest threat fields through normalization (#2050)
* fix(intelligence): shallow-copy cluster threat, add medium to GlobeMap color map and VALID_THREAT_LEVELS
- _clustering.mjs: spread-copy threat object instead of passing reference to prevent downstream mutation from corrupting cluster data
- GlobeMap.ts: add 'medium' to threatLevel color guards (marker render + tooltip) so new digest taxonomy shows yellow/orange instead of falling through to the info-blue default
- InsightsPanel.ts: extend VALID_THREAT_LEVELS to include new taxonomy values (medium/low/info) so the safeThreat guard stays in sync
* fix(intelligence): normalize proto threat levels and use tier-sorted cluster threat
P1: digest items store THREAT_LEVEL_HIGH/MEDIUM/etc (proto enum strings from
toProtoItem). Copying item.threat verbatim caused threatLevel: 'THREAT_LEVEL_HIGH'
to land in output, missing every downstream check (THREAT_RGB, badge render,
GlobeMap color switch). Add normalizeThreat() with PROTO_TO_LEVEL map at read
time so values arrive as 'high'/'medium'/etc.
P2: cluster threatItem was found via group.find() on the unsorted insertion-order
array. A low-tier item first in the array would win over a Reuters item. Switch
to sorted.find() (already tier/date sorted for primary selection) to prefer the
highest-quality source's threat classification.
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