[codex] Unify CII risk weight source of truth (#3926)

* fix(cii): unify risk weight source of truth

* fix(cii): keep methodology version stable

* test(cii): close drift-guard gaps surfaced by greptile

- Add SERVER_TIER1_COUNTRIES import from
  server/worldmonitor/intelligence/v1/_shared.ts and assert its keys
  equal shared CII_COUNTRY_WEIGHTS keys. computeCIIScores iterates the
  server's TIER1_COUNTRIES (not the frontend copy), and that map was
  previously not covered by any drift guard — adding a country to the
  shared table without updating server _shared.ts would have silently
  skipped scoring for the new country (greptile P2).

- Remove the two tautological deepEqual checks on BASELINE_RISK and
  EVENT_MULTIPLIER key sets. Both maps are { ...CII_BASELINE_RISK } /
  { ...CII_EVENT_MULTIPLIER } spreads of the shared module derived
  from CII_COUNTRY_WEIGHTS via Object.fromEntries — the assertions
  compared a set to itself and could never fail. The per-country
  assert.equal loop below already enforces the real invariant
  (greptile P2).