refactor: remove legacy social agent systems

[christopherjnelson]

PR 2 of the zero-swarm migration. Follows #65 (refactor: make zero swarm the sole cognition architecture).

Removes the social/cognition machinery that existed for the retired independent multi-agent architecture. Agent Zero plus Jev reflex workers over the deterministic H3 engine is the only architecture now, so the concepts these systems modelled no longer exist in the game.

32 files changed, +943 / −13,185.

Removed

• personalities, behavior/strategy profiles, behavior assignment (packages/shared/src/behavior.ts)
• agent-to-agent communication: public, direct, alliance and zero channels, ranges, delivery, observations, metrics, UI
• diplomacy, alliances, alliance proposals, and their events/validation/UI
• model-authored worker goals and prose worker memories
• the legacy per-agent generative decision contract: agentDecisionSchema, providerDecisionEnvelopeSchema, AgentTurnRecord, export turn records
• ObservationHistory and the Behavior Trace panel
• the legacy experiment import surface (/api/simulation/experiment/import, importModelConfiguration, experimentImport*Schema incl. its legacy: boolean field)
• 155 lines of orphaned CSS for the removed markup

Consequential details

• Alliance branches are gone from world rules. allied-controller is unreachable without alliances, so it leaves both action-reason enums, and move-option controllerRelationship shrinks to ['open','self','other'].
• Turn-shaped export counters (matchingTurnCount, firstMatchingTurn, lastMatchingTurn, turnsWithUnknownCost) go with the turn records they counted. Export metrics now derive from swarmTicks + providerAttempts.
• Archive migration 6 drops the legacy tables/columns, following the package's append-only convention. failures() was re-pointed from the deleted model_attempts to provider_attempts.
• No legacy compatibility is retained. Pre-swarm exports require an older Git revision to read.
• NonCommunicationWorldEvent → PhysicalWorldEvent, which describes what it is rather than what it is not.

Preserved

Physical worker identity (id, name, color, position), infection, capture, the deterministic engine, Agent Zero, Jev, provider accounting, swarm telemetry, safe exports, and the swarm-useful archive surface. Test coverage retained for deterministic legality, simultaneous resolution, Zero planning, Jev candidate selection, pressure, captures, directive completion, attempt accounting, provider cost attribution, and export safety.

Validation

pnpm validate → pass (format, lint, typecheck, test, build). pnpm test:e2e → 2/2 pass. 222 tests across 26 files.

Known follow-ups (not in this PR)

• world-lab.tsx still has const swarmMode = true with dead !swarmMode branches (44 refs) — PR 4's headline item.
• archivedAppliedScenarioSchema retains historicalCognitionMode/historicalDecisionContractVersion incl. the string legacy-multi-agent — PR 3.
• simulation-service.ts passes [] to calculateExperimentMetrics, so live World Lab metrics read zero. Pre-existing, but swarmTicks now makes real data available.
• movementDirectionDistribution / longestRepeatedDirectionStreak / recentCellRevisits are always zero; direction is no longer recoverable without a fromCell→toCell helper.

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