宜博 / lemonboss

hire() now checks system_agents (source_kind='template') before provisioning a new
company agent: if the role has a shared template row, skip copying agent.md and
instead let AgentManager.getAgentConfig()/PromptBuilder.build() resolve the prompt
from the shared legacy_path at call time, with per-company context assembled from a
new company-context.md. Roles without a template row (including the 6 ids that exist
in both system/agents/ and system/templates/, e.g. evolver-youtube-crawler) fall back
to the existing full-copy behavior unchanged.

- server/services/graph-service.js (new): lookupSharedAgentMd(), upsertOrgGraphNode()
- server/services/company-service.js: hire() reference-mode branch, _provisionReferenceAgent()
- server/src/core/agent-manager.js: getAgentConfig() resolves prompt/companyContextPath
- server/src/core/prompt-builder.js: build() concatenates company-context.md
- unit + integration tests covering all 6 acceptance criteria from
  docs/todo/system-design/27-p1-virtual-reference.md §6, including a regression test
  against the real idearun:evolver-youtube-crawler naming-collision case

Full regression suite (587 tests) passes; independent adversarial review found 0
blocking/major issues.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Adds server/services/graph-db.js (new data/graph.sqlite: system_agents,
org_graph_nodes, org_graph_edges) and graph-seed-service.js, which scans
system/agents/, system/templates/, and data/companies/*/company.json into
seed rows without touching company-service.js's existing hire/copy path.

Real repo data diverged from the design doc's original estimates (8 not 10
global agents; 39 not 34 template dirs; system/agents/ and system/templates/
turn out to share 6 ids describing the "same" agent from two different
files) — documented in docs/todo/system-design/27-graph-agent-architecture.md
section 7 for P1/P2 to resolve.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>