feat(config): split AgentV home and data directories

[christso]

Summary

AgentV can now use a shared home/global config.yaml without forcing every project to carry .agentv/config.yaml. Project-local YAML config still wins, and the implementation deliberately avoids merge semantics: AgentV uses the first valid project-local file, then falls back to $AGENTV_HOME/config.yaml or ~/.agentv/config.yaml.

AgentV home/config files and heavy runtime data can now be mounted separately. AGENTV_HOME controls lightweight config/home files, while AGENTV_DATA_DIR controls workspaces, subagents, trace state, dependency caches, and results clones; when AGENTV_DATA_DIR is unset, heavy data still falls back to AGENTV_HOME/~/.agentv for existing users.

Docker docs and compose defaults now show separate HOME, AGENTV_HOME, and AGENTV_DATA_DIR mounts.

Before / After Evidence

Scenario	Before	After
Global config	origin/main only searched project-local .agentv/config.yaml; $AGENTV_HOME/config.yaml was not consulted.	AGENTV_HOME=<tmp>/home agentv eval run suite.eval.yaml --dry-run --strict honors a home required_version and aborts with the expected strict-version warning.
Config/data split	origin/main kept config at ~/.agentv regardless of AGENTV_HOME, and heavy helpers only followed AGENTV_HOME.	AGENTV_HOME=/tmp/agentv-config AGENTV_DATA_DIR=/tmp/agentv-data resolves config to /tmp/agentv-config and workspaces to /tmp/agentv-data/workspaces.

Green UAT output:

Green UAT: separated config/data paths
{"config":"/tmp/agentv-config","data":"/tmp/agentv-data","workspaces":"/tmp/agentv-data/workspaces"}

Green UAT: home config required_version is honored
Warning: This project requires agentv >=999.0.0 but you have 4.31.4-next.1.
  Run `agentv self update` to upgrade.
Aborting: --strict mode requires the installed version to satisfy the required range.
exit=1

Verification

• bun test packages/core/test/paths.test.ts packages/core/test/evaluation/loaders/config-loader.test.ts
• bun test packages/core/test/evaluation/results-repo.test.ts
• bun test apps/cli/test/commands/results/serve.test.ts
• bun run build
• bun run typecheck
• docker compose -f docker-compose.yml config
• Pre-push hook on git push: build, typecheck, lint, test, validate eval YAML files

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