feat: canonical workspace.mode + workspace.path model

[christso]

Summary

• canonicalize workspace config to workspace.mode (pooled|temp|static) + workspace.path
• remove legacy CLI workspace controls and keep only --workspace-mode / --workspace-path
• enforce precedence and validation rules from feat: workspace.static soft override with env-var fallback #514 (path implies static, conflicts hard-error, static requires path)
• hard-reject removed legacy fields: workspace.static_path, workspace.pool, and target-level workspace_template
• update tests and regenerate eval schema reference
• fix examples/features/workspace-setup-script to install plugin via plugins in workspace config using a project-scoped marketplace

Validation

• pre-push hooks: build, typecheck, lint, test all passed
• focused CLI/core behavior checks for workspace flags and mode/path semantics

Manual E2E (2026-03-10)

• agentv eval --help
  • shows only --workspace-mode and --workspace-path
  • legacy flags absent: --keep-workspaces, --cleanup-workspaces, --retain-on-success, --retain-on-failure, --pool-workspaces, --no-pool, --workspace-clean, --workspace
• agentv eval examples/features/rubric/evals/dataset.eval.yaml --dry-run --workspace-path /tmp --workspace-mode temp
  • fails with: --workspace-path requires --workspace-mode=static (or omit --workspace-mode)
• agentv eval examples/features/rubric/evals/dataset.eval.yaml --dry-run --workspace-path /tmp
  • succeeds (Total tests: 5)
• temp eval YAML with only:
  • workspace.path: /tmp
  • succeeds (Total tests: 1) showing YAML path implies static mode
• temp eval YAML with:
  • workspace.mode: static and no workspace.path
  • fails with: workspace.mode=static requires workspace.path or --workspace-path
• temp eval YAML with removed field:
  • workspace.static_path
  • fails with: workspace.static_path has been removed. Use workspace.path with workspace.mode=static.
• temp eval YAML with removed field:
  • workspace.pool: true
  • fails with: workspace.pool has been removed. Use workspace.mode='pooled' or 'temp'.

Manual E2E: workspace-setup-script example (2026-03-10)

• agentv eval examples/features/workspace-setup-script/evals/dataset.eval.yaml --dry-run --target copilot
  • exit 0
  • setup hook output confirms:
    • initial workspace init run
    • allagents plugin marketplace add <...>/examples/features/workspace-setup-script/marketplace --scope project
    • allagents workspace sync
    • plugin my-plugin@workspace-setup-script-marketplace synced
• agentv eval examples/features/workspace-setup-script/evals/dataset-vscode.eval.yaml --dry-run --target vscode
  • exit 0
• required artifacts check in setup hook passed for:
  • AGENTS.md
  • .github/prompts/summarize-repo.prompt.md

Closes #514

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