Add workr::RunProject for multi-phase workflow orchestration

[jwildfire]

Summary
Implement workr::RunProject() to run multiple workflow phase folders in sequence while sharing one lData object.

Proposed signature
RunProject(strPath, lData = NULL, lConfig = NULL, strPhases = NULL, bRecursive = FALSE, bReturnResult = TRUE, bKeepInputData = FALSE, strResultNames = c("Type", "ID"))

Implementation plan

1. Validate strPath exists and discover phase folders.
2. Resolve phase order: use strPhases when provided, otherwise sorted subdirectories.
3. For each phase: load workflows via MakeWorkflowList(strPath = file.path(strPath, phase), strPackage = NULL, bRecursive = bRecursive).
4. Run each phase via RunWorkflows() using current lData.
5. Carry forward outputs to downstream phases and keep per-phase results.
6. Return either final result or structured object with phase results and final lData; document behavior clearly.

Error handling and logging

• Fatal on missing strPath or missing requested phases.
• Warn on empty phase folder.
• Log phase start/end with workflow counts.

Tests

• Phase execution order.
• strPhases subset and custom order.
• Data handoff between phases.
• Return contract for bReturnResult and bKeepInputData.
• Empty/missing phase behavior.

Acceptance criteria

• Exported RunProject() with roxygen docs and man page.
• Unit tests pass.
• README RunProject section updated after implementation.

[jwildfire]

Leaving open with #23 until full implementation in v1.1