prototype: declarative runtime-compiled workflows

[eshulman2]

Summary

• add a strict YAML/JSON format for composing allowlisted Forge nodes and state profiles
• store canonical workflow definitions in Jira project properties and select them with forge:workflow:<name> labels
• compile definitions into LangGraph graphs at runtime with topology, cycle, size, and transition safeguards
• support revision-aware checkpoint adoption and explicit resume-node mappings
• add workflow validate/publish/show/list/delete CLI commands and documentation

Prototype boundaries

• existing Python-built workflows remain the fallback
• arbitrary imports, custom Python, expressions, and external resources are not supported
• only registered Forge nodes and routers are available
• project administrators author definitions through Jira permissions; issue editors select them by label

Verification

• uv run ruff check src tests/unit/workflow/test_declarative_workflows.py
• uv run pytest -q tests/unit/workflow/test_declarative_workflows.py tests/unit/orchestrator/test_worker.py tests/unit/test_cli_config.py (117 passed)
• uv run pytest -q tests/unit (2217 passed before rebasing; focused suite rerun after updating main)
• uv run zensical build

Follow-up

A local test pass with a disposable Jira project and Redis checkpoint store is planned before this leaves draft.

[eshulman2]

Stacked follow-up for layered planning state: eshulman2#6

[eshulman2]

The layered-planning follow-up is now stacked in this repository as #318. The earlier fork-only PR has been closed.