v0.27.9: Mandatory Interactive Modal Invariant, Universal Code Graph README Showcase & Smart MCP Fallback

Mandatory Interactive Modal Invariant, Universal Code Graph README Showcase & Smart MCP Fallback

• Mandatory Interactive Modal Invariant (ask_question) & Platform Planning Mode Override (harness-rules.md, AGENTS.md, pre_invocation_reminder.py):
  • Eliminated conversational chat prose and "Open Questions" sections in implementation_plan.md for missing requirements or edge cases.
  • Mandated that the Lead Agent immediately trigger the interactive ask_question modal with structured, clickable choices before authoring implementation plans.
  • Enforced explicit rule precedence overriding platform planning mode defaults that discourage calling ask_question during planning.
• Universal Code Graph Showcase in README (README.md):
  • Expanded the project README with an in-depth section on the Universal Code Graph Engine (project_graph.py).
  • Documented Clean Architecture feature slicing, dependency path finding, UI screen mapping, and 80%+ token savings with ASCII architectural flow diagrams.
• Smart Sprint Fallback in Zoho Sprints MCP Client (agents/mcp/zoho_sprints/_client.py, zoho_get_task_details.json):
  • Resolved task lookup across all sprints and the backlog even when an explicit mismatched sprint_id is supplied by the caller.
  • Updated zoho_get_task_details schema to make sprint_id optional.

Full Changelog: v0.27.8...v0.27.9