Orphaned-flow plan written, PR opened.

[github-actions]

Lane C — Orphaned Flow Implementation Plan: Complete

Task: Plan-only — inspect graph/flow implementation and write implementation plan for orphaned-flow diagnostic.

Lane: docs (file family docs/proposals/)

Branch: opencode/issue91-20260626145921

Commit: 318fce7

Files changed:

• docs/proposals/Orphaned-Flow-Implementation-Plan.md (new, +262 lines)

Summary:

• Researched existing codebase: graph.ts, flow.ts, runtime.ts, screen.ts, core tests
• Found surfaced-node-not-in-any-flow already implemented; orphaned-flow and flow-step-not-surfaced are still pending
• Wrote comprehensive implementation plan covering: algorithm, implementation steps, 5 test cases, edge cases (empty flows, zero surfaces), interaction with existing diagnostics, and open questions
• Validation: pnpm lint ✅, pnpm changeset status ✅ (no packages bumped)

Blockers: None

Merge policy: PR opened only, do not auto-merge (per issue instructions)

Closes #91

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