Lane B plan done.

[github-actions]

All tasks complete. Here's the report:

Task:       Lane B — flow-step-not-surfaced implementation plan
Lane:       docs (plan-only)
Branch:     lane-b-flow-step-not-surfaced-plan (auto)
PR:         (auto-created by infrastructure)
Files changed:
  + docs/proposals/Flow-Step-Not-Surfaced-Implementation-Plan.md
Summary:    Implementation plan written. It covers:
            - Extending GraphDiagnostic with flowNodeId/flowSemanticNodeId
            - New diagnostic logic in computeDiagnostics() (flow-step-not-surfaced, severity: warning)
            - Semantic enrichment in inspectScreen()
            - 8 test cases in core.test.ts
            - Algorithm detail, interaction table, and validation steps
CI status:  Lint passed, changeset status shows no changesets needed
Blockers:   None
Merge order: N/A (plan-only, no auto-merge per issue notes)

Closes #90

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