Show imports/moves in summary table; hide zero-count rows

[Copilot]

Summary

The Summary table now includes 📥 Import and 🔀 Move rows alongside the existing action rows, hides any row whose count is 0, and falls back to a "No changes" message when every row would be empty.

Changes

• SummaryModel: added Imports and Moves ActionSummary properties.
• SummaryEnrichmentStage: counts changes whose ImportId / MovedFromAddress is set (orthogonal to action buckets — a single change can appear in both an action row and an import/move row).
• SummaryRenderer: builds the row list, filters Count == 0, emits Import/Move rows, and renders the existing "No changes" paragraph when no row remains.
• Stub SummaryModel constructions in 4 test files updated for the new required properties.
• Replaced Render_SummaryTable_ShowsEmptyCellWhenNoActionResources with Render_SummaryTable_OmitsRowsWithZeroCount to lock in the new behavior.
• Regenerated snapshots (SNAPSHOT_UPDATE_OK); refactoring-comprehensive.md and comprehensive-demo.md now expose the new rows.
• docs/features.md: replaced the "No-Changes Summary" section with a "Concise Summary Table" section covering both behaviors.
• Added release notes at docs/issues/121-summary-table-imports-moves/release-notes.md.

Example (plan with adds, imports, and moves)

## Summary

| Action | Count | Resource Types |
| -------- | ------- | ---------------- |
| ➕ Add | 2 | 1 azurerm_resource_group<br/>1 azurerm_virtual_network |
| 📥 Import | 2 | 1 azurerm_resource_group<br/>1 azurerm_storage_account |
| 🔀 Move | 1 | 1 azurerm_virtual_network |
| **Total** | **2** | |

Total semantics are unchanged (add + change + destroy + replace), so ProgramEntry's tfplan2md_haschanges pipeline variable is unaffected.

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Checklist

• All checks pass (build, test, lint)
• Commits follow Conventional Commits
• PR description uses the standard template (Problem / Change / Verification)

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[oocx]

@copilot release notes are missing

[Copilot]

@copilot release notes are missing

Added release notes at docs/issues/121-summary-table-imports-moves/release-notes.md in 435b1f8.

[github-actions]

Test Results

1 254 tests   1 254 ✅  1m 46s ⏱️
    1 suites      0 💤
    1 files        0 ❌

Results for commit 435b1f8.

[github-actions]

Code Coverage Summary

Metric	Coverage	Threshold	Status
Line	89.02%	84.48%	✅ Pass
Branch	79.24%	72.80%	✅ Pass

Coverage report artifact