Support independent visualization lifecycles

[DecisionNerd]

Closes #81

Summary

• replace graph, artifact, and figure singleton panels with a shared instance registry
• correlate host/webview work by privacy-safe instance ID and monotonic render generation
• cancel superseded work, reject stale replies, dispose owned resources, and route coordination only through explicit groups
• verify multiple unsaved visualization panels remain alive independently

Validation

• npm run check
• npm run test:unit (247 passing)
• npm test (326 passing)
• npm run verify:package
• git diff --check

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📥 Commits

Reviewing files that changed from the base of the PR and between ba03ad4 and 0adda71.

📒 Files selected for processing (19)

• docs/engineering/ARCHITECTURE.md
• docs/engineering/TESTING.md
• package.json
• src/commands/projectArtifacts.ts
• src/commands/visualize.ts
• src/extension.ts
• src/test/extension.test.ts
• src/test/visualizationInstanceRegistry.test.ts
• src/views/resultTableView.ts
• src/webview/artifactVisualizationPanel.ts
• src/webview/artifactVisualizationProtocol.ts
• src/webview/figurePanel.ts
• src/webview/figureSchema.ts
• src/webview/protocol.ts
• src/webview/resultGraphPanel.ts
• src/webview/visualizationInstanceRegistry.ts
• webview-ui/src/artifactVisualization/main.ts
• webview-ui/src/figure/main.ts
• webview-ui/src/resultGraph/main.ts

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[codspeed-hq]

Merging this PR will not alter performance

✅ 27 untouched benchmarks

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_{Comparing feature/81-visualization-instance-lifecycle (0adda71) with main (ba03ad4)}