release: prepare CraftDAG v0.2.6

[madawei2699]

Summary

• bump the published CraftDAG packages for the merged curved RectRing cornerRise capability
• core 0.2.6, exporter-schem 0.2.5, importer-schem 0.2.4
• keep the unpublished CLI at 0.2.0

Validation

• pnpm test (core 180, exporter 6, importer 3, CLI 10)
• pnpm lint
• pnpm typecheck
• curved geometry stress coverage passes

The tag-triggered publish workflow should run after this release commit is merged.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Synchronize exported versions with package releases

When consumers inspect these packages for diagnostics or compatibility checks, the newly published core 0.2.6, exporter 0.2.5, and importer 0.2.4 will all still report 0.2.0 through version, exporterVersion, and importerVersion respectively. Update those exported constants (and the core assertion in bootstrap.test.ts) alongside the manifest versions so the public runtime metadata identifies the installed release correctly.

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