Fix #378: Share git-cas store factory

[flyingrobots]

What changed

Added CasStoreFactory and routed CasBlobAdapter plus CasSeekCacheAdapter through the shared CDC git-cas construction recipe.

Why

Both adapters previously duplicated dynamic git-cas loading, CBOR codec construction, chunking setup, and logger observability wiring. The adapters still own their lazy caching behavior, but the construction recipe now has one owner.

Closes #378

Validation

• npx vitest run test/unit/infrastructure/adapters/CasBlobAdapter.test.ts test/unit/infrastructure/adapters/CasSeekCacheAdapter.test.ts
• npm run typecheck:src -- --pretty false
• npx eslint src/infrastructure/adapters/CasStoreFactory.ts src/infrastructure/adapters/CasBlobAdapter.ts src/infrastructure/adapters/CasSeekCacheAdapter.ts

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dc3992ba-a075-4132-8d37-c5794058b9a1

📥 Commits

Reviewing files that changed from the base of the PR and between a21fb8b and 6b9c955.

📒 Files selected for processing (3)

• src/infrastructure/adapters/CasBlobAdapter.ts
• src/infrastructure/adapters/CasSeekCacheAdapter.ts
• src/infrastructure/adapters/CasStoreFactory.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-378-shared-cas-factory

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[github-actions]

Release Preflight

• package version: 18.0.0
• prerelease: false
• npm dist-tag on release: latest
• npm pack dry-run: passed
• jsr publish dry-run: passed

If you tag this commit as v18.0.0, release workflow will publish.

[flyingrobots]

@codex Code Lawyer Activity Summary

Issue	Severity	Source	File	Outcome
No actionable self-discovered issue found in this PR diff.	None	Self	PR diff against origin/main	No code changes made.

Validation:

Check	Result
GraphQL review-thread audit	0 unresolved, non-outdated review threads
GraphQL review audit	0 Changes Requested reviews
git diff --check origin/main...origin/fix-378-shared-cas-factory	Pass
Added hard-ban token scan	Hard-ban diff scan surfaced adapter-local unknown fields in src/infrastructure/adapters/CasStoreFactory.ts; manually inspected and accepted as infrastructure-boundary typing that does not leak into domain or ports.