feat(config): derive devcontainerId from workspace folder per spec

[skevetter]

Summary

Implements the devcontainer spec algorithm for devcontainerId variable substitution: SHA-256 hash of localWorkspaceFolder, truncated to 20 hex characters. The old label-based derivation is preserved as GetLegacyDevContainerID for backward compatibility, and a ResolveDevContainerID wrapper is provided for callers that need migration support.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8e1e7dd and 9273226.

📒 Files selected for processing (3)

• pkg/devcontainer/config.go
• pkg/devcontainer/config/substitute.go
• pkg/devcontainer/config/substitute_test.go

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