feat(components/execd): add new api for context management

[Pangjiping]

Summary

• see feat(specs): update execd specs for code context management #46

Testing

• Not run (explain why)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[jwx0925]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

OpenSandbox/components/execd/pkg/runtime/context.go

Lines 145 to 149 in 650ef8e

	c.defaultLanguageJupyterSessions[language] = session.ID
	c.jupyterClientMap[session.ID] = &jupyterKernel{
	kernelID: session.Kernel.ID,
	client: client,
	}

Populate language when creating default contexts

Default contexts created in createDefaultLanguageContext store a jupyterKernel without setting its language field (context.go lines 145‑149). Because list APIs use kernel.language, a prewarmed session will be reported twice—once with an empty language from jupyterClientMap and once with the actual language from defaultLanguageJupyterSessions—after the first request without an explicit context, causing duplicate and misleading entries in /code/contexts.

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