test: add sandbox agent test suite#183

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Ladas wants to merge 18 commits intomainfrom

feat/sandbox-a2-tests

Commits on Mar 20, 2026

test(sandbox): add tests package init
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test(sandbox): budget counter thresholds, HITL intervals, and per-step tool resets
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test(sandbox): context isolation verifying per-node message boundaries in the reasoning loop
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test(sandbox): event serializer covering all node event types, legacy aliases, and token counts
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test(sandbox): executor permission checks, HITL escalation, timeout enforcement, and workspace execution
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test(sandbox): executor tool loop covering orphaned calls, premature exits, and sub_index continuity
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test(sandbox): graph state fields, build_graph compilation, and file tool path traversal prevention
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test(sandbox): graph card event catalog completeness, metadata fields, and topology introspection
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test(sandbox): Landlock filesystem isolation using subprocess forks for irreversible syscall testing
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test(sandbox): node_visit indexing sequence and sub_index continuity across graph traversals
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test(sandbox): three-tier permission checker with deny/allow/HITL rule matching and precedence
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test(sandbox): append-only plan store with step lifecycle, subplans, and flat plan serialization
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test(sandbox): reasoning loop plan parsing, decision extraction, budget enforcement, and routing
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test(sandbox): sources.json capability loader with domain matching, registry lookup, and runtime limits
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test(sandbox): workspace manager per-context_id creation, metadata tracking, and context listing
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fix: resolve ruff lint violations — import ordering, formatting, noqa for used vars
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ci: retrigger lint checks
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style: apply ruff 0.11.4 formatting to test files
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