[codex] Add tool display metadata helpers

[senamakel]

Summary

• add provider-neutral tool display metadata for labels/details outside model-visible schemas
• add default display label/detail helpers on Tool using humanized names and common argument keys
• add richer ToolTimeout semantics while preserving existing timeout_ms policy metadata

Validation

• cargo fmt --check
• timeout 180s cargo clippy --all-targets -- -D warnings
• timeout 120s cargo test display_
• timeout 120s cargo test tool_policy_deserializes_without_display_metadata
• timeout 120s cargo test timeout_policy_uses_richer_timeout_semantics

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📥 Commits

Reviewing files that changed from the base of the PR and between e72036d and 56c139e.

📒 Files selected for processing (3)

• src/harness/tool/mod.rs
• src/harness/tool/test.rs
• src/harness/tool/types.rs

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