feat(plugin-native): wire DEFAULT_CALL_TIMEOUT / set_call_timeout to user config

[staging-devin-ai-integration]

Context

DEFAULT_CALL_TIMEOUT (5 minutes) is hard-coded in wrapper.rs and set_call_timeout exists on LoadedNativePlugin but nothing calls it. Every plugin runs with the same default.

Proposed

Wire call_timeout through user configuration — either:

• Per-plugin setting in pipeline YAML (e.g. timeout: 600s)
• Server-level config with per-plugin override

References

• crates/plugin-native/src/wrapper.rs lines 121-123 (TODO comment)
• crates/plugin-native/src/lib.rs line 311 (set_call_timeout)
• PR feat(plugin-sdk): FFI panic guards, RAII call guard, timeout, provenance, worker thread, v9 wire bump #353 (host resiliency hardening)