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## Why Goal steering is one form of runtime-owned model context, but the old `<goal_context>` wrapper made the contextual-fragment hiding path goal-specific. Using a source-labeled internal context fragment gives core and extensions a shared shape for hidden model steering while keeping those prompts out of visible turn history. The change also keeps legacy `<goal_context>` messages recognized as hidden contextual input so existing stored history does not start rendering old goal-steering prompts as user-visible turn items. ## What Changed - Replaces `GoalContext` with `InternalModelContextFragment` plus a validated `InternalContextSource`. - Renders goal steering as `<codex_internal_context source="goal">...</codex_internal_context>`. - Updates core goal steering and `ext/goal` steering to inject the new internal-context fragment. - Updates contextual-fragment, event-mapping, goal, and session tests for the new wrapper. ## Test Coverage - Adds coverage for detecting the new internal model context fragment. - Preserves coverage for hiding legacy `<goal_context>` fragments. - Verifies invalid internal context sources are rejected and arbitrary context tags are not hidden. - Updates goal steering/session assertions to expect the new `source="goal"` wrapper.