feat(core): append model identity to system prompts via plugin - #49129
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Every model request now carries a second system part naming the model: You are powered by (/).
Implemented as an internal session-hook plugin (opencode.prompt.identity, alongside the optimize family) rather than prompt templating, so custom agent prompts are covered with no opt-in. It resolves the display name from the catalog with a ref-id fallback, hooks context/compaction/generate/title, and inserts at index 1 so family-prompt overrides of the first part preserve it. No changes to Resolved, the runner, or any shipped prompt text.
Tests: identity unit coverage, plugin registered in the runner/recorded/title setups with 3-part expectations, and a surgical cassette update. Full core suite: 5385 pass with only the 8 pre-existing shell/env failures that also fail on the base.