feat: add native /goal foundation - #32924

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Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
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Based on my search, I found one potentially related PR:

Related PR

feat(session): native per-session goals with /goal and autonomous pursuit (PR #32743)

This PR appears to address similar functionality around native goal support with the /goal command. It may be addressing the same feature area or a precursor/related implementation. This should be reviewed to ensure there's no overlap or conflict with PR #32924.

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Thanks for opening this. I have a related PR open at #32743 for native per-session goals with /goal, prompt injection, compaction preservation, HTTP/SDK routes, a model-facing goal tool, and an autonomous pursuit loop.\n\nFrom a quick read, this PR seems complementary, but the architectural boundaries differ:\n\n- #32743 treats goals as per-session runtime state, persisted in the existing DB and exposed through session APIs.\n- #32924 treats goals as workspace-local planning state under .opencode/goals, with richer plan/evidence/checkpoint/log abstractions.\n\nI think the best consolidation path may be:\n\n1. Keep one canonical /goal command surface.\n2. Decide whether the first merged persistence model should be session DB, workspace files, or a layered model.\n3. Potentially split the reusable pieces here into smaller PRs: state machine/domain types, evidence/checkpoint abstractions, logs/history rendering, and verifier/planner/executor skeletons.\n4. Preserve #32743's prompt injection, compaction preservation, API/SDK routes, and model-facing completion tool if maintainers want autonomous pursuit.\n\nHappy to coordinate and adapt #32743 depending on which direction maintainers prefer.

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