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doc/experimental/issue-worktree-support.md

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+# Issue worktree support
+
+Status: experimental, runtime-only, not shipping as a user-facing feature yet.
+
+This branch contains the runtime and seeding work needed for issue-scoped worktrees:
+
+- project execution workspace policy support
+- issue-level execution workspace settings
+- git worktree realization for isolated issue execution
+- optional command-based worktree provisioning
+- seeded worktree fixes for secrets key compatibility
+- seeded project workspace rebinding to the current git worktree
+
+We are intentionally not shipping the UI for this yet. The runtime code remains in place, but the main UI entrypoints are hard-gated off for now.
+
+## What works today
+
+- projects can carry execution workspace policy in the backend
+- issues can carry execution workspace settings in the backend
+- heartbeat execution can realize isolated git worktrees
+- runtime can run a project-defined provision command inside the derived worktree
+- seeded worktree instances can keep local-encrypted secrets working
+- seeded worktree instances can rebind same-repo project workspace paths onto the current git worktree
+
+## Hidden UI entrypoints
+
+These are the current user-facing UI surfaces for the feature, now intentionally disabled:
+
+- project settings:
+  - `ui/src/components/ProjectProperties.tsx`
+  - execution workspace policy controls
+  - git worktree base ref / branch template / parent dir
+  - provision / teardown command inputs
+
+- issue creation:
+  - `ui/src/components/NewIssueDialog.tsx`
+  - isolated issue checkout toggle
+  - defaulting issue execution workspace settings from project policy
+
+- issue editing:
+  - `ui/src/components/IssueProperties.tsx`
+  - issue-level workspace mode toggle
+  - defaulting issue execution workspace settings when project changes
+
+- agent/runtime settings:
+  - `ui/src/adapters/runtime-json-fields.tsx`
+  - runtime services JSON field, which is part of the broader workspace-runtime support surface
+
+## Why the UI is hidden
+
+- the runtime behavior is still being validated
+- the workflow and operator ergonomics are not final
+- we do not want to expose a partially-baked user-facing feature in issues, projects, or settings
+
+## Re-enable plan
+
+When this is ready to ship:
+
+- re-enable the gated UI sections in the files above
+- review wording and defaults for project and issue controls
+- decide which agent/runtime settings should remain advanced-only
+- add end-to-end product-level verification for the full UI workflow