Why: cmd_finish ran git submodule deinit --all, but submodule.<name>.url entries live in the shared .git/config — finishing any task silently marked every other checkout and worktree uninitialized (observed twice on 2026-09-30: main checkout uninit=12 after each finish; a parallel session hit it minutes before this fix landed). The deinit serves no purpose: worktree removal with gitlinks is refused regardless, so cleanup already goes through rm -rf + prune. Also aligns AGENTS.md with observed hook behavior (post-merge fires on ff-only pulls too, and its inline close cannot see cards merged remotely until they are pulled), and ignores the ZCode-generated .zcodeignore that tripped the BUSY gate in every session.
Evidence: bash -n clean; abandon-path smoke of the patched script — start + FORCE_ABANDON=1 finish of a throwaway branch left shared submodule url config at 12 entries (pre-fix: 0), main checkout submodule status uninit=0, smoke worktree and branch fully recycled; the smoke close also backfilled a parallel session card left open (gitea-access-facts) via a card-close branch, proving the fallback path.
Impact: scripts/task.sh cmd_finish only (removes one line, updates comment), AGENTS.md card-close paragraph, .gitignore one entry. No product or gitlink change; make test not applicable (repo-level tooling/docs only). web_base default fix intentionally withdrawn from this PR — landed via parallel PR #73.
Refs: .task/fix-task-finish-close-followups.md
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