Housekeeping: close/update GitHub issues already implemented

[freshtonic]

Goal

Reconcile the issue tracker with what's actually implemented, once the work merges.

Implemented (on branch tui-editor-design)

The whole git queue tui feature is built, tested, and committed on
tui-editor-design:

• git queue tui — interactive queue/history editor (TUI) #1 — git queue tui (parent / PRD) — delivered in full.
• tui 1/8: engine scaffold, git queue tui command & guards #2 — tui 1/8: engine scaffold, command & guards.
• tui 2/8: read-only three-pane view & navigation #3 — tui 2/8: read-only three-pane view & navigation.
• tui 3/8: boundary edits, undo/redo, quit-guard & exit #4 — tui 3/8: boundary edits, undo/redo, quit-guard & exit.
• tui 4/8: reorder + conflict escape hatch (resolve/undo, suspend/resume) #5 — tui 4/8: reorder + conflict escape hatch.
• tui 5/8: reword (editable message pane, explicit-apply) #6 — tui 5/8: reword.
• tui 6/8: delete + empty-commit handling & branch dissolve #7 — tui 6/8: delete + empty-commit handling & branch dissolve.
• tui 7/8: squash (adjacent + cross-boundary, jj identity) #8 — tui 7/8: squash.
• tui 8/8: split — line-level interactive selector, two-way repeated #9 — tui 8/8: split.

When tui-editor-design merges to main, close #2–#9 and #1, cross-linking the
implementing commits/PR. Note deltas from the original tickets:

• Reorder idiom changed from live J/K to pick-up/place with Space (one
  rebase instead of one per keystroke).
• add-boundary semantics were corrected to match git queue edit (highlighted
  commit becomes the new branch's front).
• Known limitation: an empty-subject commit at the very tip is invisible to
  the model (git log trailing-tab trim); mid-line empties work.

Not implemented (leave open)

• sync --ping-reviewers: re-request reviews on locally-changed PRs #10 — sync --ping-reviewers.
• Windows portability: cross-platform RNG and home-directory lookup #11 — Windows portability.

Task

• After merge, close git queue tui — interactive queue/history editor (TUI) #1–tui 8/8: split — line-level interactive selector, two-way repeated #9 with references to the commits/PR.
• Add a short implementation note to each where behaviour diverged from the ticket.
• Confirm sync --ping-reviewers: re-request reviews on locally-changed PRs #10 and Windows portability: cross-platform RNG and home-directory lookup #11 remain open.