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+# RD-15 — Remove the 22 abandoned agent worktrees
+
+Status: done
+Source: PLAN.md 2.1
+
+## Why
+
+`.claude/worktrees/` holds **22 abandoned agent checkouts totalling 4.7 GB**, left behind by
+past agent runs. They are gitignored (`.gitignore:64`), so they never reach a commit — but
+they are on disk, and every unqualified repository-wide `grep -r` or `find` walks all 22
+copies of the source tree.
+
+That is a real tax on every future search, by a person or an agent, and it is larger than it
+looks. Measured:
+
+|                                  | files      |
+| -------------------------------- | ---------- |
+| under `.claude/worktrees/`       | **48,005** |
+| tracked in the actual repository | **856**    |
+
+An unqualified `grep -r` or `find` therefore walks **56× more files than the repository
+contains**. This ticket removes the cause; the `git grep` habit in the ticket-authoring rules
+above handles the symptom.
+
+## Read first
+
+- `.gitignore:64` — confirms the directory is ignored
+- `git worktree list` — 23 entries: the main working tree plus the 22 to remove
+- The verification block below. **Run it before removing anything.**
+
+## Decisions (pre-made, don't relitigate)
+
+1. **Use `git worktree remove`, never `rm -rf`.** These are **live registered git
+   worktrees**, not orphaned directories — each has a real `worktree-agent-<hex>` branch. An
+   `rm -rf` leaves 22 broken registrations behind in `.git/worktrees/`, which is worse than
+   the disk usage. This correction was made while executing RD-01, where the original plan
+   assumed they were plain directories.
+
+2. **Delete each `worktree-agent-*` branch too**, after removing its worktree. A worktree
+   removal does not delete the branch it had checked out, and 22 stale branches in
+   `git branch` are their own kind of noise.
+
+3. **Finish with `git worktree prune`** to clear any leftover administrative entries.
+
+4. **Re-verify before removing, even though it was verified when this ticket was written.**
+   This is the only destructive ticket in the arc. Both gates passed at authoring time — all
+   22 branch tips are ancestors of `main` (the RB-01..RB-33 arc was merged in `637d500`), and
+   all 22 working trees are clean. **If either gate fails for any worktree, stop and report
+   it; do not use `--force`.**
+
+5. **This ticket changes no tracked file.** Its commit contains only this ticket file and the
+   README row. That is correct and expected — the work is entirely in gitignored paths and
+   local branch refs.
+
+## Files
+
+- `docs/project/readable-codebase/RD-15-remove-abandoned-worktrees.md` (this file)
+- `docs/project/readable-codebase/README.md` (the RD-15 row)
+
+No source files. No configuration. `.gitignore` is already correct and must not change.
+
+## Steps
+
+1. Run the verification block below. Do not proceed unless it reports `unmerged: 0` and
+   `dirty: 0`.
+2. For each worktree: `git worktree remove .claude/worktrees/<name>`.
+3. For each branch: `git branch -d worktree-agent-<hex>` (lowercase `-d`, which refuses to
+   delete anything unmerged — that is a second safety net, so do **not** use `-D`).
+4. `git worktree prune`.
+5. Confirm `.claude/worktrees/` is gone or empty.
+6. Update this ticket's `Status:` to `done` and the README's RD-15 row to `done`.
+7. Commit.
+
+## The verification gate — run this first
+
+```bash
+cd /home/eho/repos/atomic-design-poc
+unmerged=0
+for b in $(git branch --list 'worktree-agent-*' --format='%(refname:short)'); do
+  git merge-base --is-ancestor "$(git rev-parse "$b")" main 2>/dev/null \
+    || { echo "UNMERGED: $b"; unmerged=$((unmerged+1)); }
+done
+dirty=0
+for d in .claude/worktrees/agent-*; do
+  [ -d "$d" ] || continue
+  out=$(git -C "$d" status --porcelain 2>/dev/null | grep -v '^?? node_modules')
+  [ -z "$out" ] || { echo "DIRTY: $(basename "$d")"; dirty=$((dirty+1)); }
+done
+echo "unmerged: $unmerged  dirty: $dirty"
+```
+
+Expected, and what was measured when this ticket was written: `unmerged: 0  dirty: 0`.
+
+## Acceptance criteria
+
+```bash
+git worktree list | wc -l                              # MUST be 1 (the main tree only)
+git branch --list 'worktree-agent-*' | wc -l           # MUST be 0
+ls .claude/worktrees 2>/dev/null | wc -l               # MUST be 0
+du -sh .claude 2>/dev/null                             # was 4.7G under worktrees/
+```
+
+The repository is still intact — this is the check that matters after a destructive step:
+
+```bash
+git status --short        # only the two doc files
+git log --oneline -1      # HEAD unchanged from before your removals
+npm run ci                # exits 0
+```
+
+Show the payoff, since it is the reason for the ticket:
+
+```bash
+find .claude/worktrees -type f 2>/dev/null | wc -l   # was 48005 -> MUST be 0
+git ls-files | wc -l                                  # unchanged: 856 tracked files
+```
+
+## Verification
+
+`npm run ci`. No source file changes, so `--full` is not required — but run plain `ci` anyway,
+because removing worktrees touches `.git` administrative state and the point is to prove the
+repository is unharmed.
+
+## Out of scope
+
+- `.gitignore` — already correct at line 64.
+- Any worktree that fails a gate. Report it instead (decision 4).
+- Preventing future accumulation. Worth doing, but it is a change to how agents are launched,
+  not a cleanup, and no ticket covers it yet. Note it as a follow-up.
+
+## Risks
+
+- **This is the arc's only destructive ticket.** The two gates in decision 4 are what make it
+  safe. Run them, and stop on any failure.
+- **`git branch -d`, never `-D`.** Lowercase refuses unmerged branches, which duplicates the
+  first gate at the moment of deletion. If `-d` refuses a branch, that branch has commits not
+  in `main` — stop and report it.
+- **`git worktree remove` refuses a dirty worktree** unless forced. Do not force. A refusal
+  means the second gate missed something.
+- **Do not delete `node_modules` anywhere else** while cleaning up. The verification block
+  deliberately ignores untracked `node_modules` inside a worktree, because that is build
+  output, not work.
diff --git a/docs/project/readable-codebase/README.md b/docs/project/readable-codebase/README.md
index a2f9559..726fcf0 100644
--- a/docs/project/readable-codebase/README.md
+++ b/docs/project/readable-codebase/README.md
@@ -109,7 +109,7 @@ two. Note that RD-15 exists because 22 abandoned agent worktrees are still on di
 | RD-12 | `ActionState` becomes `action` on `BriefState.Loaded`                        | 11         |           | done   |
 | RD-13 | Same for org-template, folding `pendingPublish` in                           | 12         |           | done   |
 | RD-14 | Move `SaveState` to `debounced-save.ts`; delete `action-state.ts`            | 13         |           | done   |
-| RD-15 | Remove 22 abandoned agent worktrees (4.7 GB)                                 | 01         |           | todo   |
+| RD-15 | Remove 22 abandoned agent worktrees (4.7 GB)                                 | 01         |           | done   |
 | RD-16 | `parseDashboardView` returns `BigProfile`; delete `DashboardView`            | 01         |           | todo   |
 | RD-17 | `successOf`/`successOr` sweep — 10 sites, 8 files                            | 01         |           | todo   |
 | RD-18 | Ticket-reference sweep, frontend — 181 refs, 100 files                       | 01         |           | todo   |