diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/SKILL.md b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/SKILL.md
new file mode 100644
index 0000000..303716c
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/SKILL.md
@@ -0,0 +1,14 @@
+---
+name: dependabot-cleanup
+description: Validate, merge, and clean up open Dependabot PRs on Argos (Angular upgrades excluded). Use when asked to go through, merge, or clean up Dependabot PRs.
+---
+
+Run the scripts from the workspace root. Don't write gh, git, npm or cargo commands yourself, and read a log only when a step fails.
+
+1. `bash scripts/list.sh` lists the PRs.
+2. Run `bash scripts/validate.sh <pr>` for each PR, in the background. Show the user a table of the results.
+3. After the user approves, run `bash scripts/merge.sh <pr>...`.
+4. If a PR is blocked by CI, run `bash scripts/ci.sh <pr>`.
+   - If develop has the same failure, draft a ticket (`create-ticket`) and fix it first.
+   - Once develop has the fix, run `bash scripts/rebase.sh <pr>`, then `merge.sh` again.
+5. Ask the user which PRs to clean up, then run `bash scripts/cleanup.sh <pr>...`.
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/ci.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/ci.sh
new file mode 100755
index 0000000..311c7c7
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/ci.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# ci.sh <pr>: why a PR's CI is red. Prints each failing check, the step and first error lines of each failing job
+# (gates skipped), how far develop has moved since the PR's base, and develop's latest result per
+# workflow. A failure develop shares, or one develop has fixed since, is not the PR's.
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+pr=${1:?usage: ci.sh <pr>}
+branch=$(pr_branch "$pr")
+checks=$(gh pr checks "$pr" -R "$R" --json name,bucket,link -q '.[] | select(.bucket == "fail") | "\(.name)\t\(.link)"' || true)
+[ -n "$checks" ] || { echo "#$pr no failing checks" && exit 0; }
+while IFS=$'\t' read -r name link; do echo "FAIL $name $link"; done <<<"$checks"
+# gate jobs only repeat another job's result, so show the jobs they gate (the rest if all are gates)
+jobs=$(grep -v -- $'-gate\t' <<<"$checks" || true) && jobs=${jobs:-$checks}
+while IFS=$'\t' read -r name link; do
+  echo "--- $name"
+  job=${link##*/}
+  gh run view -R "$R" --job "$job" --log-failed 2>/dev/null | cut -f3- | sed -E 's/^[0-9T:.-]+Z //' |
+    awk '/##\[group\]Run / { step = $0; n = 0; next } /##\[error\]/ { print step; for (i = 0; i < n; i++) print m[i]; print; exit }
+         tolower($0) ~ /error|fail|panick/ && $0 !~ /^npm error *$/ && n < 10 { m[n++] = $0 }' | cut -c1-200
+done <<<"$jobs"
+g() { git -C "$DELPHI_REPOS/argos" "$@"; }
+g fetch -q origin develop "$branch"
+echo "--- develop is $(g rev-list --count "$(g merge-base origin/develop "origin/$branch")..origin/develop") commits past this PR's base"
+gh run list -R "$R" -b develop -L 20 --json workflowName,conclusion \
+  -q 'unique_by(.workflowName)[] | "develop \(.workflowName): \(.conclusion)"'
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/cleanup.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/cleanup.sh
new file mode 100755
index 0000000..b3f2af2
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/cleanup.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# cleanup.sh <pr>...: for each merged or closed Dependabot PR, remove worktrees/argos/<its branch>,
+# the local branch and the branch on GitHub, then empty folders left under worktrees/argos/.
+# Refuses open PRs. Prints one line per PR.
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+[ $# -gt 0 ] || { echo "usage: cleanup.sh <pr>..." >&2 && exit 2; }
+g() { git -C "$DELPHI_REPOS/argos" "$@"; }
+for pr in "$@"; do
+  read -r state branch author < <(gh pr view "$pr" -R "$R" --json state,headRefName,author -q '"\(.state) \(.headRefName) \(.author.login)"')
+  case $author in *dependabot*) ;; *) echo "#$pr skipped: author is $author" && continue ;; esac
+  [ "$state" != OPEN ] || { echo "#$pr skipped: still open" && continue; }
+  wt=$DELPHI_WORKTREES/argos/$branch
+  [ ! -d "$wt" ] || g worktree remove --force "$wt"
+  g branch -q -D "$branch" 2>/dev/null || true
+  gh api -X DELETE "repos/$R/git/refs/heads/$branch" >/dev/null 2>&1 && remote="remote deleted" || remote="no remote branch"
+  echo "#$pr cleaned $branch ($remote)"
+done
+find "$DELPHI_WORKTREES/argos/dependabot" -name .DS_Store -delete 2>/dev/null || true
+find "$DELPHI_WORKTREES/argos/dependabot" -depth -type d -empty -delete 2>/dev/null || true
+g worktree prune && g fetch -q --prune origin
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/lib.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/lib.sh
new file mode 100644
index 0000000..df87ac4
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/lib.sh
@@ -0,0 +1,8 @@
+# lib.sh: sourced by dependabot-cleanup's scripts. Sets R (the Argos repo on GitHub), loads the
+# workspace layout from $DELPHI_ROOT, and puts each PR's logs in $LOGS/<pr>/.
+# shellcheck shell=bash source=/dev/null
+. "${DELPHI_ROOT:?unset: start the session at the workspace root, on Delphi 0.2.0+ (pull its ws/ branch), or source <root>/.delphi/paths.sh}/.delphi/paths.sh"
+R=Northeastern-Electric-Racing/Argos
+LOGS=${TMPDIR:-/tmp} && export LOGS=${LOGS%/}/argos-dependabot
+# pr_branch <pr>: the PR's head branch
+pr_branch() { gh pr view "$1" -R "$R" --json headRefName -q .headRefName; }
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/list.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/list.sh
new file mode 100755
index 0000000..129d9d1
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/list.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# list.sh: open Dependabot PRs on Argos, Angular upgrades left out (they need their own migration
+# work). Prints one line per PR: #<n> <ecosystem> <branch> <title>.
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+gh pr list -R "$R" --author app/dependabot --state open --limit 100 --json number,headRefName,title \
+  -q '.[] | select((.title + .headRefName) | test("angular"; "i") | not)
+       | "#\(.number) \(.headRefName | split("/")[1]) \(.headRefName) \(.title)"'
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/merge.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/merge.sh
new file mode 100755
index 0000000..573dfc1
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/merge.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# merge.sh <pr>...: for each Dependabot PR in turn, approve it as you, wait for CI, and merge it
+# (merge commit). Waits out GitHub's UNKNOWN mergeability after the previous merge. Prints one line
+# per PR: merged, or blocked <why>; exits 1 if any is blocked.
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+[ $# -gt 0 ] || { echo "usage: merge.sh <pr>..." >&2 && exit 2; }
+rc=0
+for pr in "$@"; do
+  blocked() { echo "#$pr blocked: $1" && rc=1; }
+  author=$(gh pr view "$pr" -R "$R" --json author -q .author.login)
+  case $author in *dependabot*) ;; *) blocked "author is $author, not Dependabot" && continue ;; esac
+  gh pr review "$pr" -R "$R" --approve -b "Validated locally (dependabot-cleanup)." >/dev/null 2>&1 || true
+  if ! gh pr checks "$pr" -R "$R" --watch --fail-fast >/dev/null 2>&1; then blocked "CI failing (ci.sh $pr)" && continue; fi
+  state=UNKNOWN
+  for _ in $(seq 20); do
+    state=$(gh pr view "$pr" -R "$R" --json mergeable -q .mergeable)
+    [ "$state" = UNKNOWN ] || break
+    sleep 5
+  done
+  case $state in
+    MERGEABLE) if out=$(gh pr merge "$pr" -R "$R" --merge 2>&1); then echo "#$pr merged"; else blocked "${out##*$'\n'}"; fi ;;
+    CONFLICTING) blocked "conflicts with develop (rebase.sh $pr)" ;;
+    *) blocked "mergeable still $state" ;;
+  esac
+done
+exit $rc
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/rebase.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/rebase.sh
new file mode 100755
index 0000000..a83e1a7
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/rebase.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# rebase.sh <pr>...: ask Dependabot to rebase each PR onto develop, so CI reruns with develop's fixes
+# (rerunning a check reuses the old merge commit).
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+[ $# -gt 0 ] || { echo "usage: rebase.sh <pr>..." >&2 && exit 2; }
+for pr in "$@"; do gh pr comment "$pr" -R "$R" -b "@dependabot rebase" >/dev/null && echo "#$pr rebase requested"; done
diff --git a/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/validate.sh b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/validate.sh
new file mode 100755
index 0000000..0203042
--- /dev/null
+++ b/software/application-software/argos/workspaces/argos-dev/.claude/skills/dependabot-cleanup/scripts/validate.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# validate.sh <pr>: check a Dependabot PR locally in worktrees/argos/<its branch> (made or reset to
+# the PR's head). The diff may only touch manifests, lockfiles and workflows; then it runs CI's
+# checks for each folder whose manifest changed: angular-client (npm ci, build, tests, lint,
+# prettier) or scylla-server (build, clippy, unit tests; integration tests need Postgres, so CI runs
+# them). Prints one line, PASS or FAIL <step>, with its log; exits 1 on FAIL.
+set -euo pipefail
+# shellcheck source=lib.sh
+. "$(dirname "$0")/lib.sh"
+pr=${1:?usage: validate.sh <pr>}
+branch=$(pr_branch "$pr")
+log=$LOGS/$pr && rm -rf "$log" && mkdir -p "$log"
+wt=$(bash "$DELPHI_ROOT/.delphi/new-worktree.sh" argos "$branch")
+fail() { echo "#$pr FAIL $1 log=$log${2:+/$2.log}" && exit 1; }
+[ -z "$(git -C "$wt" status --porcelain)" ] || fail "worktree has local changes ($wt)"
+git -C "$wt" fetch -q origin develop "$branch" && git -C "$wt" reset -q --hard "origin/$branch" # Dependabot force-pushes
+
+files=$(git -C "$wt" diff --name-only origin/develop...HEAD)
+other=$(echo "$files" | grep -Ev '(^|/)(package(-lock)?\.json|Cargo\.(toml|lock))$|^\.github/workflows/' || true)
+[ -z "$other" ] || fail "scope: touches $(echo "$other" | paste -sd, -)"
+
+run() { # run <step> <dir> <cmd...>: log to $log/<step>.log, fail on error
+  local step=$1 dir=$2 && shift 2
+  (cd "$wt/$dir" && "$@") >"$log/$step.log" 2>&1 || fail "$step" "$step"
+}
+ran=""
+for dir in $(echo "$files" | grep -E '(package(-lock)?\.json|Cargo\.(toml|lock))$' | xargs -n1 dirname | sort -u); do
+  case $dir in
+    angular-client)
+      run npm-ci "$dir" npm ci
+      run ng-build "$dir" npm run build
+      run ng-test "$dir" npm run test:ci
+      run ng-lint "$dir" npm run lint -- --max-warnings=0
+      run prettier "$dir" npm run prettier-check ;;
+    scylla-server)
+      run cargo-build "$dir" cargo build --locked
+      run clippy "$dir" cargo clippy --all-targets --locked
+      run cargo-test "$dir" cargo test --locked ;;
+    *) run "npm-ci-${dir//\//-}" "$dir" npm ci ;;
+  esac
+  ran="$ran $dir"
+done
+echo "#$pr PASS${ran:- scope only (CI checks workflows)} log=$log"