diff --git a/.agents/skills/verify-agent-tty/SKILL.md b/.agents/skills/verify-agent-tty/SKILL.md
index 385afcef..d315bf8c 100644
--- a/.agents/skills/verify-agent-tty/SKILL.md
+++ b/.agents/skills/verify-agent-tty/SKILL.md
@@ -75,15 +75,16 @@ It then copies each session's `session.json`, `events.jsonl` and `artifacts/` in
 
 ## Helpers
 
-All scripts take the run's `env.sh` path, except `start-run.sh` and `stale-dist.sh`:
-
-| Script                         | Use                                                                               |
-| ------------------------------ | --------------------------------------------------------------------------------- |
-| `scripts/start-run.sh [name]`  | Sync deps with the lockfile, build, make the run folder, print the `env.sh` path. |
-| `scripts/stale-dist.sh`        | Print why `dist/` is not a complete, current build of `src/`, or nothing.         |
-| `scripts/doctor.sh <env.sh>`   | Check that the run is worth driving. Exit 0 or 1.                                 |
-| `scripts/run-pids.sh <env.sh>` | Print the PIDs this run started. Exit 2: no `/proc`. Exit 3: ledger error.        |
-| `scripts/cleanup.sh <env.sh>`  | Tear the run down and keep the evidence.                                          |
+All scripts take the run's `env.sh` path, except `start-run.sh`, `stale-dist.sh` and `dependabot-resolve.sh`:
+
+| Script                                            | Use                                                                                                                                                                                                             |
+| ------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `scripts/start-run.sh [name]`                     | Sync deps with the lockfile, build, make the run folder, print the `env.sh` path.                                                                                                                               |
+| `scripts/stale-dist.sh`                           | Print why `dist/` is not a complete, current build of `src/`, or nothing.                                                                                                                                       |
+| `scripts/doctor.sh <env.sh>`                      | Check that the run is worth driving. Exit 0 or 1.                                                                                                                                                               |
+| `scripts/run-pids.sh <env.sh>`                    | Print the PIDs this run started. Exit 2: no `/proc`. Exit 3: ledger error.                                                                                                                                      |
+| `scripts/cleanup.sh <env.sh>`                     | Tear the run down and keep the evidence.                                                                                                                                                                        |
+| `scripts/dependabot-resolve.sh [dep@version ...]` | Replay Dependabot's npm resolve on an empty pnpm store. Run it after a change to `package.json`, `pnpm-lock.yaml`, `pnpm-workspace.yaml` or `.github/dependabot.yml`. Exit 1: a dep fails. Exit 2: setup error. |
 
 ## Keep the map honest
 
diff --git a/.agents/skills/verify-agent-tty/scripts/dependabot-resolve.sh b/.agents/skills/verify-agent-tty/scripts/dependabot-resolve.sh
new file mode 100755
index 00000000..331c4da9
--- /dev/null
+++ b/.agents/skills/verify-agent-tty/scripts/dependabot-resolve.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Replays the resolve that a Dependabot npm version update runs on this
+# checkout: `pnpm update <dep> --lockfile-only` with Dependabot's 7-day
+# cooldown as the minimum release age, on copies of package.json,
+# pnpm-lock.yaml and pnpm-workspace.yaml, against an empty pnpm store. A
+# store that already holds the locked packages skips pnpm's trust check, so
+# only an empty store shows what Dependabot sees. Needs the npm registry and
+# the pnpm version that package.json's packageManager field pins.
+#
+#   .agents/skills/verify-agent-tty/scripts/dependabot-resolve.sh [dep@version ...]
+#
+# Prints one line per dep and a count line. Exit 0 when every dep resolves,
+# 1 when one fails, 2 on a setup error.
+set -uo pipefail
+
+repo=$(git -C "$(dirname "${BASH_SOURCE[0]}")" rev-parse --show-toplevel) || exit 2
+pnpm=$(cd "$repo" && { mise which pnpm 2>/dev/null || command -v pnpm; }) || {
+  echo "dependabot-resolve.sh: pnpm is not on PATH; run 'mise install' first" >&2
+  exit 2
+}
+want=$(sed -n 's/^ *"packageManager": "pnpm@\([^"]*\)".*/\1/p' "$repo/package.json")
+have=$(cd "$repo" && "$pnpm" --version 2>/dev/null)
+if [ -z "$want" ] || [ "$have" != "$want" ]; then
+  echo "dependabot-resolve.sh: $pnpm is pnpm ${have:-unknown}, package.json pins ${want:-nothing}" >&2
+  exit 2
+fi
+[ "$#" -gt 0 ] || set -- commander@latest zod@latest vitest@latest
+work=$(mktemp -d "${TMPDIR:-/tmp}/dependabot-resolve-XXXXXX") || exit 2
+trap 'rm -rf "$work"' EXIT
+
+failed=0
+for dep in "$@"; do
+  rm -rf "$work/repo" "$work/store" "$work/cache"
+  mkdir "$work/repo"
+  cp "$repo/package.json" "$repo/pnpm-lock.yaml" "$repo/pnpm-workspace.yaml" "$work/repo/" || exit 2
+  if (cd "$work/repo" && "$pnpm" update "$dep" --lockfile-only \
+    --config.minimum-release-age=10080 \
+    --store-dir="$work/store" --cache-dir="$work/cache") >"$work/log" 2>&1; then
+    echo "ok   $dep"
+  else
+    failed=$((failed + 1))
+    reason=$(grep -m1 -oE 'ERR_PNPM_[A-Z_]+.{0,160}' "$work/log" || tail -n 1 "$work/log")
+    echo "FAIL $dep: $reason"
+  fi
+done
+echo "dependabot-resolve: $(($# - failed)) of $# resolved"
+[ "$failed" -eq 0 ]
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b1bf00a2..6e1e6632 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -3,7 +3,14 @@ updates:
   # pnpm project (Dependabot detects pnpm from pnpm-lock.yaml and the
   # packageManager field). The 7-day cooldown (zizmor's minimum) also exceeds
   # pnpm-workspace.yaml's 1-day minimumReleaseAge, so version updates never
-  # propose a release pnpm would refuse to resolve.
+  # propose a release pnpm would refuse to resolve. Dependabot passes the
+  # cooldown to pnpm as its minimum release age, which pnpm checks against
+  # every locked package: a locked release younger than 7 days needs an
+  # exact-version minimumReleaseAgeExclude entry in pnpm-workspace.yaml.
+  # Dependabot also resolves on an empty store, where pnpm's trust check sees
+  # every locked package.
+  # .agents/skills/verify-agent-tty/scripts/dependabot-resolve.sh replays that
+  # resolve.
   - package-ecosystem: npm
     directory: /
     schedule:
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index f4b5e94e..d6c4d8a2 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -6,6 +6,13 @@
 # resolver falls back to an older match), and reject versions whose publish
 # trust evidence weakens between releases.
 minimumReleaseAge: 1440
+# Dependabot runs pnpm with its 7-day cooldown as the minimum release age, and
+# pnpm applies that age to every locked package: while one locked release is
+# younger than 7 days, every npm version update fails. Exclude only such
+# exact versions, so newer releases of the same package stay behind both
+# age checks.
+minimumReleaseAgeExclude:
+  - '@coder/libghostty-vt-node@0.1.0-beta.7'
 trustPolicy: no-downgrade
 
 # Resolve optional platform dependencies for every platform devs and CI use,
@@ -27,3 +34,10 @@ trustPolicyExclude:
   # CJS-only); octokit only publishes provenance attestations for the newer
   # pure-ESM majors, so this exact version has no trust evidence to verify.
   - '@octokit/endpoint@9.0.6'
+  # semver 5.7.2 (2023) is a backport release without provenance, published
+  # after 7.5.1 had it. release-please reaches it through
+  # conventional-changelog-writer > meow > read-pkg-up > read-pkg >
+  # normalize-package-data.
+  # A fresh resolve (Dependabot's `pnpm update` on an empty store) refuses it
+  # as a trust downgrade, and then every npm update fails.
+  - 'semver@5.7.2'