diff --git a/.claude/skills/pr-review/SKILL.md b/.claude/skills/pr-review/SKILL.md
index 625f219a..ba53df5d 100644
--- a/.claude/skills/pr-review/SKILL.md
+++ b/.claude/skills/pr-review/SKILL.md
@@ -18,11 +18,8 @@ everything both did and adds the backward-compat guard and a single shared rubri
 
 <!--
 Twin of orbit-ui-mobile/.claude/skills/pr-review/SKILL.md: two repos, so the copies cannot be
-deduped. They are mirrored BY HAND. `Harness Lockstep` was dropped from this repository's
-required contexts on 2026-08-04, and the harness rebuild on orbit-ui-mobile
-`chore/harness-rebuild` deletes the tool behind it, so a red lockstep run blocks nothing and
-soon will not run at all. Change a phase here and mirror it there in the same task, because
-only that discipline keeps the pair honest. Known intentional
+deduped. They are mirrored BY HAND. Change a phase here and mirror it there in the same task,
+because only that discipline keeps the pair honest. Known intentional
 differences: the default repo (api here, ui there) and the mirror-image `ui#` / `api#`
 selector; the subagent set (security-reviewer + contract-aligner here, parity/i18n/design
 ui-only); and `dotnet` validate in Phase 7 vs the ui `/validate` skill.
diff --git a/.claude/skills/pr-review/rubric.md b/.claude/skills/pr-review/rubric.md
index 9159a989..c8935985 100644
--- a/.claude/skills/pr-review/rubric.md
+++ b/.claude/skills/pr-review/rubric.md
@@ -9,10 +9,7 @@ rubric over the whole repo.
 
 **A TWIN does exist**, at `orbit-ui-mobile/.claude/skills/pr-review/rubric.md`,
 where `/audit-code-quality` also walks it. Two repos mean the file cannot be deduped, so the
-two are mirrored **by hand**. `Harness Lockstep` was dropped from this repository's required
-contexts on 2026-08-04, and the harness rebuild on orbit-ui-mobile `chore/harness-rebuild`
-deletes the tool behind it, so a red lockstep run blocks nothing and soon will not run at
-all. Only a careful author keeps the pair honest now.
+two are mirrored **by hand**. Only a careful author keeps the pair honest now.
 Intentional divergences run in both directions: backend-only
 material here, such as dimension 13's transaction-teardown bullet (`ORBIT0002`), and
 orbit-ui-mobile-only material there, such as dimension 15's harness-execution evidence,
diff --git a/.github/workflows/guards.yml b/.github/workflows/guards.yml
index 91cc039e..db9b0ee0 100644
--- a/.github/workflows/guards.yml
+++ b/.github/workflows/guards.yml
@@ -10,9 +10,6 @@ name: Guards
 # Skill and Agent Frontmatter (REBUILD.md section 14, item 1): an unquoted YAML
 # value containing ": " drops the skill or agent silently, which is how this
 # repo's security-reviewer stopped loading.
-#
-# Harness Lockstep (ORB-105): the six load-bearing review and security harness
-# twins must stay aligned with orbit-ui-mobile.
 
 on:
   pull_request:
@@ -65,95 +62,3 @@ jobs:
         with:
           node-version: 22
       - run: node tools/check-frontmatter.mjs
-
-  lockstep:
-    name: Harness Lockstep
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          fetch-depth: 0
-          persist-credentials: false
-      - name: Detect a lockstep change
-        id: scope
-        run: |
-          if [ "${{ github.event_name }}" != "pull_request" ]; then
-            echo "changed=true" >> "$GITHUB_OUTPUT"
-          elif git diff --name-only --diff-filter=ACMRD origin/${{ github.base_ref }}...HEAD \
-            | grep -Eq '^(\.claude/skills/pr-review/(SKILL\.md|rubric\.md)|\.claude/skills/_shared/verification-protocol\.md|\.claude/agents/(contract-aligner|security-reviewer)\.md|\.claude/skills/second-opinion/second-opinion\.mjs|\.github/workflows/guards\.yml)$'; then
-            echo "changed=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "changed=false" >> "$GITHUB_OUTPUT"
-          fi
-      - name: Resolve coordinated sibling candidate
-        id: sibling
-        if: steps.scope.outputs.changed == 'true'
-        env:
-          GH_TOKEN: ${{ github.token }}
-          EVENT_NAME: ${{ github.event_name }}
-          PR_BODY: ${{ github.event.pull_request.body }}
-          CURRENT_PR: ${{ github.event.pull_request.number }}
-          PEER_REPOSITORY: thomasluizon/orbit-ui-mobile
-        run: |
-          set -euo pipefail
-          ref=main
-          if [ "$EVENT_NAME" = "pull_request" ]; then
-            directives=$(printf '%s\n' "$PR_BODY" | tr -d '\r' | grep -E '^Harness-Lockstep-Peer:' || true)
-            count=$(printf '%s\n' "$directives" | sed '/^$/d' | wc -l | tr -d ' ')
-            if [ "$count" -gt 1 ]; then
-              echo "::error::PR body has more than one Harness-Lockstep-Peer directive"
-              exit 1
-            fi
-            if [ "$count" -eq 1 ]; then
-              peer_pr=$(printf '%s\n' "$directives" | sed -nE 's/^Harness-Lockstep-Peer:[[:space:]]*([1-9][0-9]*)[[:space:]]*$/\1/p')
-              if [ -z "$peer_pr" ]; then
-                echo "::error::Harness-Lockstep-Peer must contain one positive PR number"
-                exit 1
-              fi
-              peer_json=$(gh api "repos/$PEER_REPOSITORY/pulls/$peer_pr")
-              peer_base=$(jq -r '.base.ref' <<< "$peer_json")
-              peer_base_repo=$(jq -r '.base.repo.full_name' <<< "$peer_json")
-              peer_head_repo=$(jq -r '.head.repo.full_name' <<< "$peer_json")
-              peer_state=$(jq -r '.state' <<< "$peer_json")
-              peer_merged=$(jq -r '.merged' <<< "$peer_json")
-              peer_sha=$(jq -r '.head.sha' <<< "$peer_json")
-              if [ "$peer_base" != "main" ] || [ "$peer_base_repo" != "$PEER_REPOSITORY" ] || [ "$peer_head_repo" != "$PEER_REPOSITORY" ]; then
-                echo "::error::paired PR must target main from a branch in $PEER_REPOSITORY; forks are not accepted"
-                exit 1
-              fi
-              reciprocal=$(jq -r '.body // ""' <<< "$peer_json" | tr -d '\r' | grep -Fxc "Harness-Lockstep-Peer: $CURRENT_PR" || true)
-              if [ "$reciprocal" -ne 1 ]; then
-                echo "::error::$PEER_REPOSITORY#$peer_pr must contain exactly: Harness-Lockstep-Peer: $CURRENT_PR"
-                exit 1
-              fi
-              if [ "$peer_state" = "open" ]; then
-                if ! [[ "$peer_sha" =~ ^[0-9a-f]{40}$ ]]; then
-                  echo "::error::paired PR returned an invalid head SHA"
-                  exit 1
-                fi
-                ref=$peer_sha
-              elif [ "$peer_merged" = "true" ]; then
-                ref=main
-              else
-                echo "::error::$PEER_REPOSITORY#$peer_pr is closed without merge"
-                exit 1
-              fi
-            fi
-          fi
-          echo "ref=$ref" >> "$GITHUB_OUTPUT"
-          echo "Sibling candidate: $PEER_REPOSITORY@$ref"
-      - name: Check out orbit-ui-mobile candidate
-        if: steps.scope.outputs.changed == 'true'
-        uses: actions/checkout@v7
-        with:
-          repository: thomasluizon/orbit-ui-mobile
-          ref: ${{ steps.sibling.outputs.ref }}
-          path: orbit-ui-mobile
-          persist-credentials: false
-      - uses: actions/setup-node@v7
-        if: steps.scope.outputs.changed == 'true'
-        with:
-          node-version: 22
-      - name: Six harness twins stay in lockstep
-        if: steps.scope.outputs.changed == 'true'
-        run: node orbit-ui-mobile/tools/check-lockstep.mjs --ui-root "$GITHUB_WORKSPACE/orbit-ui-mobile" --api-root "$GITHUB_WORKSPACE"