Add superinstructions LOOK+1, LOOK-1 for 25% faster loops

Fused opcodes: LOOK_ADD1 (lookup + increment) and LOOK_SUB1
(lookup + decrement) emitted directly by compiler for (+ sym 1)
and (- sym 1) patterns. Eliminates one dispatch per loop iteration.

sum-to(50000) ratio improved from 59x to 45x vs Python.
ackermann(3,4) steady at 83x. 571 tests green.

Also defines LOOK_LOOK, CONST_EQ_JF, LOOK_CONST_CALL2
superinstruction opcodes (VM handlers ready, compiler emission
for remaining patterns deferred to next pass).

proof/.github/workflows/create-release.yml

@@ -0,0 +1,22 @@
+name: Create Release
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'master'
+    paths:
+      - 'lean-toolchain'
+
+jobs:
+  lean-release-tag:
+    name: Add Lean release tag
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+    - name: lean-release-tag action
+      uses: leanprover-community/lean-release-tag@v1
+      with:
+        do-release: true
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

proof/.github/workflows/lean_action_ci.yml

@@ -0,0 +1,21 @@
+name: Lean Action CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read # Read access to repository contents
+  pages: write # Write access to GitHub Pages
+  id-token: write # Write access to ID tokens
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+      - uses: leanprover/lean-action@v1
+      - uses: leanprover-community/docgen-action@v1

proof/.github/workflows/update.yml

@@ -0,0 +1,41 @@
+name: Update Dependencies
+
+on:
+  # schedule:             # Sets a schedule to trigger the workflow
+  #   - cron: "0 8 * * *" # Every day at 08:00 AM UTC (see https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#schedule)
+  workflow_dispatch:    # Allows the workflow to be triggered manually via the GitHub interface
+
+jobs:
+  check-for-updates: # Determines which updates to apply.
+    runs-on: ubuntu-latest
+    outputs:
+      is-update-available: ${{ steps.check-for-updates.outputs.is-update-available }}
+      new-tags: ${{ steps.check-for-updates.outputs.new-tags }}
+    steps:
+      - name: Run the action
+        id: check-for-updates
+        uses: leanprover-community/mathlib-update-action@v1
+        # START CONFIGURATION BLOCK 1
+        # END CONFIGURATION BLOCK 1
+  do-update: # Runs the upgrade, tests it, and makes a PR/issue/commit.
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write      # Grants permission to push changes to the repository
+      issues: write        # Grants permission to create or update issues
+      pull-requests: write # Grants permission to create or update pull requests
+    needs: check-for-updates
+    if: ${{ needs.check-for-updates.outputs.is-update-available == 'true' }}
+    strategy: # Runs for each update discovered by the `check-for-updates` job.
+      max-parallel: 1 # Ensures that the PRs/issues are created in order.
+      matrix:
+        tag: ${{ fromJSON(needs.check-for-updates.outputs.new-tags) }}
+    steps:
+      - name: Run the action
+        id: update-the-repo
+        uses: leanprover-community/mathlib-update-action/do-update@v1
+        with:
+          tag: ${{ matrix.tag }}
+          # START CONFIGURATION BLOCK 2
+          on_update_succeeds: pr # Create a pull request if the update succeeds
+          on_update_fails: issue # Create an issue if the update fails
+          # END CONFIGURATION BLOCK 2