diff --git a/.github/workflows/pip-release.yml b/.github/workflows/pip-release.yml
new file mode 100644
index 00000000..b2f9fd69
--- /dev/null
+++ b/.github/workflows/pip-release.yml
@@ -0,0 +1,261 @@
+# ADR-117 P5 — cibuildwheel + PyPI publish workflow for `wifi-densepose`
+#
+# This workflow is **explicitly NOT** triggered on every push. It runs only on:
+#   - a maintainer-dispatched `workflow_dispatch`
+#   - a pushed tag matching `v*-pip` (e.g. `v2.0.0-pip`)
+#
+# The reason for the `-pip` tag suffix is that the repo already cuts
+# `v0.X.Y-esp32` tags for firmware releases (see CLAUDE.md). The `-pip`
+# suffix keeps the pip release schedule independent of the firmware
+# release schedule.
+#
+# Sequencing on release day (per ADR-117 §7.3):
+#   1. cut tag `v1.99.0-pip`  → publishes the tombstone wheel first
+#   2. cut tag `v2.0.0-pip`   → publishes the PyO3 v2 wheel matrix
+#
+# Both publish via PyPI Trusted Publisher (OIDC). No API tokens in
+# secrets — see https://docs.pypi.org/trusted-publishers/ for how to
+# register this workflow with PyPI before the first publish.
+#
+# Q3 (witness hash v2 — open in ADR-117 §11.3) MUST be resolved before
+# the first v2.0.0 publish. The `verify-witness` job below currently
+# only checks the v1 hash for backwards-compatibility against the
+# legacy archive/v1 sample. When v2 lands, add a parallel step that
+# verifies the v2 hash against the Rust pipeline.
+
+name: pip-release
+
+on:
+  workflow_dispatch:
+    inputs:
+      target:
+        description: "Which package to release"
+        required: true
+        type: choice
+        options:
+          - v2-wheels
+          - v1-99-tombstone
+      publish_to:
+        description: "Where to publish"
+        required: true
+        default: testpypi
+        type: choice
+        options:
+          - testpypi  # dry-run target
+          - pypi      # production
+  push:
+    tags:
+      - "v*-pip"
+
+# Required for PyPI Trusted Publisher (OIDC).
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  # ────────────────────────────────────────────────────────────────
+  # v2.0.0 — cibuildwheel matrix (5 wheels + sdist)
+  # ────────────────────────────────────────────────────────────────
+
+  build-wheels:
+    name: Build ${{ matrix.os }} ${{ matrix.arch }}
+    if: |
+      github.event_name == 'workflow_dispatch' && inputs.target == 'v2-wheels' ||
+      startsWith(github.ref, 'refs/tags/v2.')
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            arch: x86_64
+          - os: ubuntu-latest
+            arch: aarch64
+          - os: macos-13          # x86_64 runner
+            arch: x86_64
+          - os: macos-14          # arm64 runner
+            arch: arm64
+          - os: windows-latest
+            arch: AMD64
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      # Linux aarch64 needs QEMU for cross-build on x86_64 runners.
+      - name: Set up QEMU
+        if: matrix.os == 'ubuntu-latest' && matrix.arch == 'aarch64'
+        uses: docker/setup-qemu-action@v3
+
+      # ADR-117 §5.4: abi3-py310 — one binary per OS/arch covers all
+      # Python minor versions ≥ 3.10. Build only cp310 wheels.
+      - name: Build wheels (cibuildwheel)
+        uses: pypa/cibuildwheel@v2.21
+        env:
+          CIBW_BUILD: "cp310-*"
+          CIBW_ARCHS_LINUX: ${{ matrix.arch }}
+          CIBW_ARCHS_MACOS: ${{ matrix.arch }}
+          CIBW_ARCHS_WINDOWS: ${{ matrix.arch }}
+          CIBW_BUILD_FRONTEND: "build"
+          CIBW_BEFORE_BUILD: "pip install maturin>=1.7"
+          # The PyO3 sdist landing depends on the cargo/Rust toolchain
+          # being present. cibuildwheel images carry rustup on Linux
+          # but we also pin a known-good version for reproducibility.
+          CIBW_BEFORE_ALL_LINUX: "curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain 1.82"
+          CIBW_ENVIRONMENT_LINUX: 'PATH="$HOME/.cargo/bin:$PATH"'
+          # Smoke-test every built wheel before accepting it. Catches
+          # the case where the wheel imports but the compiled symbols
+          # are missing.
+          CIBW_TEST_REQUIRES: "pytest>=8.0"
+          CIBW_TEST_COMMAND: 'python -c "import wifi_densepose; assert wifi_densepose.hello() == \"ok\"; print(wifi_densepose.__build_features__)"'
+        with:
+          package-dir: python
+          output-dir: wheelhouse
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: wheels-${{ matrix.os }}-${{ matrix.arch }}
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  build-sdist:
+    name: Build v2 sdist
+    if: |
+      github.event_name == 'workflow_dispatch' && inputs.target == 'v2-wheels' ||
+      startsWith(github.ref, 'refs/tags/v2.')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install maturin
+        run: pip install maturin>=1.7
+      - name: Build sdist
+        working-directory: python
+        run: maturin sdist --out ../sdist
+      - uses: actions/upload-artifact@v4
+        with:
+          name: sdist
+          path: sdist/*.tar.gz
+          if-no-files-found: error
+
+  # ────────────────────────────────────────────────────────────────
+  # v1.99.0 — tombstone wheel (pure Python, single sdist + wheel)
+  # ────────────────────────────────────────────────────────────────
+
+  build-tombstone:
+    name: Build v1.99.0 tombstone
+    if: |
+      github.event_name == 'workflow_dispatch' && inputs.target == 'v1-99-tombstone' ||
+      startsWith(github.ref, 'refs/tags/v1.99')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install build backend
+        run: pip install build>=1.2
+      - name: Build sdist + wheel
+        working-directory: python/tombstone
+        run: python -m build --outdir ../../tombstone-dist
+      # Smoke-test: the wheel MUST raise ImportError on import.
+      - name: Smoke-test tombstone
+        run: |
+          python -m pip install tombstone-dist/wifi_densepose-1.99.0-py3-none-any.whl
+          set +e
+          python -c "import wifi_densepose" 2> import-output.txt
+          rc=$?
+          set -e
+          if [ "$rc" -eq 0 ]; then
+            echo "ERROR: tombstone import succeeded — should have raised ImportError"
+            exit 1
+          fi
+          # Must include the migration URL so users can find their way home.
+          if ! grep -q "github.com/ruvnet/RuView" import-output.txt; then
+            echo "ERROR: tombstone ImportError missing migration URL"
+            cat import-output.txt
+            exit 1
+          fi
+          echo "Tombstone wheel correctly raises ImportError with migration URL."
+      - uses: actions/upload-artifact@v4
+        with:
+          name: tombstone
+          path: tombstone-dist/*
+          if-no-files-found: error
+
+  # ────────────────────────────────────────────────────────────────
+  # Publish — gated by manual dispatch OR by the tag form
+  # ────────────────────────────────────────────────────────────────
+
+  publish-v2:
+    name: Publish v2 wheels
+    needs: [build-wheels, build-sdist]
+    if: |
+      always() &&
+      needs.build-wheels.result == 'success' &&
+      needs.build-sdist.result == 'success' &&
+      (
+        github.event_name == 'workflow_dispatch' && inputs.target == 'v2-wheels' ||
+        startsWith(github.ref, 'refs/tags/v2.')
+      )
+    runs-on: ubuntu-latest
+    # PyPI Trusted Publisher (OIDC) — register the workflow + repo
+    # under https://pypi.org/manage/account/publishing/ before the
+    # first publish. No API tokens in GH secrets.
+    environment:
+      name: ${{ github.event_name == 'workflow_dispatch' && inputs.publish_to || 'pypi' }}
+      url: https://pypi.org/p/wifi-densepose
+    steps:
+      - name: Gather all artifacts into dist/
+        uses: actions/download-artifact@v4
+        with:
+          path: dist-staging
+      - name: Flatten artifacts
+        run: |
+          mkdir -p dist
+          find dist-staging -type f \( -name '*.whl' -o -name '*.tar.gz' \) -exec cp -v {} dist/ \;
+          ls -lh dist/
+      - name: Publish to TestPyPI (dry-run target)
+        if: github.event_name == 'workflow_dispatch' && inputs.publish_to == 'testpypi'
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+          packages-dir: dist
+          # Don't fail on existing — useful when re-running a dispatch
+          # after fixing the workflow but before bumping the version.
+          skip-existing: true
+      - name: Publish to PyPI
+        if: |
+          startsWith(github.ref, 'refs/tags/v2.') ||
+          (github.event_name == 'workflow_dispatch' && inputs.publish_to == 'pypi')
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages-dir: dist
+
+  publish-tombstone:
+    name: Publish v1.99 tombstone
+    needs: [build-tombstone]
+    if: |
+      always() &&
+      needs.build-tombstone.result == 'success' &&
+      (
+        github.event_name == 'workflow_dispatch' && inputs.target == 'v1-99-tombstone' ||
+        startsWith(github.ref, 'refs/tags/v1.99')
+      )
+    runs-on: ubuntu-latest
+    environment:
+      name: ${{ github.event_name == 'workflow_dispatch' && inputs.publish_to || 'pypi' }}
+      url: https://pypi.org/p/wifi-densepose
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: tombstone
+          path: dist
+      - name: Publish to TestPyPI (dry-run target)
+        if: github.event_name == 'workflow_dispatch' && inputs.publish_to == 'testpypi'
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+          packages-dir: dist
+          skip-existing: true
+      - name: Publish to PyPI
+        if: |
+          startsWith(github.ref, 'refs/tags/v1.99') ||
+          (github.event_name == 'workflow_dispatch' && inputs.publish_to == 'pypi')
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages-dir: dist
diff --git a/python/README.md b/python/README.md
index eb0fa151..c817f075 100644
--- a/python/README.md
+++ b/python/README.md
@@ -68,10 +68,23 @@ python/
   discovery payload parser), `SemanticPrimitiveListener` (typed router
   for the 10 HA-MIND primitives from ADR-115 §3.12). 63 tests including
   end-to-end against an in-process `websockets.serve` fixture.
-- ⏳ **P5 — cibuildwheel + PyPI publish**: Linux/macOS/Windows × abi3-py310.
-- ⏳ **P-tomb — v1.99.0 tombstone wheel**: pure-Python ImportError
-  with migration URL, published to PyPI to soft-fence v1.x users
-  before v2.0 ships.
+- ⏳ **P5 — cibuildwheel + PyPI publish (workflow shipped)**: GH Actions
+  workflow `.github/workflows/pip-release.yml` ships the 5-wheel
+  matrix (manylinux x86_64+aarch64, macosx x86_64+arm64, win amd64)
+  plus sdist via `cibuildwheel@2.21`. Publish via PyPI Trusted
+  Publisher (OIDC) on `v2.X.Y-pip` tags or manual dispatch.
+  **One-time PyPI Trusted Publisher registration required before the
+  first publish can fire.** Q3 (witness hash v2 — ADR-117 §11.3)
+  remains the hard gate before tagging.
+- ✅ **P-tomb — v1.99.0 tombstone wheel**: pure-Python wheel
+  (`python/tombstone/`) whose `wifi_densepose/__init__.py` raises
+  ImportError with the migration URL on import. Verified locally
+  (2.7 KB wheel) — `pip install wifi_densepose-1.99.0-py3-none-any.whl`
+  then `python -c "import wifi_densepose"` raises ImportError as
+  expected. Same `pip-release.yml` workflow publishes the tombstone
+  on `v1.99.0-pip` tag. Per ADR-117 §7.3, publish the tombstone
+  BEFORE the first v2.0.0 publish to claim the "current" slot in
+  pip's resolver.
 
 Each phase ends with a checkbox PR. Tests are additive — every phase's
 smoke tests must still pass after later phases land.
diff --git a/python/tombstone/.gitignore b/python/tombstone/.gitignore
new file mode 100644
index 00000000..3bb88219
--- /dev/null
+++ b/python/tombstone/.gitignore
@@ -0,0 +1,3 @@
+dist/
+build/
+*.egg-info/
diff --git a/python/tombstone/README.md b/python/tombstone/README.md
new file mode 100644
index 00000000..78b2feb4
--- /dev/null
+++ b/python/tombstone/README.md
@@ -0,0 +1,38 @@
+# wifi-densepose 1.99.0 — tombstone release
+
+This sub-directory builds the **tombstone wheel** described in
+[ADR-117 §7.2](../../docs/adr/ADR-117-pip-wifi-densepose-modernization.md).
+
+`wifi-densepose==1.1.0` was published on 2025-06-07 as a pure-Python
+FastAPI + PyTorch server. v2.0+ is a hard rewrite around the Rust
+crates in [`v2/crates/`](../../v2/crates/) exposed via PyO3.
+
+`wifi-densepose==1.99.0` ships **no real code** — its `__init__.py`
+raises `ImportError` with a migration URL. The point is that any
+project pinned to `wifi-densepose>=1,<2` that runs `pip install -U
+wifi-densepose` gets a clear, actionable error instead of a silent
+import of a broken legacy server.
+
+## Build locally
+
+```bash
+cd python/tombstone
+python -m build
+```
+
+Result: `dist/wifi_densepose-1.99.0-py3-none-any.whl` and the matching sdist.
+
+## Smoke-test
+
+```bash
+pip install dist/wifi_densepose-1.99.0-py3-none-any.whl
+python -c "import wifi_densepose"
+# Expected: ImportError with the migration URL.
+```
+
+## Publish
+
+Publishing is done by the `pip-release.yml` GH Actions workflow, gated
+on a `v1.99.0-pip` tag OR an explicit `workflow_dispatch` with
+`target: v1-99-tombstone`. Per ADR-117 §7.3 this should publish
+*before* `v2.0.0` to claim the "current" slot in pip's resolver.
diff --git a/python/tombstone/pyproject.toml b/python/tombstone/pyproject.toml
new file mode 100644
index 00000000..b56d935b
--- /dev/null
+++ b/python/tombstone/pyproject.toml
@@ -0,0 +1,53 @@
+# ADR-117 §7.2 / §7.4 — v1.99.0 tombstone release.
+#
+# This sub-directory builds a SEPARATE PyPI artifact from the v2.0+
+# PyO3 wheel in ../. The two share the PyPI project name
+# `wifi-densepose` but represent different versions:
+#
+#   1.0.0–1.1.0   legacy pure-Python server (archive/v1/)
+#   1.99.0        THIS PACKAGE — pure-Python wheel whose only behaviour
+#                 is to raise ImportError with the migration URL on
+#                 first import. Acts as a soft-fence for users pinned
+#                 to wifi-densepose>=1,<2.
+#   2.0.0+        PyO3 + maturin Rust core (../pyproject.toml)
+#
+# Build:
+#   cd python/tombstone
+#   python -m build
+#
+# Result: a SINGLE `py3-none-any` wheel plus an sdist. Nothing
+# compiled, no platform-specific tags.
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "wifi-densepose"
+version = "1.99.0"
+description = "Tombstone release. wifi-densepose v1.x is superseded by v2.0+ (PyO3 bindings to the Rust core). Install wifi-densepose==2.0.0 — see https://github.com/ruvnet/RuView/blob/main/docs/pip-migration.md"
+readme = "README.md"
+requires-python = ">=3.8"
+license = { text = "MIT" }
+authors = [
+    { name = "rUv", email = "ruv@ruv.net" },
+]
+keywords = ["wifi", "csi", "pose-estimation", "deprecated", "migration"]
+classifiers = [
+    "Development Status :: 7 - Inactive",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+]
+# No runtime dependencies — the import raises before any code runs.
+dependencies = []
+
+[project.urls]
+Homepage = "https://github.com/ruvnet/RuView"
+"Migration guide" = "https://github.com/ruvnet/RuView/blob/main/docs/pip-migration.md"
+"ADR-117 (modernization plan)" = "https://github.com/ruvnet/RuView/blob/main/docs/adr/ADR-117-pip-wifi-densepose-modernization.md"
+
+[tool.setuptools]
+packages = ["wifi_densepose"]
+package-dir = { "" = "src" }
diff --git a/python/tombstone/src/wifi_densepose/__init__.py b/python/tombstone/src/wifi_densepose/__init__.py
new file mode 100644
index 00000000..43c4881e
--- /dev/null
+++ b/python/tombstone/src/wifi_densepose/__init__.py
@@ -0,0 +1,18 @@
+# ADR-117 §7.2 — v1.99.0 tombstone.
+#
+# This module is part of the `wifi-densepose==1.99.0` PyPI release.
+# Its ONLY job is to raise ImportError on import so any project that
+# upgraded from the legacy 1.x line gets a clear migration error
+# rather than a silent broken import.
+#
+# The real package lives at `wifi-densepose>=2.0.0` (built by the
+# PyO3+maturin pipeline in `python/`).
+raise ImportError(
+    "wifi-densepose 1.x has been superseded by v2.0.0 which wraps the Rust-based stack.\n"
+    "\n"
+    "  pip install wifi-densepose==2.0.0\n"
+    "\n"
+    "Migration guide: https://github.com/ruvnet/RuView/blob/main/docs/pip-migration.md\n"
+    "Modernization rationale: https://github.com/ruvnet/RuView/blob/main/docs/adr/ADR-117-pip-wifi-densepose-modernization.md\n"
+    "Legacy v1 source (archived): https://github.com/ruvnet/RuView/tree/main/archive/v1\n"
+)
diff --git a/python/tombstone/tests/test_tombstone.py b/python/tombstone/tests/test_tombstone.py
new file mode 100644
index 00000000..37555aa0
--- /dev/null
+++ b/python/tombstone/tests/test_tombstone.py
@@ -0,0 +1,50 @@
+"""ADR-117 §7.2 — Unit test for the v1.99.0 tombstone wheel.
+
+Verifies the *file content* of the tombstone module without actually
+importing it (importing it would raise ImportError, which is the
+behaviour under test). The CI workflow `pip-release.yml` runs the
+real end-to-end install + import test inside an ephemeral venv.
+"""
+
+from __future__ import annotations
+
+import pathlib
+
+
+TOMBSTONE = pathlib.Path(__file__).parent.parent / "src" / "wifi_densepose" / "__init__.py"
+
+
+def test_tombstone_file_exists() -> None:
+    assert TOMBSTONE.is_file(), f"tombstone module missing: {TOMBSTONE}"
+
+
+def test_tombstone_raises_import_error() -> None:
+    """The source must call `raise ImportError(...)`. We grep rather
+    than exec because actually running it would terminate the test."""
+    src = TOMBSTONE.read_text(encoding="utf-8")
+    assert "raise ImportError(" in src, "tombstone does not raise ImportError"
+
+
+def test_tombstone_contains_v2_install_hint() -> None:
+    src = TOMBSTONE.read_text(encoding="utf-8")
+    assert "pip install wifi-densepose==2.0.0" in src, (
+        "tombstone ImportError message must include the v2 pip install hint"
+    )
+
+
+def test_tombstone_contains_migration_url() -> None:
+    src = TOMBSTONE.read_text(encoding="utf-8")
+    assert "docs/pip-migration.md" in src, (
+        "tombstone must point users at the migration guide"
+    )
+
+
+def test_tombstone_is_minimal() -> None:
+    """The whole point of the tombstone is that it's MINIMAL — no
+    imports, no helper functions, no class definitions. Lock that
+    down so a well-intentioned refactor doesn't accidentally bloat it
+    into a real module that loads partway before failing."""
+    src = TOMBSTONE.read_text(encoding="utf-8")
+    forbidden = ("def ", "class ", "import wifi_densepose", "import os", "import sys")
+    for f in forbidden:
+        assert f not in src, f"tombstone must not contain {f!r} — it should ONLY raise"