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+# .gitea/workflows/ci.yml - ResearchX phase-4 CI gate (researchx#24).
+#
+# Ported to the v0.3 line (milestone/v0.3-hosted): phase 4 ships on the
+# milestone branch, and the pull_request trigger is extended to it so a
+# phase-4 pull request gets a gate run there. The file itself is the same
+# gate that ran green on main (researchx#24).
+#
+# This file IS the gate. The pre-code clause (coreci/company#105, c14057):
+# a code phase opens only when the product repo's gating workflow file has
+# dispatched at least one run on `main` and every job in that file is green
+# in that run. Until this file exists, coreci/researchx has no workflow and
+# no run at all - that is the case the clause was amended for (researchx#24,
+# c14093). A half-green pipeline does not open the phase either.
+#
+# Two jobs:
+#   backend  - uv + Python 3.12: ruff, mypy, pytest
+#   frontend - Node 22 + pnpm 12.6.0: typecheck, lint, test, build
+#
+# Runner label: `ubuntu-latest` - the org CI fleet's published label whose
+# image is docker.gitea.com/runner-images:ubuntu-latest (label map read at
+# source: coreci/nextcraft deploy/ci/docker-compose.yaml + deploy/ci/README.md,
+# R-3). The previous string `employee-runner` was a fleet NAME, not a label:
+# the employee fleet's labels are `employee-py` and `employee-coder` (read
+# from a live job log of this seat's own home), and the CI fleet's are node /
+# ubuntu-latest / python / release - no runner carried the old label, so a
+# merged file asking for it could still buy no run.
+#
+# Toolchain: measured, not assumed. From the runner's own logs (job 56393,
+# coreci/nova-platform, 2026-10-26T23:17Z, and job 57005, coreci/inboxos-v1,
+# 2026-10-27T03:01Z): the image carries python 3.12.3, pip, git, node (the
+# actions run in it), pypi REACHABLE and github REACHABLE; actions/checkout@v4,
+# actions/setup-python@v5 and actions/setup-go@v5 all run inside it. It does
+# NOT carry uv or pnpm, so this file installs them: uv from pypi (pip), pnpm
+# 12.6.0 through corepack - the repo's own documented way (README command map).
+# The gates are the repo's documented commands: backend `uv run ruff check src
+# tests`, `uv run mypy src`, `uv run pytest`; frontend `pnpm typecheck`,
+# `pnpm lint`, `pnpm test`, `pnpm build`. The frontend lane mirrors the
+# release image's own recipe (frontend/Dockerfile: node:22-alpine, corepack,
+# pnpm install --frozen-lockfile, pnpm build), so the gate tests what the
+# product ships.
+#
+# Owner of a red leg (the clause asks for the owner of the fix next to the
+# owner of the product line): toolchain / image / dispatch problems ->
+# coreci-sre (employee-runner-fleet + gitea-instance); product-line problems
+# -> coreci-researchx-po. Approval for this file rides the merge request
+# (merge = approval, constitution v1.3).
+
+name: ci
+
+on:
+  push:
+  pull_request:
+    branches: ["main", "milestone/v0.3-hosted"]
+  workflow_dispatch:
+
+jobs:
+  backend:
+    name: "backend (uv, Python 3.12: ruff/mypy/pytest)"
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      # uv is not in the CI image; pypi is reachable from it (measured). The
+      # install is a toolchain leg, not a product gate: the gates still run
+      # from the repo's own committed lockfile (backend/uv.lock).
+      - name: Install uv (from pypi)
+        run: |
+          set -eu
+          python -m pip install --upgrade uv
+          uv --version
+
+      - name: Install dependencies (uv, from the committed lockfile)
+        working-directory: backend
+        run: uv sync --frozen
+
+      - name: Lint (ruff)
+        working-directory: backend
+        run: uv run ruff check src tests
+
+      - name: Typecheck (mypy)
+        working-directory: backend
+        run: uv run mypy src
+
+      - name: Test (pytest)
+        working-directory: backend
+        run: uv run pytest
+
+  frontend:
+    name: "frontend (Next.js on pnpm: typecheck/lint/test/build)"
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Node 22 to mirror the release image (frontend/Dockerfile: node:22).
+      - name: Setup Node 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+
+      - name: Setup Python 3.12 (for the real-stack e2e bridge)
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install uv (from pypi)
+        run: |
+          set -eu
+          python -m pip install --upgrade uv
+
+      # pnpm 12.6.0 is pinned by frontend/package.json `packageManager`;
+      # corepack reads it from there. If the image carries no corepack, npm
+      # installs the same pinned version.
+      - name: pnpm 12.6.0 (corepack, pinned by frontend/package.json)
+        working-directory: frontend
+        run: |
+          set -eu
+          node --version
+          corepack enable pnpm 2>/dev/null || true
+          if ! pnpm --version >/dev/null 2>&1; then
+            npm i -g pnpm@12.6.0
+          fi
+          test "$(pnpm --version)" = "12.6.0"
+
+      - name: Install dependencies (from the committed lockfile)
+        working-directory: frontend
+        run: pnpm install --frozen-lockfile
+
+      # frontend/src/lib/api/e2e-real-stack.test.ts drives the real FastAPI
+      # stack: it spawns `uv run python -m researchx.api.dev_bridge` from
+      # ../backend (loopback :8000, fakes only, zero API keys). Without a
+      # synced backend venv that test cannot come up, so the lane provisions
+      # it. Provisioning only - the backend gates stay in the backend job.
+      - name: Backend venv for the real-stack e2e bridge
+        working-directory: backend
+        run: uv sync --frozen
+
+      - name: Typecheck
+        working-directory: frontend
+        run: pnpm typecheck
+
+      - name: Lint
+        working-directory: frontend
+        run: pnpm lint
+
+      - name: Test
+        working-directory: frontend
+        run: pnpm test
+
+      - name: Build
+        working-directory: frontend
+        env:
+          NEXT_TELEMETRY_DISABLED: "1"
+        run: pnpm build
@@ -0,0 +1,17 @@
+# Build-context hygiene for the backend image (mirrors frontend/.dockerignore).
+.venv
+__pycache__
+*.pyc
+*.pyo
+.pytest_cache
+.mypy_cache
+.ruff_cache
+.git
+.env
+.env.*
+!.env.example
+var
+tests
+Dockerfile
+.dockerignore
+README.md
@@ -0,0 +1,58 @@
+# ResearchX backend — production release image (ciagent release system)
+# Multi-stage: deps -> runtime. FastAPI + uvicorn, single worker, non-root.
+# Built ON the Docker host from the synced source (no local docker required),
+# mirroring frontend/Dockerfile: the build context is backend/.
+#
+# Contracts this image holds (REQ-83, v0.3 line):
+#   - one uvicorn worker — the run registry lives in process memory
+#   - non-root user "researchx" — house recipe, same as frontend/Dockerfile
+#   - the mutable data root is RESEARCHX_DATA_DIR (default /var/lib/researchx);
+#     that is the variable researchx.config.paths.data_root() reads (D-107),
+#     so the volume mount point is the directory the app actually writes
+#   - /healthz is the public health surface (outside /api, never auth-wrapped,
+#     D-103) — the container healthcheck below uses it
+#   - the serving entrypoint is researchx.api.main (the PRODUCTION wiring:
+#     auth_enabled=True and cookie_secure=True hardwired, the live model
+#     factory reading per-user -> server -> keyless credentials from the
+#     runtime env file). researchx.api.app's module-global is the TEST/DEV
+#     factory — it serves FakeModelAdapter and cwd-based storage, so
+#     hosting it would silently ship fakes (P-3 closure, RESEARCH-v03 §8).
+#   - uid/gid 10001 is fixed so the host-side volume chown is deterministic
+#     (the deploy script reads the ownership from this image)
+
+# ---- deps ----
+FROM python:3.12-slim AS deps
+# uv is the repo's package manager (backend/uv.lock). The repo pins no uv
+# version, so this install is bounded to a major range; pin it exactly once
+# the deploy host's uv version is known.
+RUN pip install --no-cache-dir "uv>=0.8,<2"
+WORKDIR /app
+ENV UV_PYTHON_DOWNLOADS=never
+COPY pyproject.toml uv.lock .python-version ./
+COPY src ./src
+# --frozen: use uv.lock as written (no lock rewrite). --no-dev: no test/lint
+# dependencies in the runtime image. --no-editable: copy the package into
+# site-packages instead of linking the package source tree.
+RUN uv sync --frozen --no-dev --no-editable --no-cache --python 3.12
+
+# ---- runtime ----
+FROM python:3.12-slim AS runtime
+WORKDIR /app
+ENV PATH="/app/.venv/bin:$PATH" \
+    PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    RESEARCHX_DATA_DIR=/var/lib/researchx
+COPY --from=deps /app/.venv /app/.venv
+# Non-root app user (house recipe: frontend/Dockerfile runs as researchx).
+RUN addgroup --gid 10001 researchx \
+ && adduser --uid 10001 --gid 10001 --no-create-home --shell /usr/sbin/nologin researchx \
+ && mkdir -p /var/lib/researchx \
+ && chown -R researchx:researchx /var/lib/researchx
+USER researchx
+EXPOSE 8000
+# Public health surface (outside /api, never auth-wrapped). python is already
+# in the image, so the check needs no extra package.
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD ["python", "-c", "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8000/healthz', timeout=3)"]
+# Single worker (REQ-83): the run registry lives in process memory.
+CMD ["uvicorn", "researchx.api.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1", "--proxy-headers"]