diff --git a/.flake8 b/.flake8
deleted file mode 100644
index 6d0f5c9a..00000000
--- a/.flake8
+++ /dev/null
@@ -1,3 +0,0 @@
-[flake8]
-max-line-length = 180
-extend-ignore = E203
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6f4354f6..a1c1313f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -187,6 +187,11 @@ jobs:
           ruff check src/ tests/
         continue-on-error: true
 
+      - name: Type check with ty (non-blocking)
+        run: |
+          ty check src/
+        continue-on-error: true
+
   security:
     name: Security Scan
     runs-on: ubuntu-latest
@@ -229,3 +234,32 @@ jobs:
           sarif_file: bandit-report.sarif
           category: bandit
         continue-on-error: true
+
+  docs-reference-sync:
+    name: API Reference In Sync
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          fetch-depth: 0
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b  # v8.1.0
+        with:
+          cache-dependency-glob: "pyproject.toml"
+
+      - name: Regenerate the quartodoc API reference
+        run: |
+          uv run python docs/quartodoc_build.py
+          uv run quartodoc interlinks
+
+      - name: Fail if committed docs/reference is stale
+        run: |
+          if ! git diff --exit-code -- docs/reference/; then
+            echo "::error::docs/reference is out of sync with quartodoc. Run 'uv run python docs/quartodoc_build.py && uv run quartodoc interlinks' locally and commit the result."
+            exit 1
+          fi
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 45545907..a3ce1b7e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -38,15 +38,9 @@ repos:
       - id: ruff
         args: [--fix]
 
-  # Type checking
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.8.0
-    hooks:
-      - id: mypy
-        additional_dependencies:
-          - types-all
-        args: [--no-error-summary]
-        exclude: ^(tests/|docs/)
+  # Type checking now runs in CI via Astral `ty` (non-blocking); the heavy
+  # mypy + types-all pre-commit hook was removed during the tooling-baseline
+  # convergence (roadmap #6).
 
   # YAML validation
   - repo: https://github.com/pre-commit/pre-commit-hooks
diff --git a/REUSE.toml b/REUSE.toml
index c4b5bfcd..92fe3425 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -4,7 +4,7 @@ SPDX-PackageSupplier = "bartzbeielstein <32470350+bartzbeielstein@users.noreply.
 SPDX-PackageDownloadLocation = "https://github.com/sequential-parameter-optimization/spotforecast2-safe"
 
 [[annotations]]
-path = [".flake8", ".gitignore", ".python-version", ".releaserc.json", ".semantic-release-init", "mkdocs.yml", "pyproject.toml", "uv.lock", "junit.xml"]
+path = [".gitignore", ".python-version", ".releaserc.json", ".semantic-release-init", "mkdocs.yml", "pyproject.toml", "uv.lock", "junit.xml"]
 precedence = "aggregate"
 SPDX-FileCopyrightText = "2026 bartzbeielstein"
 SPDX-License-Identifier = "AGPL-3.0-or-later"
diff --git a/pyproject.toml b/pyproject.toml
index bf6a47d9..56c395b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,6 @@ requires-python = ">=3.13"
 dependencies = [
     "astral>=3.2,<4.0",
     "feature-engine>=1.9.3,<2.0",
-    "flake8>=7.3.0,<8.0",
     "holidays>=0.90,<1.0",
     "lightgbm>=4.6.0,<5.0",
     "numba>=0.63.1,<1.0",
@@ -58,8 +57,8 @@ dev = [
     # ── Security scanning ────────────────────────────────────────────────────
     "safety>=3.0.0,<4.0",
     "bandit>=1.8.0,<2.0",
-    # ── Type checking ────────────────────────────────────────────────────────
-    "mypy>=1.8.0,<3.0",
+    # ── Type checking (Astral ty; non-blocking in CI) ────────────────────────
+    "ty>=0.0.29",
 ]
 
 [project.optional-dependencies]
@@ -76,7 +75,7 @@ dev = [
     "nbformat>=5.10.4",
     "safety>=3.0.0,<4.0",
     "bandit>=1.8.0,<2.0",
-    "mypy>=1.8.0,<3.0",
+    "ty>=0.0.29",
 ]
 
 [project.scripts]
@@ -116,3 +115,25 @@ target-version = ["py313"]
 # explicit profile keeps the two formatters in agreement regardless of version.
 [tool.isort]
 profile = "black"
+
+# Ruff config (replaces the removed legacy .flake8). Line length matches black;
+# the default rule set (pyflakes + pycodestyle E/F) is kept. CI runs
+# `ruff check` non-blocking (see .github/workflows/ci.yml).
+[tool.ruff]
+line-length = 88
+target-version = "py313"
+
+[tool.coverage.run]
+branch = true
+source = ["src/spotforecast2_safe"]
+
+[tool.coverage.report]
+# Ratchet: lock in the current ~71% coverage (measured locally) so it cannot
+# regress; 68 leaves a small margin for platform variance on CI. Raise
+# deliberately as coverage improves. CI runs pytest with --cov, enforcing this.
+fail_under = 68
+
+# Astral `ty` type checker. Run non-blocking in CI (continue-on-error) so it
+# surfaces type debt without failing the build; tighten to a gate later.
+[tool.ty.environment]
+python-version = "3.13"