Validate MMED schedule data via the shared pre-commit hook (#54)

.github/workflows/schedule-validate.yml

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+# Validate MMED's schedule data (#54) with the SHARED validator, via pre-commit.
+#
+# MMED keeps its own schedule data in _data/schedule/mmed/<year>.yml. The validation
+# logic (schema, referential checks, role tokens) lives once in ICI3D.github.io and is
+# pulled in as a pinned pre-commit hook (.pre-commit-config.yaml) — the SAME hook
+# contributors run locally with `pre-commit install`. People records still come from
+# the ICI3D.github.io submodule for now (see the hook's --people-dir).
+name: Validate schedule data
+
+on:
+  pull_request:
+    paths:
+      - '_data/schedule/**'
+      - '.pre-commit-config.yaml'
+  push:
+    branches: ['gh-pages']
+    paths:
+      - '_data/schedule/**'
+      - '.pre-commit-config.yaml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout (with the ICI3D.github.io submodule = shared people records)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - uses: pre-commit/action@v3.0.1
+        with:
+          extra_args: validate-schedule --all-files

.pre-commit-config.yaml

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+# Validate MMED's schedule data against the shared, versioned ICI3D schema.
+#
+# The validator, JSON Schema, and role vocabulary live once in ICI3D.github.io and
+# are pulled in here as a pinned pre-commit hook (no vendoring). Contributors get the
+# same check CI runs, locally on every commit:
+#
+#     pip install pre-commit && pre-commit install
+#
+# Instructor keys resolve against the shared people records from the ICI3D.github.io
+# submodule (--people-dir), the same records the Jekyll build reads. When MMED owns
+# its own _data/team, drop the submodule and the --people-dir override.
+repos:
+  # INTERIM: points at the fork branch until ICI3D/ICI3D.github.io#59 merges; then
+  # flip repo -> https://github.com/ICI3D/ICI3D.github.io and rev -> the merge sha/tag.
+  - repo: https://github.com/WestonVoglesonger/ICI3D.github.io
+    rev: 271a817244057f0b90fb64a2724e645b20827099
+    hooks:
+      - id: validate-schedule
+        args: [--people-dir, ICI3D.github.io/_data/team]