feat(core): event queue, Ethernet, switch, ARP, IPv4, ICMP, routing and firewall

First slice of the TypeScript port of the filius-ipad runtime engine,
with 29 tests ported from the Swift suite. Parts not ported yet throw
NotPortedError instead of guessing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/code_language_allow.txt

@@ -0,0 +1,15 @@
+# Words only this repository may use, in addition to the dashboard's
+# scripts/code_language_allow.txt. Format: `path::word` (bound to one path or
+# path prefix) or a bare word (anywhere). Each entry says why.
+#
+# The .fls format is Java's XMLEncoder output: its class and property names
+# (filius.hardware.knoten.Vermittlungsrechner, GUIKnotenItem, ipAdresse …)
+# are fields of a foreign API and keep their German names — in packages/fls
+# only.
+#
+# Java FILIUS class and package names, cited in the provenance header of each
+# ported file and in comments that point at the Java behaviour they copy.
+vermittlungsrechner
+verbindung
+netzzugangsschicht
+vermittlungsschicht

scripts/hooks/pre-commit

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+#!/bin/sh
+# Keeps German code out of this repository — the same rule as in the dashboard
+# (its CLAUDE.md). The checker is borrowed from the dashboard this repository is
+# a submodule of; CODE_LANGUAGE_ROOT points it at our files, and words only we
+# may use (the Java class names of the .fls format) stand in
+# scripts/code_language_allow.txt.
+#
+# Enable:  npm run hooks
+# Bypass:  git commit --no-verify
+top="$(git rev-parse --show-toplevel)"
+super="$(git rev-parse --show-superproject-working-tree 2>/dev/null)"
+checker="$super/scripts/check_code_language.py"
+if [ -z "$super" ] || [ ! -f "$checker" ]; then
+    echo "pre-commit: not inside the dashboard checkout, language check skipped"
+    exit 0
+fi
+CODE_LANGUAGE_ROOT="$top" python3 "$checker" --changed HEAD || {
+    echo
+    echo "German code in the commit. Glossary: knowledge/plans/CODE_ENGLISH_REFACTOR.md §3 (dashboard)"
+    echo "Commit anyway: git commit --no-verify"
+    exit 1
+}