Baseline: Ludic compiler + toolchain, Phase 1 syntax fixes complete

Self-hosted compiler (selfhost/*.ludic), runtime, examples, editor tooling,
and docs. Phase 1 of the syntax-redesign cohesion pass has landed:
edge-system fix, signature-query, when-alias, and the documentation truth-pass.
Suite green (14/14), C-free bootstrap fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

selfhost/build.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# build.sh — assemble the self-host compiler from its fragments and compile it
+# with the given ludicc (default: the C build/ludicc).
+#   ./selfhost/build.sh [ludicc] [outbin]
+set -u
+cd "$(dirname "$0")/.."
+LC="${1:-build/ludicc}"
+OUT="${2:-build/selfhost}"
+mkdir -p build
+FRAGS="selfhost/str.ludic
+selfhost/buf.ludic
+selfhost/io.ludic
+selfhost/ast.ludic
+selfhost/lex.ludic
+selfhost/parse.ludic
+selfhost/parse_game.ludic
+selfhost/emit_core.ludic
+selfhost/emit_head.ludic
+selfhost/emit_addr.ludic
+selfhost/emit_intrin.ludic
+selfhost/emit_intrin2.ludic
+selfhost/emit_math.ludic
+selfhost/emit_new.ludic
+selfhost/emit_expr.ludic
+selfhost/emit_stmt.ludic
+selfhost/emit_ecs.ludic
+selfhost/emit_query.ludic
+selfhost/emit_spawn.ludic
+selfhost/emit_game.ludic
+selfhost/emit_machine.ludic
+selfhost/emit_save.ludic
+selfhost/emit_ui.ludic
+selfhost/emit_decl.ludic
+selfhost/main.ludic"
+SRC=build/selfhost.ludic
+{ echo "game SelfHost {"; for f in $FRAGS; do cat "$f"; echo; done; echo "}"; } > "$SRC"
+# the compiler emits IR to stdout; clang assembles and links it
+"$LC" "$SRC" > "$OUT.ll" 2>/dev/null && ${LUDIC_CC:-clang} "$OUT.ll" -o "$OUT" 2>/dev/null
+rc=$?; rm -f "$OUT.ll"; [ $rc -eq 0 ]