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>

.gitignore

@@ -0,0 +1,17 @@
+build
+**.zip
+out.ppm
+
+# self-hosted front-end binaries (built by ./build-cli.sh) and their output
+/ludic
+/ludicc
+/bin/
+
+# editor toolchain build artifacts
+tools/editors/vscode/node_modules/
+tools/editors/vscode/*.vsix
+tools/editors/jetbrains/.gradle/
+tools/editors/jetbrains/build/
+
+# IntelliJ plugin SDK sandbox (tools/editors/jetbrains)
+.intellijPlatform/