Add Lateralus.gitignore

[bad-antics]

What does this PR do?

Adds a Lateralus.gitignore template covering the artefacts produced by the Lateralus toolchain.

Why this change applies to everyone working with the technology

Lateralus is a statically typed, pipeline-oriented programming language. It has:

• A public, open-source reference compiler at https://github.com/bad-antics/lateralus-lang (MIT) with Python, C, JS, LLVM, WASM and x86 backends
• An official LSP, formatter and linter
• A VS Code extension (lateralus.lateralus-lang)
• A standard library and package manager (ltl add, ltl build, ltl bench)

Any developer creating a new Lateralus project today needs to ignore the same set of files — compiled output, caches, build/dist directories, benchmark JSON, LSP scratch files — and they all come from the canonical toolchain, not anything project-specific.

What's in the template

*.ltlc, *.ltbc          compiled source / bytecode  (emitted by `ltl build`)
.ltl-cache/             incremental compile cache  (used by the reference compiler)
.lateralus-cache/       LSP & formatter cache
build/, dist/           default build and publish directories
.ltl-deps/              package manager dependency tree
benchmark_results.json  output of `ltl bench`
*.prof                  profiler output
*.ltl.swp, *.ltl.bak    editor scratch files produced by the LSP

Scope

Per CONTRIBUTING.md, I've kept it tight:

• ✅ Only Lateralus-specific rules — no Python, OS, or editor rules (those belong in their own templates)
• ✅ No duplicates
• ✅ Single new file, no edits to other templates
• ✅ Each section has a one-line comment explaining why the pattern is ignored

References

• Reference implementation & docs: https://github.com/bad-antics/lateralus-lang
• ltl build / ltl bench toolchain reference: https://github.com/bad-antics/lateralus-lang/tree/main/docs
• File extension registry: .ltl source, .ltlc compiled, .ltbc bytecode (see the language's .gitattributes template)

Happy to iterate on any of the entries if you'd prefer a shorter list or different formatting.

[Copilot]

Pull request overview

Adds a new Lateralus.gitignore template to ignore build outputs, caches, dependencies, benchmark/profiler artifacts, and LSP/editor scratch files produced by the Lateralus toolchain.

Changes:

• Introduces Lateralus.gitignore with ignore rules for compiler outputs (*.ltlc, *.ltbc)
• Ignores toolchain caches and dependency tree directories (.ltl-cache/, .lateralus-cache/, .ltl-deps/)
• Ignores common toolchain output artifacts (build/dist dirs, benchmark/prof files, LSP scratch files)

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[Copilot]

The header comment uses a Unicode em dash (—). The rest of the templates in this repo appear to stick to plain ASCII punctuation; using a regular hyphen (e.g., "# Lateralus - …") would keep formatting consistent and avoid any potential encoding/tooling issues in consumers that assume ASCII.

Suggested change

	# Lateralus — https://github.com/bad-antics/lateralus-lang
	# Lateralus - https://github.com/bad-antics/lateralus-lang

[dooleydevin]

Lateralus looks cool, but a language that has been open-sourced for 3 weeks doesn't have enough of a following to warrant inclusion in this repo. Apologies -- going to close this out.