chore: add Teal/VS Code config, tl check workflow and modding notes

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

.gitignore

@@ -0,0 +1,2 @@
+tlconfig.lua
+.claude/settings.local.json

.vscode/extensions.json

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+{
+	"recommendations": [
+		"pdesaulniers.vscode-teal"
+	]
+}

CLAUDE.md

@@ -11,3 +11,10 @@ Default five-role vocabulary (`needs-triage`, `needs-info`, `ready-for-agent`, `
 ### Domain docs
 
 Single-context: one `CONTEXT.md` + `docs/adr/` at the repo root. See `docs/agents/domain.md`.
+
+## Modding
+
+- The mod is `mod/` (junctioned into the game's `staging_area` as `haylan_tf3_overtake`). Scripts are Teal (`.tl`, typed Lua); `mod.json` goes at the root of `mod/`.
+- Type-check with `tl check mod/<file>.tl` (run from the repo root; it reads `tlconfig.lua`). `tl` is type-check only; whether the game compiles `.tl` itself is undocumented.
+- `tlconfig.lua` and `.claude/settings.local.json` are machine-local and gitignored. Copy `tlconfig.template.lua` to `tlconfig.lua` and replace `<tf3_install_folder>` with the game's install path (here `D:/SteamLibrary/steamapps/common/Transport Fever 3/`).
+- Authoritative API types: `<install>/api/tealdef` and `<install>/base/tealdef`. Read them, and the offline docs in `docs/reference/`, before guessing an API. Research notes are in `docs/research/`; vocabulary in `CONTEXT.md`.

all_def.tl

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+require "api_def"
+require "content_def"
+
+-- list your mods here, if you provide your own d.tl definitions
+-- require "example_mod_1"

tlconfig.template.lua

@@ -0,0 +1,11 @@
+return {
+	include_dir = {
+		-- ensure to set proper paths for the definitions for the base game
+		"<tf3_install_folder>api/tealdef",
+		"<tf3_install_folder>base/tealdef",
+
+		-- list your mods here, if you provide your own d.tl definitions
+		-- "example_mod_1",
+	},
+	global_env_def = "all_def"
+}