DanielXMoore / Hera

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Dev: Convert LSP to Civet (#67)

### LSP: full rewrite from TypeScript to Civet

The entire LSP implementation has been converted from TypeScript to Civet:

- Deleted `lsp/src/extension.ts`, `server.ts`, `util.ts`, `experimental.ts`
- Replaced with `lsp/source/extension.civet`, `server.civet`, `util.civet`
- E2e and test files likewise converted from `.ts` to `.civet`
- Build system switched from `.esbuild.mjs` to `.esbuild.civet`
- ESLint config removed (`.eslintrc.js`, `.eslintignore`) — no longer needed
- Added `CONTRIBUTING.md` and updated `LICENSE`
- Added e2e fixture files (`invalid.hera`, `valid.hera`, `completion.hera`)

### LSP: dependency updates

| Package | Before | After |
|---|---|---|
| `vscode-languageclient` | 7.0.0 | 9.0.1 |
| `vscode-languageserver` | 7.0.0 | 9.0.1 |
| `typescript` | 5.9.3 | 6.0.2 |
| `@types/vscode` | 1.110.0 | 1.115.0 |
| `mocha` | 9.2.2 | 11.7.5 |

- `server.civet`: `end.character` was passed as a string (regex capture group) instead of a number, causing `vscode-languageclient` v9 to throw `Invalid arguments` when converting diagnostics. Fixed with `+character`.

### Hera root: TypeScript 6.0 compatibility

- `source/compiler.civet`: `SourceMap` constructor now requires a `sourceFileName` argument; `.json()` no longer accepts a second argument — both updated to match the new `@danielx/civet` API
- `source/register/tsc/transpile.civet`: TypeScript 6.0 now emits `"use strict"` for non-module files when using `ModuleKind.Preserve`. Added `alwaysStrict: false` + `ignoreDeprecations: "6.0"` to preserve prior behavior
- `tsconfig.json`: added `"types": ["node"]`

### Dev

- Improved VSCode launch script so in-editor breakpoints work in civet source

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