chore: add changeset for eslint-plugin-treeshake

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryanbas21

.changeset/eslint-plugin-treeshake.md

@@ -0,0 +1,18 @@
+---
+'@wolfcola/eslint-plugin-treeshake': minor
+---
+
+Add @wolfcola/eslint-plugin-treeshake - an ESLint plugin that flags code patterns known to break tree-shaking.
+
+Implements a single rule `wolfcola/no-treeshake-hazard` with static checks for:
+
+- TypeScript enums (with `as const` suggestion)
+- Unannotated top-level calls (with `/*#__PURE__*/` autofix)
+- Prototype/property mutations at module scope
+- Global object assignments
+- CommonJS patterns in ESM files
+- Missing `sideEffects` field in package.json
+
+Includes opt-in `bundleCheck` mode that runs `@wolfcola/treeshake-check`'s full Rollup analysis and maps results back to source locations, with deduplication against static findings.
+
+Ships with `recommended` (warn) and `strict` (error + bundleCheck) preset configs.