feat: add docs

docs/BUILD.bazel

@@ -0,0 +1,18 @@
+load("@stardoc//stardoc:stardoc.bzl", "stardoc")
+
+package(default_visibility = ["//visibility:public"])
+
+stardoc(
+    name = "rules_md",
+    out = "rules.md",
+    input = "//bun:defs.bzl",
+    symbol_names = [
+        "bun_binary",
+        "bun_bundle",
+        "bun_dev",
+        "bun_test",
+        "js_library",
+        "ts_library",
+    ],
+    deps = ["//bun:defs_bzl"],
+)

docs/index.md

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+# rules_bun docs
+
+Documentation site for `rules_bun`.
+
+## Rule reference
+
+- [rules.md](rules.md)
+
+## Regeneration
+
+The rule reference is generated from Starlark rule docstrings:
+
+```bash
+bazel build //docs:rules_md
+cp bazel-bin/docs/rules.md docs/rules.md
+```

docs/rules.md

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+# rules_bun rule reference
+
+This file documents the public rules exported from `@rules_bun//bun:defs.bzl`.
+
+## bun_binary
+
+Runs a JS/TS entry point with Bun as an executable target (`bazel run`).
+
+Attributes:
+
+- `entry_point` (label, required): path to the main JS/TS file to execute.
+- `node_modules` (label, optional): Bun/npm package files in runfiles.
+- `data` (label_list, optional): additional runtime files.
+- `working_dir` (string, default: `"workspace"`, values: `"workspace" | "entry_point"`): runtime working directory.
+
+## bun_dev
+
+Runs a JS/TS entry point in Bun development watch mode (`bazel run`).
+
+Attributes:
+
+- `entry_point` (label, required): path to the main JS/TS file.
+- `watch_mode` (string, default: `"watch"`, values: `"watch" | "hot"`): Bun live-reload mode.
+- `restart_on` (label_list, optional): files that trigger full process restart when changed.
+- `node_modules` (label, optional): Bun/npm package files in runfiles.
+- `data` (label_list, optional): additional runtime files for dev process.
+- `working_dir` (string, default: `"workspace"`, values: `"workspace" | "entry_point"`): runtime working directory.
+
+## bun_bundle
+
+Bundles one or more JS/TS entry points with Bun build.
+
+Attributes:
+
+- `entry_points` (label_list, required): entry files to bundle.
+- `node_modules` (label, optional): Bun/npm package files for resolution.
+- `deps` (label_list, optional): source/library dependencies for transitive inputs.
+- `data` (label_list, optional): additional non-source files needed during bundling.
+- `target` (string, default: `"browser"`, values: `"browser" | "node" | "bun"`): Bun build target.
+- `format` (string, default: `"esm"`, values: `"esm" | "cjs" | "iife"`): module format.
+- `minify` (bool, default: `False`): minifies bundle output.
+- `sourcemap` (bool, default: `False`): emits source maps.
+- `external` (string_list, optional): package names treated as external (not bundled).
+
+## bun_test
+
+Runs Bun tests as a Bazel test target (`bazel test`).
+
+Attributes:
+
+- `srcs` (label_list, required): test source files passed to `bun test`.
+- `node_modules` (label, optional): Bun/npm package files in runfiles.
+- `deps` (label_list, optional): library dependencies required by tests.
+- `data` (label_list, optional): additional runtime files needed by tests.
+
+## js_library
+
+Aggregates JavaScript sources and transitive Bun source dependencies.
+
+Attributes:
+
+- `srcs` (label_list, optional): `.js`, `.jsx`, `.mjs`, `.cjs` files.
+- `deps` (label_list, optional): dependent source libraries.
+
+## ts_library
+
+Aggregates TypeScript sources and transitive Bun source dependencies.
+
+Attributes:
+
+- `srcs` (label_list, optional): `.ts`, `.tsx` files.
+- `deps` (label_list, optional): dependent source libraries.