feat: add build system, stubs, and npm packaging — openclaude is now runnable

- package.json with all 70+ dependencies
- Bun build script with feature flag shims, native module stubs, otel externals
- Stubs for ~15 missing source files (snapshot gaps)
- tsconfig.json for TypeScript
- bin/openclaude entry point
- Builds to single 19MB dist/cli.mjs
- Verified: --version and --help work

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/tools/REPLTool/REPLTool.ts

@@ -0,0 +1,3 @@
+// Stub
+export default null
+export const REPLTool = null

src/tools/SuggestBackgroundPRTool/SuggestBackgroundPRTool.ts

@@ -0,0 +1,3 @@
+// Stub
+export default null
+export const SuggestBackgroundPRTool = null

src/tools/TungstenTool/TungstenLiveMonitor.ts

@@ -0,0 +1,2 @@
+// Stub — TungstenTool not included in source snapshot (internal tool)
+export const TungstenLiveMonitor = null

src/tools/TungstenTool/TungstenTool.ts

@@ -0,0 +1,2 @@
+// Stub
+export const TungstenTool = null

src/tools/VerifyPlanExecutionTool/VerifyPlanExecutionTool.ts

@@ -0,0 +1,3 @@
+// Stub
+export default null
+export const VerifyPlanExecutionTool = null

src/tools/WorkflowTool/constants.ts

@@ -0,0 +1,2 @@
+// Stub — WorkflowTool not included in source snapshot
+export const WORKFLOW_TOOL_NAME = 'WorkflowTool'