chore: migrate cli distribution from npm to bun executable

Migrate HAPI CLI from npm-based distribution to Bun single-executable format:
- Remove npm bin wrappers (bin/happy.mjs, bin/happy-mcp.mjs)
- Simplify package.json: remove npm publish config (exports, main, module, types, files, publishConfig)
- Update bin entry to point to TypeScript source (src/index.ts)
- Migrate shebang from Node to Bun (#!/usr/bin/env bun)
- Simplify build scripts: remove npm-specific steps (pkgroll, prepublishOnly, release-it)
- Update spawnHappyCLI to support compiled binaries and development TypeScript mode
- Update daemon/doctor diagnostics for new process detection logic
- Production: use `bun build --compile` for single-executable releases
- Development: run TypeScript directly via `bun src/index.ts` or `tsx src/index.ts`

cli/bin/happy-mcp.mjs

@@ -1,30 +0,0 @@
-#!/usr/bin/env node
-
-import { execFileSync } from 'child_process';
-import { fileURLToPath } from 'url';
-import { runHappyMcpStdioBridge } from '../dist/codex/happyMcpStdioBridge.mjs';
-
-// Ensure Node flags to reduce noisy warnings on stdout (which could interfere with MCP)
-const hasNoWarnings = process.execArgv.includes('--no-warnings');
-const hasNoDeprecation = process.execArgv.includes('--no-deprecation');
-
-if (!hasNoWarnings || !hasNoDeprecation) {
-  const entrypoint = fileURLToPath(import.meta.url);
-
-  try {
-    execFileSync(process.execPath, [
-      '--no-warnings',
-      '--no-deprecation',
-      entrypoint,
-      ...process.argv.slice(2)
-    ], {
-      stdio: 'inherit',
-      env: process.env
-    });
-  } catch (error) {
-    process.exit(error.status || 1);
-  }
-} else {
-  // Already have desired flags; run bridge directly
-  await runHappyMcpStdioBridge(process.argv.slice(2));
-}

cli/bin/happy.mjs

@@ -1,35 +0,0 @@
-#!/usr/bin/env node
-
-import { execFileSync } from 'child_process';
-import { fileURLToPath } from 'url';
-import { join, dirname } from 'path';
-
-// Check if we're already running with the flags
-const hasNoWarnings = process.execArgv.includes('--no-warnings');
-const hasNoDeprecation = process.execArgv.includes('--no-deprecation');
-
-if (!hasNoWarnings || !hasNoDeprecation) {
-  // Get path to the actual CLI entrypoint
-  const projectRoot = dirname(dirname(fileURLToPath(import.meta.url)));
-  const entrypoint = join(projectRoot, 'dist', 'index.mjs');
-  
-  // Execute the actual CLI directly with the correct flags
-  try {
-    execFileSync(process.execPath, [
-      '--no-warnings',
-      '--no-deprecation',
-      entrypoint,
-      ...process.argv.slice(2)
-    ], {
-      stdio: 'inherit',
-      env: process.env
-    });
-  } catch (error) {
-    // execFileSync throws if the process exits with non-zero
-    process.exit(error.status || 1);
-  }
-} else {
-  // We're running Node with the flags we wanted, import the CLI entrypoint
-  // module to avoid creating a new process.
-  import("../dist/index.mjs");
-}