fix: strip comments before scanning for missing imports (#676)

* fix: strip comments before scanning for missing imports

The scanForMissingImports regex matched require() and import() patterns
inside JSDoc comments, causing false-positive missing module detection.
A documented path like `require('./commands/proactive.js')` in a comment
was resolved from the wrong directory, marked as missing, then the global
onResolve handler intercepted ALL imports of that specifier — including
valid ones — replacing them with truthy noop stubs that broke runtime.

Strip block (/* */) and line (//) comments from source before scanning.

* fix: repair 10 pre-existing test failures

- promptIdentity.test.ts: define MACRO global (ISSUES_EXPLAINER etc.)
  for test mode where Bun.define build-time replacements aren't active
- context.test.ts: clear OPENAI_MODEL env var in each test — the user's
  environment (e.g. OPENAI_MODEL=github_copilot/gpt-5.4) polluted the
  provider-qualified lookup, returning wrong context windows
- openclaudePaths.test.ts: set CLAUDE_CONFIG_DIR to force .openclaude
  path when ~/.openclaude doesn't exist on the test machine

scripts/build.ts

@@ -367,9 +367,17 @@ export const SeverityNumber = {};
               const full = pathMod.join(dir, ent.name)
               if (ent.isDirectory()) { walk(full); continue }
               if (!/\.(ts|tsx)$/.test(ent.name)) continue
-              const code: string = fs.readFileSync(full, 'utf-8')
+              const rawCode: string = fs.readFileSync(full, 'utf-8')
               const fileDir = pathMod.dirname(full)
 
+              // Strip comments before scanning for imports/requires.
+              // The regex scanner matches require()/import() patterns
+              // inside JSDoc comments, causing false-positive missing
+              // module detection that breaks the build with noop stubs.
+              const code = rawCode
+                .replace(/\/\*[\s\S]*?\*\//g, '')  // block comments
+                .replace(/\/\/.*$/gm, '')           // line comments
+
               // Collect static imports: import { X } from '...'
               for (const m of code.matchAll(/import\s+(?:\{([^}]*)\}|(\w+))?\s*(?:,\s*\{([^}]*)\})?\s*from\s+['"](.*?)['"]/g)) {
                 checkAndRegister(m[4], fileDir, m[1] || m[3] || '')