fix: refactor config.ts env var loading to table-driven pattern

[himerus]

Summary

packages/core/src/config.ts lines 95-124 contain 10 nearly identical if-blocks for loading env vars:

if (process.env['MCP_WC_CEM_PATH'] !== undefined) { config.cemPath = process.env['MCP_WC_CEM_PATH']; }
if (process.env['MCP_WC_PROJECT_ROOT'] !== undefined) { config.projectRoot = process.env['MCP_WC_PROJECT_ROOT']; }
// ... 8 more identical patterns

This is duplicate code that's error-prone (typos in env var names would be silent). Should be refactored to a lookup table mappi...

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Reviewing files that changed from the base of the PR and between 37eca94 and 2bbbfb7.

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• packages/core/src/config.ts

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