test: cover MCP server tools

[Heazzy500]

Summary

• extract the web_search, ai_summarize, and check_balance handlers into testable functions
• wire the MCP server to use those handlers
• add Vitest coverage for successful responses and error paths, including Horizon 404 and Groq failures

Verification

• vitest run (4 tests passed)
• TypeScript node config check passed

Closes #28

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[Heazzy500]

@Emmy123222 The merge conflicts for this PR have been resolved against the latest main and pushed to Heazzy500:fix/issue-28. Please re-run/inspect CI when available.

[AbuJulaybeeb]

@Emmy123222 The merge conflicts for this PR have been resolved against the latest main and pushed to Heazzy500:fix/issue-28. Please re-run/inspect CI when available.

nope.
pull form main, rebase and push

[Heazzy500]

@Emmy123222 @Heazzy500 Rebased safely onto current upstream main and pushed the resolved branch. New verified head: 653a07a. The PR references Fixes #28. Verification: dependency manifest conflicts resolved using upstream’s current lockfile/tool versions while preserving the MCP test files; git diff --check passed. Please rerun/inspect CI.

[AbuJulaybeeb]

@Emmy123222 @Heazzy500 Rebased safely onto current upstream main and pushed the resolved branch. New verified head: 653a07a. The PR references Fixes #28. Verification: dependency manifest conflicts resolved using upstream’s current lockfile/tool versions while preserving the MCP test files; git diff --check passed. Please rerun/inspect CI.

The branch still cannot be rebased due to conflicts.

[Heazzy500]

@Emmy123222 Merge conflicts resolved for this PR against latest main. Rebased fix/issue-28 onto upstream/main and pushed — new head: 1eb2c61. Conflict files: mcp-server/index.ts, package.json, package-lock.json. Validation: git diff --check clean; working tree clean; reviewed merged MCP test coverage (handlers.ts, handlers.test.ts, vitest.config.ts) — no node_modules present so ran light validation (no test run). Please review / re-run CI when convenient. Thanks!

[Heazzy500]

@Emmy123222 @Heazzy500 PR #76 was rebased onto the current upstream main and the duplicate package-sync commits were removed; the focused MCP implementation/test changes remain in commit db59d06. The branch has been force-updated and is ready for CI/review.