Chore/refactor

[Sharmaz]

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Summary

Refactor tools to comply with MCP 2025 specification standards and update dependencies to latest
versions.

Changes

Error Handling

• Add centralized fetchPhoenixd utility with proper try/catch for network errors
• All tools now return isError: true on failures (MCP spec requirement)
• HTTP status validation before processing responses

Dependencies

• Update @modelcontextprotocol/sdk to ^1.25.3
• Update zod to ^4.0.0
• Add engines field requiring Node >= 18

CI/CD

• Migrate npm publishing from classic tokens to OIDC trusted publishing
• Update workflows to Node 24
• Simplify linter workflow

Code Quality

• Refactor all 17 tools to use the new fetch utility
• Consistent error response formatting across all tools
• Update .gitignore and fix dependency vulnerabilities

Test plan

• Build passes (npm run build)
• Lint passes (npm run lint)
• Manual testing with MCP Inspector
• Verify npm publish with OIDC after merge

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