Add --json-standard option for opencode/claude output formats

[konard]

Summary

• Add new --json-standard CLI option with opencode (default) and claude choices
• Implement JSON format adapters in src/json-standard/index.ts
• Add comprehensive unit tests for both formats (17 tests)
• Update README.md and EXAMPLES.md with documentation
• Bump version to 0.0.9

JSON Output Standards

The agent now supports two JSON output format standards:

OpenCode Standard (default)

• Format: Pretty-printed JSON (human-readable with indentation)
• Event Types: step_start, step_finish, text, tool_use, error
• Timestamps: Unix milliseconds (number)
• Session ID: sessionID (camelCase)

Claude Standard (experimental)

• Format: NDJSON (Newline-Delimited JSON - compact, one JSON per line)
• Event Types: init, message, tool_use, tool_result, result
• Timestamps: ISO 8601 strings
• Session ID: session_id (snake_case)

Usage

# Default OpenCode format (unchanged behavior)
echo "hi" | agent

# Explicit OpenCode format
echo "hi" | agent --json-standard opencode

# Claude CLI compatible format (experimental)
echo "hi" | agent --json-standard claude

Test Plan

• Unit tests for JSON standard module (tests/json-standard-unit.test.js)
• Integration tests for OpenCode format (tests/json-standard-opencode.test.js)
• Integration tests for Claude format (tests/json-standard-claude.test.js)
• Verify --help shows new option correctly
• Verify default behavior unchanged (opencode format)

Fixes #20

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[konard]

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✅ Merge Conflict Resolved

Successfully merged main branch into issue-20 branch and resolved all conflicts.

Changes Made

Merge Resolution:

• Integrated both imports: json-standard module and McpCommand
• Updated runAgentMode to validate and pass jsonStandard parameter
• Modified runServerMode and runDirectMode to accept jsonStandard parameter
• Maintained event handler functionality for both output formats (opencode and claude)
• Preserved command execution check from main branch refactoring

Test Results:
All JSON standard tests passing locally:

• ✅ json-standard-unit.test.js: 17 pass
• ✅ json-standard-opencode.test.js: 9 pass
• ✅ json-standard-claude.test.js: 11 pass

PR Status:

• ✅ All conflicts resolved
• ✅ All JSON standard features working
• ✅ Mergeable with main
• ✅ Ready for review

The --json-standard option now works correctly alongside the new MCP command structure from main.

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