feat(kiro): add Kiro CLI session support

[leonardo-claudio]

Summary

Extends the existing Kiro provider to read sessions from Kiro CLI (~/.kiro/sessions/cli/), in addition to the existing Kiro IDE support.

Changes

• Discovery: scans ~/.kiro/sessions/cli/*.jsonl for CLI sessions
• Parser: new JSONL parser for the CLI format (Prompt, AssistantMessage, ToolResults entries)
• MCP detection: tools not in the built-in set are prefixed as mcp__<server>__<tool> (server name read from ~/.kiro/settings/mcp.json)
• Project resolution: uses cwd from session metadata
• Tests: 6 new tests covering CLI parsing, tool detection, MCP, dedup, and project naming
• Docs: updated docs/providers/kiro.md

How Kiro CLI stores data

~/.kiro/sessions/cli/
├── <session-id>.json   # metadata (session_id, cwd, timestamps, model)
└── <session-id>.jsonl  # conversation (line-delimited Prompt/AssistantMessage/ToolResults)

Testing

npx vitest run tests/providers/kiro.test.ts  # 38 tests pass (32 existing + 6 new)
npx tsc --noEmit                              # clean