[js] 0.19.0

feat: centralize agent config with lino-arguments, always log resolved config (#227)

• Added lino-arguments for unified env var resolution (case-insensitive, .lenv support)
• Created centralized AgentConfig module as single source of truth for all configuration
• All env vars resolved via getenv() from lino-arguments (CLI args > env vars > .lenv > defaults)
• Always log resolved configuration as JSON at startup for debugging
• Moved all direct process.env reads (MCP, read tool) into centralized Flag module
• --verbose is now the most reliable flag: triple-checked via in-memory, AgentConfig, and env var
• Removed all OPENCODE_* env var support; use LINK_ASSISTANT_AGENT_* exclusively

Related Pull Request: #228

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