feat: add OptionResolver utility and --silent option

[MaxwellCalkin]

Summary

• Creates reusable OptionResolver utility class (src/utils/option-resolver.ts) that handles the standard configuration priority chain (CLI → ENV → Interactive → Project → User) as specified in CLAUDE.md
• Adds global --silent / -s option that skips interactive prompts and uses config defaults (errors if a required value is missing)
• Refactors chat and simple-organization-setup commands to use OptionResolver, eliminating duplicated config resolution logic (net -18 lines)

Details

The OptionResolver class:

• Lazily loads project and user config on first resolve() call
• Supports custom validators per option
• Supports environment variable resolution
• Handles both interactive (prompt with defaults) and silent (use defaults or error) modes

Closes #2

Test plan

• Run sensay chat interactively — verify replica name prompt appears with config default
• Run sensay chat -s -r "MyReplica" -m "hello" — verify silent mode works
• Run sensay chat -s without config — verify error for missing required option
• Run sensay simple-organization-setup interactively — verify userName/userEmail prompts
• Run sensay simple-organization-setup -s with config file — verify silent mode uses defaults
• Verify sensay --help shows the new -s, --silent option

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