docs: fix documentation issues and inconsistencies

[jdx]

Summary

• Fix typo "mutiple" -> "multiple" in README.md
• Fix broken anchor link #shell_hook -> #shell-hook in getting-started.md
• Replace TODO placeholders with proper documentation links
• Update config.md with complete configuration options (depends, boot_start)
• Fix cron link format and schedule format in config.md
• Clarify HTTP ready check is not yet implemented in ready-checks.md
• Fix README examples to use implemented ready check options (ready_delay, ready_output)
• Fix field name typo in tests/README.md (retry_delay -> ready_delay)

Test plan

• Verify documentation links work correctly
• Verify configuration examples match actual code behavior

🤖 Generated with Claude Code

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Note

Docs refresh and consistency fixes

• Rewrites docs/architecture.md with a concise system overview, IPC protocol, lifecycle, and watchers (adds diagram)
• Updates docs/config.md with current options (depends, boot_start, cron table) and clarifies ready_delay/ready_output
• Cleans up docs/getting-started.md: fixes shell-hook anchor, adds links to config/boot-start, removes TODOs
• Clarifies in docs/ready-checks.md that HTTP checks are not yet implemented
• Fixes typos and examples in README.md ("multiple", ready check fields) and tests/README.md (field name)
• Adds CLAUDE.md with build/lint/test commands and high-level architecture guidance
• Adds docs/public/favicon.svg

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