#22764: docs: comprehensive cron system study for portability reference

Complete analysis of OpenClaw's cron scheduling system including: - Full architecture diagram and dependency map - All TypeScript types with annotations in Portuguese - Persistence layer (atomic JSON save/load) - Schedule computation (at/every/cron with timezone) - Timer loop mechanics, backoff, concurrency - Dependency injection pattern (CronServiceDeps) - Step-by-step portability guide with code examples - File-by-file classification (keep vs discard) https://claude.ai/code/session_016k8HKF3rSVgtqCx2xGur38 ## Summary Describe the problem and fix in 2–5 bullets: - Problem: - Why it matters: - What changed: - What did NOT change (scope boundary): ## Change Type (select all) - [ ] Bug fix - [ ] Feature - [ ] Refactor - [ ] Docs - [ ] Security hardening - [ ] Chore/infra ## Scope (select all touched areas) - [ ] Gateway / orchestration - [ ] Skills / tool execution - [ ] Auth / tokens - [ ] Memory / storage - [ ] Integrations - [ ] API / contracts - [ ] UI / DX - [ ] CI/CD / infra ## Linked Issue/PR - Closes # - Related # ## User-visible / Behavior Changes List user-visible changes (including defaults/config). If none, write `None`. ## Security Impact (required) - New permissions/capabilities? (`Yes/No`) - Secrets/tokens handling changed? (`Yes/No`) - New/changed network calls? (`Yes/No`) - Command/tool execution surface changed? (`Yes/No`) - Data access scope changed? (`Yes/No`) - If any `Yes`, explain risk + mitigation: ## Repro + Verification ### Environment - OS: - Runtime/container: - Model/provider: - Integration/channel (if any): - Relevant config (redacted): ### Steps 1. 2. 3. ### Expected - ### Actual - ## Evidence Attach at least one: - [ ] Failing test/log before + passing after - [ ] Trace/log snippets - [ ] Screenshot/recording - [ ] Perf numbers (if relevant) ## Human Verification (required) What you personally verified (not just CI), and how: - Verified scenarios: - Edge cases checked: - What you did **not** verify: ## Compatibility / Migration - Backward compatible? (`Yes/No`) - Config/env changes? (`Yes/No`) - Migration needed? (`Yes/No`) - If yes, exact upgrade steps: ## Failure Recovery (if this breaks) - How to disable/revert this change quickly: - Files/config to restore: - Known bad symptoms reviewers should watch for: ## Risks and Mitigations List only real risks for this PR. Add/remove entries as needed. If none, write `None`. - Risk: - Mitigation: <!-- greptile_comment --> <h3>Greptile Summary</h3> This PR adds comprehensive Portuguese-language documentation of OpenClaw's cron scheduling system to serve as a reference for porting the cron functionality to other projects. The 1,214-line study document (`CRON_SYSTEM_STUDY.md`) provides: - Complete architecture diagrams showing the dependency injection pattern - Detailed type definitions with Portuguese annotations - Persistence layer documentation (atomic JSON operations) - Schedule computation logic (at/every/cron with timezone support) - Timer loop mechanics, error backoff, and concurrency control - Step-by-step portability guide with code examples - File-by-file classification identifying which files are reusable vs OpenClaw-specific The documentation accurately reflects the actual codebase structure, correctly identifying the core portable modules (types.ts, schedule.ts, store.ts, timer.ts, etc.) and OpenClaw-specific components (session-reaper.ts, isolated-agent/, CLI tools). The technical details match the actual implementation, including the Promise-chain locking mechanism in `locked.ts` and the type definitions in `types.ts`. This is documentation-only with no code changes or behavioral impact. <h3>Confidence Score: 5/5</h3> - Safe to merge - documentation-only change with no code modifications - This PR adds only documentation and makes no changes to any executable code, configuration, or dependencies. The documentation accurately reflects the codebase structure based on verification of referenced files. No user-facing behavior, security surface, or runtime functionality is affected. - No files require special attention _{Last reviewed commit: 465b830} <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->