Add per-file daily/weekly/monthly/yearly task scheduler

[Copilot]

Summary

Adds a per-file task scheduler so mtgBot can contain, control, and execute daily, weekly, monthly, and yearly tasks for every file in the project. For each file the scheduler derives a set of tasks grouped by cadence, each bundling:

• todos — human-readable checklist items describing the intent
• actions — machine-readable action identifiers mtgBot can react to
• commands — concrete, whitelisted npm commands mtgBot can execute

The three verbs from the request map directly to the tooling:

• contain → the tasks/tasks.json manifest
• control → --list <cadence> filtering
• execute → --execute <cadence>, which only runs commands on a safe, auditable whitelist

Changes

• scripts/taskScheduler.js — engine that walks the tree (excluding deps/VCS/build output) and generates per-file tasks for all four cadences, with file-type profiles (JavaScript, JSON, Markdown, web, data, assets, default fallback). Supports --generate (default), --dry-run, --list, and --execute.
• scripts/__tests__/taskScheduler.test.js — 16 unit + integration tests.
• tasks/ — generated output: tasks.json manifest, daily.md/weekly.md/monthly.md/yearly.md, and a README.md (271 files scheduled).
• package.json — new scripts: tasks, tasks:dry, tasks:daily, tasks:weekly, tasks:monthly, tasks:yearly.
• .github/workflows/monthly-tasks.yml and yearly-tasks.yml — new scheduled workflows matching the existing daily/weekly automation pattern.
• README — documented under Maintenance & Automation plus a dedicated tasks/README.md.

Validation

• npm run lint — 0 errors
• npm test — 90/90 pass (6 suites)
• npm run validate:json — all valid (including new tasks.json)
• Secret scan — clean; CodeQL (javascript + actions) — 0 alerts

Usage

npm run tasks           # regenerate tasks/tasks.json and cadence docs
npm run tasks:dry       # audit only, no files written
npm run tasks:daily     # execute whitelisted daily commands (weekly/monthly/yearly too)
node scripts/taskScheduler.js --list weekly   # inspect a cadence

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