feat: add V1 slash commands (list, get, logs, delete)

[tsaiggo]

Summary

Add 4 slash commands to the opencode-scheduler plugin, enabling users to interact with scheduled jobs directly via /scheduler-* commands instead of remembering tool names and argument formats.

Why

Currently, users must rely on natural language prompts or know the exact tool names (list_jobs, get_job, etc.) to manage scheduled jobs. Slash commands provide a discoverable, autocomplete-friendly interface that reduces friction.

Commands

Command	Description	Existing Tool
/scheduler-list	List all scheduled jobs	list_jobs
/scheduler-get	Get details of a specific job by name	get_job
/scheduler-logs	View execution logs for a job	job_logs
/scheduler-delete	Delete a job (with confirmation)	delete_job

How It Works

• Commands are registered via the plugin's config hook, which injects command templates into Config.command at plugin load time.
• Each command is a prompt template containing $ARGUMENTS placeholder — OpenCode replaces this with user input and sends it to the LLM, which then calls the corresponding existing tool.
• No changes to existing tool implementations. Commands are a UI layer on top of existing functionality.

Scope (V1)

This is intentionally scoped to read-only + delete operations only. Commands like schedule, run, update, and cleanup are deferred to a future version.

Backward Compatibility

• No breaking changes. Existing natural language prompts and direct tool calls continue to work exactly as before.
• The config hook preserves any pre-existing commands via object spread.

Testing

• 9 tests, 29 assertions using vitest
• Coverage: command keys, template content, descriptions, safety confirmation (delete), $ARGUMENTS placeholders, config mutation, existing command preservation

Files Changed

File	Change
src/commands.ts	New — 4 command templates + applySchedulerCommands()
src/commands.test.ts	New — 9 tests with vitest
src/index.ts	Modified — Added import (line 21) + 3 lines in config hook (line 2540-2542)
README.md	Modified — Added slash commands documentation section
package.json	Modified — Added vitest devDependency + test script

[tsaiggo]

Ref #8

[tsaiggo]

Hi @benjaminshafii, can you review this PR and leave any comments, thanks