Add user-defined automation jobs

[ScriptedAlchemy]

Summary

• add persisted user-defined automation jobs with cron schedules, attached skills, gated pre-run commands, file/webhook delivery, ledger records, and artifacts
• wire user jobs into scheduler daemon work detection and per-job locking
• add dashboard CRUD/run endpoints and focused runner/dashboard tests

Verification

• TMPDIR=$HOME/.cache/tracedecay-tmp CARGO_TARGET_DIR=$HOME/.cache/tracedecay-target-hermes-r9 cargo check
• TMPDIR=$HOME/.cache/tracedecay-tmp CARGO_TARGET_DIR=$HOME/.cache/tracedecay-target-hermes-r9 cargo test --test automation_runner_test jobs -- --nocapture
• TMPDIR=$HOME/.cache/tracedecay-tmp CARGO_TARGET_DIR=$HOME/.cache/tracedecay-target-hermes-r9 cargo test --test automation_runner_test scheduler -- --nocapture
• TMPDIR=$HOME/.cache/tracedecay-tmp CARGO_TARGET_DIR=$HOME/.cache/tracedecay-target-hermes-r9 cargo test --test dashboard_api_test automation_jobs -- --nocapture

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Latest commit: 2f4eaec

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