Add self-healing populate cron runner

[giaphutran12]

Summary

• add an operator/cron CLI for running one self-healing populate tick from dataset context JSON
• default CLI mode is dry-run: isolated in-memory recipe store, no writer, no durable recipe mutations, no Convex admin key required
• --commit mode uses the durable recipe store + atomic Convex row writer, with runtime key preflight before agent work
• reject --recipe-store-dir unless --commit so dry-run cannot accidentally mutate recipe history
• guard atomic replaceByDataset against stale/deleted dataset ids
• update backend handoff docs for current self-healing /populate and CLI behavior

Verification

• npm --prefix backend test: 37/37 pass
• npm --prefix backend run build: pass
• node --check benchmarks/dataset-agent/adapters/mastra-populate-adapter.mjs: pass
• npm --silent --prefix backend run populate:self-heal -- --stdin: emits one JSON missing OpenRouter/TinyFish summary and exits 1
• npm --silent --prefix backend run populate:self-heal -- --stdin --recipe-store-dir .bigset/test-recipes: fails before stdin/context read with one JSON summary and exits 1

Review

• critic rejected first plan because dry-run would persist recipe state; fixed by forcing in-memory store for dry-run and durable store only in --commit
• code reviewer found late recipe-store validation; fixed by moving validation into arg parsing before env/context I/O
• direct frontend Convex typecheck remains blocked by missing generated convex files in this worktree; dataset existence guard is code-inspected

Notes

• stacked on Wire Mastra populate through self-healing #34
• no auto-merge

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