Load self-healing cron context by dataset id

[giaphutran12]

Summary

• add --dataset-id to the self-healing populate CLI so cron/operator jobs can load live dataset context instead of relying on pasted JSON
• add internal Convex query datasets.getForSystemPopulate for system-level populate context loading
• add backend ConvexPopulateDatasetContextLoader with lazy import so old --context/--stdin dry-runs still do not require Convex env
• tighten CLI parser to reject mixed context sources in any order
• keep dry-run isolated in-memory; --dataset-id --commit uses durable store + writer after context load

Verification

• npm --prefix backend test: 47/47 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 -- --dataset-id dataset-ai-posts: emits one JSON missing Convex/OpenRouter/TinyFish keys and exits 1
• npm --silent --prefix backend run populate:self-heal -- --stdin: emits one JSON missing OpenRouter/TinyFish only and exits 1
• npm --silent --prefix backend run populate:self-heal -- --stdin --context context.json: rejects mixed context sources before context read

Review Notes

• critic rejected the first plan until dataset-id mode had exact-one source parsing and mode-aware Convex preflight; covered with tests
• code reviewer flagged live Convex verification gap: make convex-push is currently blocked locally because Docker daemon is not running and ignored env files are absent in this worktree/main checkout
• direct frontend Convex diagnostics remain noisy because frontend/convex/_generated is missing; backend tests cover loader call shape and CLI behavior

Notes

• stacked on Add self-healing populate cron runner #35
• no auto-merge

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