Wire Mastra populate through self-healing

[giaphutran12]

Summary

• route protected POST /populate through the self-healing populate runner instead of the old pre-clear Mastra workflow
• add a durable default recipe author, filesystem-backed runner default, and Convex row writer
• replace dataset rows with one internal Convex mutation after validation passes, so rejected candidates do not clear app data
• persist Docker dev recipe manifests on a named volume via POPULATE_RECIPE_STORE_DIR
• move the Mastra benchmark adapter onto the self-healing service with an isolated in-memory recipe store per prompt
• fail fast on missing Convex/OpenRouter/TinyFish runtime keys before spending populate agent work

Verification

• npm --prefix backend test: 30/30 pass
• npm --prefix backend run build: pass
• node --check benchmarks/dataset-agent/adapters/mastra-populate-adapter.mjs: pass
• benchmark mcp-docs-pages without keys: blocked cleanly with missing OPENROUTER_API_KEY + TINYFISH_API_KEY
• bun run build in frontend: blocked on existing missing frontend/convex/_generated/api; convex codegen also blocked because CONVEX_DEPLOYMENT is not configured in this shell

Reviewer fixes

• added one-call Convex replaceByDataset mutation instead of clear then insert calls
• added fail-fast admin/OpenRouter/TinyFish key preflight before expensive self-healing/runtime work
• made Docker recipe state durable with populate_recipe_data volume and explicit store dir

Notes

• stacked on Add Mastra populate self-healing runtime #33
• no auto-merge
• real row-producing benchmark canary still needs runtime keys loaded in the execution environment

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