Document collection runtime migration plan

[giaphutran12]

Summary

• documents the reviewed migration path for bringing the collection pipeline into the self-healing populate stack
• separates current proven self-healing behavior from unproven collection/Playwright/live canary work
• adds acceptance gates for recipe-instruction propagation, runtime selection through HTTP + CLI, self-healing-wrapped benchmarks, and Convex boundary preservation

Verification

• make verify-self-healing passed: backend tests 47/47, backend build, adapter syntax, no-key benchmark smoke blocked with zero spend
• second-agent plan review initially rejected the first draft; patched plan was re-reviewed and passed
• public PR hygiene checked with git diff --name-status main...HEAD; this PR adds only docs/data-collection-agent-migration-plan.md on top of PR Add self-healing stack verifier #37

Notes

• No auto-merge.
• This is intentionally a coordination PR so implementation can proceed on fresh branches without touching main or the candidate collection branch directly.

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