chore(qsl): align canonical research metadata

[Pigbibi]

Part of the QuantStrategyLab P0-P5 hardening and convergence wave.

Highlights:

• tighten governance / QSL metadata / runtime reporting where applicable
• keep changes minimal and repository-scoped

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[chatgpt-codex-connector]

Keep QSL tier aligned with the research role

This repo is still documented and guarded as a research-only evidence repo (README.md says the QSL layer is research, and AGENTS.md calls it research-only), so changing only the machine-readable QSL metadata to tier = "pipeline" makes any inventory or governance tooling that reads qsl.toml classify it differently from the repository's stated role. If the repo has not actually been reclassified, this should remain research; otherwise the role docs and guardrails need to be updated in the same change.

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