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]

Restore the research tier metadata

The repository’s QSL architecture section still classifies this repo as research and documents the research-only boundary in README.md:4-10, but the machine-readable QSL metadata now publishes tier = "pipeline". Any QSL inventory/governance automation that reads qsl.toml will classify this repo differently from the documented boundary, so this research-only artifact producer can be grouped with pipeline consumers unless the tier remains research or the architecture docs are updated in the same change.

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