[Darkjay123]

Fills the "Approach TBD" gap on the Private Read use case from issue #138.

What this adds

New approach card Private Read (approaches/approach-private-read.md) comparing three sub-approaches:

• Institution-run nodes (production, I2I+I2U) — reads resolve locally; no third party sees the query path.
• TEE-hosted private RPC (documented, I2I+I2U) — queries encrypted to an attested enclave; the provider sees counters, not content.
• Obfuscated aggregate reads (concept, I2I+I2U) — batching, timing randomization and PIR-style retrieval make individual reads unattributable.

Each sub-approach carries CROPS scores with written justification; the card follows the v2 template (issue #151) with the 10-row comparison matrix, persona perspectives, a conditional recommendation and open questions.

Accompanying changes

• use-cases/private-read.md: the "Approach TBD" recommended-approaches section now links the card.
• CHANGELOG.md: [Unreleased] entry in the style of the recent approach PRs.

Checks

All six required v2 sections present, title prefix and frontmatter complete, body word count within the documented approach limit. The Vale prose gate runs in CI.

Part of #138.