security: reject shared-writable cloud review authority

[seonghobae]

Purpose

Fail cloud-review decision authority closed when its Unix storage directory is writable by group or other principals. Read-only decision files are not durable authorization evidence if another principal can unlink or replace entries through the parent directory.

Test-first state

Current RED head 7b4d7c1b254117437c62df0847efe8a046a7f02d adds a Unix integration regression through the public load_latest_decisions boundary. It makes an existing review directory mode 0777 and requires stable refusal cloud-review-directory-writable-by-others.

No production behavior is changed yet. The exact-head Test workflow must demonstrate the expected RED before the narrow fix is applied.

Scope

This lane owns only cloud-review directory authority and its focused regression. It does not modify the active global coverage owner #156, provider-global-sync #177, generic-cleanup #174, Podman desktop #150, or canonical documentation #149.

Keep Draft until RED is observed, the narrow production fix turns the same regression GREEN, all exact-head required checks pass, and live-base/writer evidence remains clean.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7af1e687-76f9-41db-b109-40299f94819d

📥 Commits

Reviewing files that changed from the base of the PR and between 0ecb8c2 and 99dad9a.

📒 Files selected for processing (2)

• src-tauri/src/cloud_review.rs
• src-tauri/tests/cloud_review_directory_authority.rs

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