yoi/work-items/closed/20260531-104614-pure-path-fallback-tests/resolution.md

Made manifest::paths fallback tests independent from process-global environment mutation.

Implementation:

• Added narrow private per-key fallback helpers for config/data/runtime path resolution.
• Public path functions still read the same env vars and pass them in the same precedence order.
• Empty path env values still resolve as unset.
• Fallback-order tests now pass direct Option<PathBuf> inputs instead of using std::env::set_var / remove_var.
• No PathEnv, EnvSnapshot, env trait, test-support crate, or new env var surface was introduced.
• Credential env behavior and Pod runtime/process behavior were not changed.

Review:

• External reviewer pure-path-fallback-reviewer-20260531 approved implementation commit e232f54.

Validation after merge:

• cargo fmt --check
• cargo test -p manifest paths
• cargo test -p manifest
• cargo check -p manifest (passed with unrelated existing llm-worker dead_code warning)
• ./tickets.sh doctor
• git diff --check
• git grep -n -E 'set_var\(|remove_var\(' -- crates/manifest/src/paths.rs || true produced no matches.