test(rust): cover acquisition link lifecycle

[LIghtJUNction]

Summary

Follow-up to merged Rust acquisition coverage PR #557.

Add one isolated PostgreSQL regression test for the remaining promotion-link storage lifecycle in PgAcquisitionStore:

• Invalid create inputs do not persist partial rows.
• Updating a link changes only name and archived; attribution fields and creation time remain immutable.
• The test reloads the persisted PostgreSQL row, rather than trusting the pre-update object returned by save_link.
• Status filters distinguish active, archived and soft-deleted records.
• Case-insensitive search escapes SQL LIKE wildcards (_ and %).
• Pagination compares the exact IDs across both pages, detecting repeated or omitted rows.
• Invalid list/delete inputs fail closed.
• A deleted link cannot be deleted again or revived through the update path.

The acquisition PostgreSQL inventory increases from six to seven tests, and the repository real-integration inventory from 97 to 98 ignored tests across ten modules.

The branch is rebased on current main and contains one commit. Both review threads about persisted-state and pagination assertions are addressed and resolved.

No production code, API, schema, frontend or Go changes.

Verification

Local:

• cargo fmt --all --check: passed.
• cargo clippy --locked -p lmm-api-rs --test acquisition -- -D warnings: passed.
• cargo test --locked -p lmm-api-rs --test acquisition -- --skip postgres_: 2 passed.
• cargo test --locked -p lmm-api-rs --test acquisition -- --ignored --list: all 7 PostgreSQL tests compiled and listed.
• python3 tests/scripts/test-new-integration-suites.py: 7 passed.
• bash tests/scripts/check-real-integration-gates.sh: passed; 98 ignored tests across 10 modules.
• bash -n tests/scripts/run-real-integration-gates.sh: passed.
• git diff --check: passed.

GitHub Actions CI run 37083490347: passed.

• Rust formatting, Clippy and tests: passed.
• PostgreSQL 18 and Valkey integration gate: passed.
• postgres_link_updates_filters_searches_and_deletes_are_durable: passed.
• Acquisition PostgreSQL suite: 7 passed, 0 failed.
• RustSec, route/behavior alignment and CI Quality Gate: passed.

Coverage check

Targeted non-PostgreSQL acquisition coverage:

• routes/acquisition.rs: 136/340 lines (40.00%), 15/37 functions (40.54%).
• routes/acquisition/data.rs: 7/221 lines (3.17%), 2/26 functions (7.69%).
• routes/acquisition/store.rs: 3/428 lines (0.70%), 1/43 functions (2.33%).

The local coverage command excludes ignored PostgreSQL tests, so the store percentage does not credit this database test; the successful PostgreSQL 18 gate provides execution evidence for the persisted update and pagination paths.

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[LIghtJUNction]

Two regression-coverage gaps in the new lifecycle test, identified from the assertions and current store implementation: