feat(tier0): Deterministically break pinnedness ties by QNode ID suffix (prefer earlier IDs)

[everaldorodrigo]

Objective

Adjust tie-breaking when multiple nodes share the same pinnedness score.

Ensures more predictable start-node selection when pinnedness scores are equal, aligning tie-breaking with normalized-style node IDs that end in an index-like suffix.

Notes

This only affects cases where pinnedness scores are tied; primary selection by pinnedness is unchanged.

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
...c/retriever/data_tiers/tier_0/dgraph/transpiler.py	78.74% <100.00%> (ø)

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