|| 0 conflates absent with zero in telegram goal progress and meatspace training stats

[atomantic]

Severity: MEDIUM · Category: Bugs · Complexity: Simple

Per the sentinel-vs-empty convention, || eats valid falsy values:

• server/services/telegram.js:534,599 — targetGoal.progress || 0 can't distinguish "untracked (null)" from "at 0%". Use ?? 0.
• server/services/meatspacePostTraining.js:39-41 — questionCount/correctCount/totalMs || 0 same issue for legitimately-zero sessions. Use ?? 0.

Sweep both files for sibling occurrences of the same pattern while there.

Filed by /do:better audit (2026-06-11).