inferSubscriptionTier only checked subscription_tier|tier|plan_tier|plan,
but Sase.tr's setPeopleProperties writes subscription_plan. Result: every
authed user showed tier=— in /insights/sessions/* and the tagger's
userValue boost (full=1.0, brand=0.7) collapsed to the 0.5 default.
- Add subscription_plan to the key list (priority first since it matches
Sase.tr's actual property name)
- Extract into shared extractTierFromProps(props) helper
- In tag-sessions, re-evaluate tier from enrichment.userProperties and
backfill when null. Tag step runs ~2min after ingest, by which point
PostHog has the user's post-signup $set props that weren't on the
recording row at ingest time.
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