Coach claims "you haven't done any rides recently" when the record holds rides (PMC=0 conflated with no-activity)

[bepcyc]

Found during the manual onboarding run on merged main cc3882c3a (epic #121 completion).

Repro (self-host, SQLite): upload 10 forged rides → all import done (#115 ✅), activities present in GET /v1/activities (has_power/has_cadence/has_gps all true). Set FTP via PUT /v1/athlete/signature {ftp_w:250} + current_sport=cycling. Then ask the coach.

Two findings:

1. Per-ride tss/intensity_factor/normalized_power_w stay null and PMC fitness/fatigue/form stay 0.0 even with FTP set and current_sport=cycling, both when FTP is set after AND before ingest (forge_ride power present, has_power=true). The New self-hoster sees an all-zero fitness chart: FTP prerequisite is never surfaced #116 tester reported TSS≈21 populating after FTP — here it does not in the self-host flow. Root unclear (recompute trigger? power-stream not surfaced to NP? test vs runtime difference) — needs triage. NOT one of the merged Import job status is stuck at "queued" forever — done/failed never reached #115–120 fixes; surfaced by the end-to-end run.
2. The coach states a false qualitative claim: asked "how many rides recently and how is my form?", it answered "You haven't done any rides recently — your fitness, fatigue, and freshness are all at zero" while the record holds 10 rides. grounding.grounded=true because the cited NUMBERS (fitness/fatigue/freshness=0.0) are real — but the prose "you haven't done any rides" is NOT grounded in the record (which has rides) and contradicts it. This is exactly the false-confidence the honesty promise targets: the grounder verifies numeric citations but not the qualitative causal claim derived from PMC=0. A second prompt ("exactly how many rides?") correctly admitted it has no count tool — but still implied "no accumulated work the past couple of weeks."

Expected: the coach must not assert "no rides" from PMC=0; it should distinguish "zero computed training load (e.g. FTP not set → no TSS)" from "no activities," consistent with #116's intent (surface the FTP prerequisite rather than present a confusing/ misleading zero). Likely a VOICE/GROUND guard: a PMC=0 with activities present must not be phrased as absence of activity.

Severity: medium (honesty-premise regression at the coach layer).