v1.2.0:6 — AI "generate today's workout" from a brain-dump

Add a single-session AI flow alongside program generation: describe a
workout in plain words and get a ready-to-log workout back — exercises
with suggested weights, target reps, and set counts grounded in the
user's recent history. The suggestion can be inline-edited or refined
by sending a follow-up instruction back to the model, then "Use this
workout" pre-fills the normal New Workout form (nothing persists until
the user saves through the regular path).

Why reuse, not fork: the existing program-generation spine (detached
background runner, SSE streaming, lenient-JSON preview, 5 providers,
history context, library name->id mapping) already does the hard parts.
A new AIGeneration.kind discriminant ("program" | "workout", default
"program" via boot-time guarded ALTER) selects the parser and keeps the
ephemeral workout rows out of the program-shaped AI history. Refine is a
fresh generation seeded with the prior suggestion (validated through the
same schema before it re-enters the prompt).

Hand-off is sessionStorage -> /main/workouts/new?from=ai -> AiWorkoutPrefill,
which expands each suggestion into N sets and maps effort by cardio-ness
(Gear for cardio, RPE for strength). EditWorkoutData.id is now optional so
the prefill CREATEs rather than PATCHing a nonexistent id. The AI suggests
each weight in that exercise's effective logging unit (the library JSON
carries a per-exercise unit) so the stored number and unit never diverge.

Built + sideloaded to immense-voyage.local as 1.2.0:6; on-box ALTER and
non-root launch confirmed via start-cli. tsc clean (app + packaging),
251 tests pass, next build + s9pk build succeed.

start9/0.4/docker_entrypoint.sh

@@ -221,6 +221,13 @@ if command -v sqlite3 >/dev/null 2>&1 && [ -f "$DB_PATH" ]; then
     sqlite3 "$DB_PATH" "ALTER TABLE AIGeneration ADD COLUMN durationMs INTEGER;"
   fi
 
+  # v1.2.0:6: single-workout generation. `kind` discriminates program vs
+  # workout rows; defaults to "program" so existing rows read correctly.
+  if ! sqlite3 "$DB_PATH" "PRAGMA table_info('AIGeneration');" 2>/dev/null | grep -q "|kind|"; then
+    log "adding AIGeneration.kind (default 'program')"
+    sqlite3 "$DB_PATH" "ALTER TABLE AIGeneration ADD COLUMN kind TEXT NOT NULL DEFAULT 'program';"
+  fi
+
   if ! sqlite3 "$DB_PATH" "PRAGMA table_info('ProgramExercise');" 2>/dev/null | grep -q "|suggestedWeight|"; then
     log "adding ProgramExercise.suggestedWeight + suggestedWeightUnit"
     sqlite3 "$DB_PATH" "ALTER TABLE ProgramExercise ADD COLUMN suggestedWeight REAL;"