Add data model doc and sheets explorer tool

docs/directory.md

@@ -4,11 +4,11 @@ The directory ("Helios Who?") is the community's who's-who: students, parents, a
 
 ## Entities
 
-- **Person** — first and last name; role (student, parent, staff); optional pronouns; optional nickname and pronunciation; photo (some people use an illustrated avatar instead); email; role-specific fields:
+- **Person** — first and last name; role (student, parent, staff); optional pronouns; optional nickname and pronunciation (an audio recording); photo (some people use an illustrated avatar instead); email; role-specific fields:
   - *Students*: grade, classroom and team assignment (displayed as a chain, e.g. grade ▶ team ▶ subteam), optional free-text "about me" written by or about the kid.
   - *Parents*: their kids (shown as context wherever the parent appears), optional room-parent assignments.
   - *Staff*: job title, displayed prominently; staff may have no family record.
-- **Family** — the join between adults and kids: combined surname(s), family photo with a caption identifying everyone in it, member list split into adults and kids, address, phone. Lists show the city; the full address powers map actions.
+- **Family** — the join between adults and kids: combined surname(s), family photo with a caption identifying everyone in it, an optional family-name pronunciation recording, member list split into adults and kids, address, phone. Lists show the city; the full address powers map actions. Families choose how much address to share (full postal address or just the city).
 - **Classroom** — name and mascot artwork, the grade band it serves, and its students, staff, and parents. Classrooms nest teams/subteams that student rows reference.
 - **Grade** — K through 8, grouped into bands (K, 1st/2nd, 3rd/4th, ...) for browsing.