docs: reflect data-model refactor in CLAUDE.md + DB schema overview

PR 15 (docs): the numbered spec files mostly described the new model
already at the conceptual level, but two needed concrete updates:

- 07-DATABASE-SCHEMA.md: schema overview now lists the new Yacht /
  Company / Reservation domains alongside the existing ones, names the
  partial unique indexes (idx_yoh_active, idx_br_active) that enforce
  exclusivity, and notes that yacht/company details are no longer
  stored on `clients`.
- CLAUDE.md: the Conventions section now points future contributors at
  the new schema files, the polymorphic ownership pattern, the
  EoiContext/dual-path EOI flow, and the merge-token allow-list. Adds
  a pointer to the husky `.env*` block so it doesn't trip people up.
  References the new field-mapping doc and `assets/README.md`.

Task 15.3 (Tier 4 golden-image PDF regression) is deferred — those
tests need committed reference PDFs that come out of a real, manually
verified EOI render. Best landed once the actual `assets/eoi-template.pdf`
is in place; tracking as a follow-up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

07-DATABASE-SCHEMA.md

@@ -20,16 +20,42 @@
 
 ### Client Domain
 
-- `clients` — Anchor records for people/entities
+- `clients` — Anchor records for people/entities. Yacht and company details
+  are no longer stored here — see the Yacht and Company domains.
 - `client_contacts` — Multi-channel contact entries per client
+- `client_addresses` — Physical addresses per client (primary + others)
 - `client_relationships` — Relationships between clients (referrals, broker, family)
 - `client_notes` — Timestamped notes on clients
 - `client_tags` — Tags assigned to clients
 - `client_merge_log` — Audit trail of client merges
 
+### Yacht Domain
+
+- `yachts` — First-class yacht records. Polymorphic ownership via
+  `current_owner_type` (`'client' | 'company'`) + `current_owner_id`.
+- `yacht_ownership_history` — Append-only log of every transfer; partial
+  unique index `idx_yoh_active` enforces a single active owner per yacht.
+- `yacht_notes`, `yacht_tags` — Notes / tags on yachts.
+
+### Company Domain
+
+- `companies` — Legal entities that may own yachts or be billed.
+- `company_addresses` — Addresses per company.
+- `company_memberships` — Active client ↔ company links with role
+  (director / shareholder / beneficial_owner / authorised_signatory),
+  start/end dates.
+
+### Reservation Domain
+
+- `berth_reservations` — Concrete client + yacht + berth holds with
+  start/end dates and status. Partial unique index `idx_br_active`
+  enforces one active reservation per berth.
+
 ### Interest Domain
 
-- `interests` — Per-berth pipeline records, each belonging to a client (milestone dates are inline columns)
+- `interests` — Per-berth pipeline records. Each row references a
+  `client_id`, `yacht_id` (the yacht in scope for the inquiry), and
+  optional `berth_id`. Milestone dates are inline columns.
 - `interest_notes` — Timestamped notes on interests
 - `interest_tags` — Tags assigned to interests