feat(personal): Sophia replaces Bourdain and Cousteau

Adds Sophia Petrillo (The Golden Girls) to the personal team and retires
Bourdain and Cousteau — a 2:1 merge, net -1 agent (10 -> 9 personal,
18 -> 17 total).

Why: the personal team casts fictional characters. Bourdain and Cousteau
are real people, one with significant baggage and one who died by suicide,
and neither had a dedicated MCP server or capability. Sophia is fictional,
plausibly owns both domains (an Italian grandmother knows food; tending
plants and the tank is housekeeping), and is the first personal agent to
actuate the house via the new Hecate MCP server.

Graph: Sophia inherits all 11 node types unchanged (Recipe, Restaurant,
Ingredient, Meal, Technique + Species, Plant, Tank, Garden, Ecosystem,
Observation). Uniqueness constraints are keyed on node label, not agent,
so there is no schema or data migration. Historical Note tags
(from:bourdain, to:cousteau) are deliberately left intact as an accurate
record. Schema bumped to 2.5.0.

Also:
- New docs/tools/hecate.md + prompts/tools/hecate.md, documenting the
  physical-actuation discipline (never guess a room or device slug) and
  stating plainly what Hecate cannot do yet: no sensor readings (Demeter
  is REST-only), no weather, and set_timer is routine-bound with no
  cancel — the conversational timer is coming to Daedalus.
- Shawn gains Periplus in the docs. The server was already wired in
  iolaus but never described in any prompt, so the model was handed a
  tool it was never told about — including the never-estimate-coordinates
  rule.
- Corrected stale counts (15/16/18 assistants -> 17) and the stale
  "Bowie's Domain" schema heading missed when David replaced Bowie.
- Removed utils/neo4j-schema-init.py.bak, a pre-Watson artifact.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -36,9 +36,8 @@ The lists below reflect what's currently in `prompts/{team}/` — the source of
 | **Hypatia** | Hypatia of Alexandria | Learning & Reading |
 | **Marcus** | Marcus Aurelius | Fitness & Training |
 | **Watson** | — | Relationship memory & emotional safety (replaces Seneca) |
-| **Bourdain** | Anthony Bourdain | Food & Cooking |
+| **Sophia** | Sophia Petrillo | Home, Food & Living Things (replaces Bourdain and Cousteau) |
 | **David** | — | Arts & Culture (replaces Bowie) |
-| **Cousteau** | Jacques Cousteau | Nature & Living Things |
 | **Garth** | Garth Turner | Personal Finance |
 | **Cristiano** | Cristiano Ronaldo | Football |
 
@@ -80,6 +79,7 @@ koios/
 │       ├── context7.md               #     Library docs
 │       ├── time.md                   #     Current date/time
 │       ├── rommie.md                 #     Desktop automation
+│       ├── hecate.md                 #     Home automation
 │       └── neo4j.md                  #     Graph usage discipline
 ├── docs/                             # Human reference + LLM context for graph/messaging
 │   ├── personal/                     #   Character definitions & team overview
@@ -95,6 +95,7 @@ koios/
 │       ├── context7.md
 │       ├── time.md
 │       ├── rommie.md
+│       ├── hecate.md
 │       └── neo4j/                    #   Neo4j has extensive content; its own subdir
 │           ├── unified-schema.md     #     Canonical graph schema
 │           ├── shared.md             #     MCP registry, Agathos sandbox, messaging protocol, assistant directory (LLM-facing)