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>

docs/engineering/team.md

@@ -1,6 +1,6 @@
 # The Engineering AI Assistant Team
 
-Three AI assistants — one builds, one operates, one handles the physical layer — sharing a unified Neo4j knowledge graph with the Personal and Work teams (eighteen assistants total, one graph). Engineering also has a small set of utility subagents that the leads delegate to — see [subagents.md](subagents.md).
+Three AI assistants — one builds, one operates, one handles the physical layer — sharing a unified Neo4j knowledge graph with the Personal and Work teams (seventeen assistants total, one graph). Engineering also has a small set of utility subagents that the leads delegate to — see [subagents.md](subagents.md).
 
 ## The Agents
 
@@ -103,7 +103,7 @@ The leads delegate certain repetitive or narrow tasks to engineering subagents
 
 Each agent's tool usage is documented in their own doc (Harper: [harper.md](harper.md), Scotty: [scotty.md](scotty.md), CASE: [case.md](case.md)) — the agent doc is the source of truth for which tools that agent uses. The tool catalog (per-tool reference, gotchas) lives at [docs/tools/](../tools/).
 
-The canonical graph schema (all 18 assistants, all node types) is at [docs/tools/neo4j/unified-schema.md](../tools/neo4j/unified-schema.md).
+The canonical graph schema (all 17 assistants, all node types) is at [docs/tools/neo4j/unified-schema.md](../tools/neo4j/unified-schema.md).
 
 ## Cross-Team Touchpoints