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/personal/subagents.md

@@ -1,6 +1,6 @@
 # Personal Subagents
 
-The personal lead agents (Shawn, Nate, Hypatia, Marcus, Watson, Bourdain, David, Cousteau, Garth, Cristiano) delegate certain repeatable tasks to a shared **subagent** — minimal personality, narrow scope, called as a tool. Subagents don't own graph nodes and don't have character bibles.
+The personal lead agents (Shawn, Nate, Hypatia, Marcus, Watson, Sophia, David, Garth, Cristiano) delegate certain repeatable tasks to a shared **subagent** — minimal personality, narrow scope, called as a tool. Subagents don't own graph nodes and don't have character bibles.
 
 Subagents are runtime processes defined under `iolaus/agents/` (personal-team variants) or `kottos/agents/` (engineering originals, reused), exposed as MCP tools via StreamableHTTP. The canonical prompt text lives in `prompts/personal/subagents/` — copies in the runtime code should match.
 
@@ -14,7 +14,7 @@ Mikael has a stronger editorial voice than the other subagents (Scandinavian new
 
 **Composition:** `fast.parallel` of three sub-agents:
 - `web_search` — argos
-- `memory_lookup` — neo4j (read-only), scoped to the **full personal-domain schema** (10 agents, all node types)
+- `memory_lookup` — neo4j (read-only), scoped to the **full personal-domain schema** (9 agents, all node types)
 - `synthesizer` — merges the two reports, flags conflicts, suggests memory updates
 
 **Tools:** argos, neo4j_cypher