chore: scrub remaining Teller / financial / DuckDB references

CHANGELOG.md

@@ -18,4 +18,4 @@ Released versions are drafted automatically by [release-drafter](https://github.
 
 ### Notes
 
-- This template was extracted from a financial-agent take-home (Teller) and generalised. The harness is the product; the scaffold exists so every gate has something to operate on.
+- This template was extracted from a prior LLM-coded project and generalised. The harness is the product; the scaffold exists so every gate has something to operate on.

docs/ARCHITECTURE.md

@@ -57,7 +57,7 @@ The template's runtime architecture is intentionally small — one backend servi
 | `src/api/sessions.py` | In-memory dict | Redis or DB-backed store |
 | `eval/golden_qa.json` | One echo case | 15-50 cases by category |
 
-The layered import-linter contract lets each slot grow without coordination — adding `src/data/duckdb_client.py` doesn't trigger any change in `src/models/` or `src/api/`.
+The layered import-linter contract lets each slot grow without coordination — adding `src/data/db_client.py` doesn't trigger any change in `src/models/` or `src/api/`.
 
 ## Request lifecycle (scaffold)
 

docs/TASKS.md

@@ -60,7 +60,7 @@ Source of truth for the harness extraction. Cross-referenced with the [issues](h
 | # | Title | Size | Priority | Depends | Status |
 |---|---|---|---|---|---|
 | 21 | `feat: frontend scaffold (Vite + React 19.2 + TS strict, eslint flat + prettier + vitest)` | M | Critical | #1 | ✅ |
-| 22 | `feat: typed SSE client primitive (port from Teller, .ts)` | S | High | #21 | ✅ |
+| 22 | `feat: typed SSE client primitive (typed POST + ReadableStream)` | S | High | #21 | ✅ |
 | 23 | `feat: hello page hitting /api/v1/health + CSS-variable palette + sample component test` | S | Medium | #21, #22 | ✅ |
 
 ### Phase 6 — Eval scaffolding