chore: commit remaining pre-existing changes

- Agent configs (.opencode/agents/)
- Backend: alembic, routes, app, utils, scripts
- Frontend: package.json, vite, components, e2e infra
- Specs: 028-llm-datasource-supeset updates
- Docker e2e config and Playwright setup

.opencode/agents/closure-gate.md

@@ -1,7 +1,7 @@
 ---
 description: Closure gate subagent that re-audits merged worker state, rejects noisy intermediate artifacts, and emits the only concise user-facing closure summary for ss-tools.
 mode: subagent
-model: opencode/deepseek-v4-flash-free
+model: opencode-go/deepseek-v4-flash
 temperature: 0.0
 permission:
   edit: allow

.opencode/agents/fullstack-coder.md

@@ -1,7 +1,7 @@
 ---
 description: Fullstack Implementation Specialist for ss-tools — owns Python backend + Svelte frontend integration, cross-cutting features, and end-to-end verification.
 mode: all
-model: opencode/deepseek-v4-flash-free
+model: opencode-go/deepseek-v4-flash
 temperature: 0.2
 permission:
   edit: allow

.opencode/agents/qa-tester.md

@@ -1,7 +1,7 @@
 ---
 description: QA & Semantic Auditor — orthogonal verification, contract validation, code review, and regression defense for Python (pytest) and Svelte (vitest).
 mode: all
-model: opencode-go/qwen3.6-plus
+model: opencode-go/deepseek-v4-flash
 temperature: 0.1
 permission:
   edit: allow

.opencode/agents/reflection-agent.md

@@ -1,7 +1,7 @@
 ---
 description: Senior reflection and unblocker agent for tasks where a coder entered anti-loop escalation in ss-tools; analyzes architecture, environment, dependency, contract, and test harness failures across Python and Svelte stacks.
 mode: subagent
-model: opencode/big-pickle
+model: opencode-go/deepseek-v4-flash
 temperature: 0.0
 permission:
   edit: allow

.opencode/agents/semantic-curator.md

@@ -1,7 +1,7 @@
 ---
 description: Semantic Curator Agent — maintains GRACE semantic markup, anchors, and index health for ss-tools Python and Svelte code. Read-only file access; uses axiom MCP for mutations.
 mode: all
-model: opencode/deepseek-v4-flash-free
+model: opencode-go/deepseek-v4-flash
 temperature: 0.4
 permission:
   edit: allow

.opencode/agents/speckit.md

@@ -1,7 +1,7 @@
 ---
 description: Speckit Workflow Specialist — runs the full feature lifecycle from specification through planning, task decomposition, and implementation for Python/Svelte ss-tools features.
 mode: all
-model: opencode/deepseek-v4-flash-free
+model: opencode-go/deepseek-v4-flash
 temperature: 0.2
 permission:
   edit: allow

.opencode/agents/svelte-coder.md

@@ -1,7 +1,7 @@
 ---
 description: Svelte Frontend Implementation Specialist for ss-tools — implements Svelte 5 (Runes) UI with Tailwind CSS, browser-driven validation, and UX state machines.
 mode: all
-model: opencode/deepseek-v4-flash-free
+model: opencode-go/deepseek-v4-flash
 temperature: 0.1
 permission:
   edit: allow

.opencode/agents/swarm-master.md

@@ -1,7 +1,7 @@
 ---
 description: Strict subagent-only dispatcher for semantic and testing workflows; never performs the task itself and only delegates to worker subagents (python-coder, svelte-coder, fullstack-coder, qa-tester, reflection-agent, closure-gate).
 mode: all
-model: opencode/big-pickle
+model: opencode-go/deepseek-v4-flash
 temperature: 0.0
 permission:
   edit: deny