merge: integrate oss branch — budget gating, MCP back-channel, events, loopback-only bind

Key features from OSS branch:
- Budget gating: rolling per-provider spend caps with BUDGET_EXCEEDED task state
- Agent MCP back-channel: runners mint tokens; /mcp endpoint resolves them
- Chatbot MCP server at /chatbot/mcp (requires api_token in config)
- Event timeline: unified event stream replacing ad-hoc question/summary flows
- Loopback-only default bind (127.0.0.1:8484); external_bind_allowed=true to expose
- repository_url required on task creation (enforces traceability)
- Auto-checker: spawns verification task after each execution

Conflict resolutions:
- serve.go: keep cfg.Runners.XEnabled() conditional registration from main + agentRegistry from oss
- config.go: keep RunnersConfig from main + BudgetConfig/ExternalBindAllowed from oss
- server.go: handleStaticFiles (base-path rewrite) kept; deduplicated duplicate from both sides
- executor/claude.go: accepted oss deletion (ClaudeRunner replaced by ContainerRunner)
- container_test.go: added noopChannel + AgentChannel parameter to Run call

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 0 insertions, 24 deletions

diff --git a/web/test/new-task-button.test.mjs b/web/test/new-task-button.test.mjs
deleted file mode 100644
index 45a3548..0000000
--- a/web/test/new-task-button.test.mjs
+++ /dev/null
@@ -1,24 +0,0 @@
-// new-task-button.test.mjs — visibility contract for the New Task button
-//
-// The New Task button lives in the global header and must be visible on all tabs.
-// Run with: node --test web/test/new-task-button.test.mjs
-
-import { describe, it } from 'node:test';
-import assert from 'node:assert/strict';
-import { newTaskButtonShouldShowOnTab } from '../app.js';
-
-const ALL_TABS = ['tasks', 'active', 'running', 'stats'];
-
-describe('new task button visibility', () => {
-  for (const tab of ALL_TABS) {
-    it(`is visible on "${tab}" tab`, () => {
-      assert.equal(newTaskButtonShouldShowOnTab(tab), true, `expected button to be visible on tab "${tab}"`);
-    });
-  }
-
-  it('is visible on any unknown future tab', () => {
-    assert.equal(newTaskButtonShouldShowOnTab('help'), true);
-    assert.equal(newTaskButtonShouldShowOnTab('templates'), true);
-    assert.equal(newTaskButtonShouldShowOnTab(''), true);
-  });
-});