docs: update CLAUDE.md to current architecture (Phase 8)

Corrects the now-false sections after Phases 2-7: the executor package overview
(ContainerRunner for claude/gemini, LocalRunner, MCP Registry, budget, events —
the subprocess ClaudeRunner/GeminiRunner stub are gone); the execution model and
agent MCP/tool-use back-channel (replacing the /tmp git-sandbox and the removed
claude.go "known bugs"); the planning preamble (MCP tools, not file/REST
conventions); the storage schema (events table, tokens, agent column); task
creation now chatbot/MCP-driven (elaborate endpoint + create form removed); and
new Budget and Auth/binding sections. The REST table gains events/budget/MCP
routes.

Design Debt now lists the remaining Phase 8 follow-ups: the stories/checker
backend teardown, dropping deprecated task columns, and the unverified gemini
tool-use spike.

https://claude.ai/code/session_01SESwn7kQ7oP62trWw6pc39

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