Add codemode: typechecked TypeScript execution with tools

[jonastemplestein]

Summary

Adds codemode execution to the agent: the LLM can write TypeScript code blocks that are typechecked and executed, with access to tools for file I/O, shell commands, web fetching, and secrets.

Features

Code Execution

• <codemode>...</codemode> blocks are typechecked with strict TypeScript
• Executed in a Bun subprocess with streamed stdout/stderr
• Type errors trigger agent retry (agent sees errors and can fix)

Available Tools

• t.sendMessage(msg) — show message to USER (no agent turn)
• t.readFile(path) / t.writeFile(path, content) — file I/O
• t.exec(command) — run shell commands
• t.fetch(url) — HTTP requests
• t.getSecret(name) — access secrets (hidden from LLM)

Agent Loop

• console.log() output triggers another agent turn
• t.sendMessage() output goes to user, no turn
• Most tasks complete in one turn
• Max 3 iterations before forced stop

Event Model

• Added triggerAgentTurn property to all events
• LLM triggered by any event with triggerAgentTurn="after-current-turn"
• CodemodeResultEvent persisted with stdout/stderr for conversation history

Files Added

• src/codemode.model.ts — code block parsing, event types
• src/codemode.service.ts — orchestrates parse → typecheck → execute
• src/codemode.repository.ts — stores generated code files
• src/code-executor.service.ts — runs code in Bun subprocess
• src/typechecker.service.ts — TypeScript type checking
• test/codemode.e2e.test.ts — end-to-end tests

All 75 tests pass.

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Note

Adds codemode enabling LLM-emitted TypeScript to be typechecked and executed via Bun with tools, persisting results to drive an agent loop across CLI/UI/HTTP and a new per-context storage layout.

• Codemode (core):
  • Add codemode pipeline: parse <codemode> blocks, typecheck (TS), execute via Bun subprocess, stream events.
  • New services: CodemodeService, TypecheckService, CodeExecutor, CodemodeRepository.
  • New events: CodemodeResultEvent, CodemodeValidationErrorEvent and codemode streaming events; add triggerAgentTurn to events.
  • LLM prompt building updated to include codemode results/validation.
• Context/Agent:
  • ContextService.addEvents supports codemode and emits codemode events; swaps in codemode system prompt when enabled.
  • Agent continuation driven by triggerAgentTurn with persisted CodemodeResult.
• CLI/UI:
  • Add codemode run subcommand; integrate codemode into chat flow with an agent loop (iteration cap) and colored streaming output.
  • TUI updated to render codemode results/validation and ignore ephemeral codemode stream events.
• HTTP/Adapters:
  • SSE streaming and LayerCode adapter generalized to ContextOrCodemodeEvent.
• Persistence:
  • Contexts now stored per-directory with events.yaml; repository APIs updated (getContextDir, listing by directories).
• Tests/Config:
  • Add E2E and unit tests for codemode; vitest config includes src/**/*.test.ts.
  • ESLint ignores .mini-agent/**.

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