agent: delete unused Python stubs (main.py, executor.py, memory.py, tools/{browser,search,writer}.py) — nothing imports them

[jravinder]

Problem

Six Python files in agent/ are skeleton stubs that no other file imports. They predate the TypeScript pivot and now mislead readers, fail ruff check exemptions, and waste reviewer time when grep'ing the agent surface.

Verified unreferenced (no import sites in agent/, mcp/, or tests/):

File	Lines	Status
agent/main.py	201	All TODO comments — class TXLookup body is print(...)
agent/executor.py	157	Stub
agent/memory.py	48	Stub with TODO: swap to Supabase
agent/tools/browser.py	52	4x # TODO: Codex — implement
agent/tools/search.py	26	2x # TODO: Codex — implement
agent/tools/writer.py	23	1x # TODO: Codex — implement
mcp/tools.py	(small)	# TODO: Codex — implement shared utilities

The live runtime uses app/lib/agent.ts for orchestration, app/lib/specialists.ts for delegation, and app/api/agent/route.ts for SSE. The Python mcp/server.py only depends on agent/planner.py, agent/tools/data.py, agent/tools/miro.py.

Fix

1. git rm the six unreferenced files above
2. Update AGENTS.md directory-structure block (paired with the docs-drift issue) to drop them
3. Confirm ruff check agent/ mcp/ still passes
4. Confirm pytest tests/ still passes (none of the deleted files have associated tests)

If any of these are wanted as future placeholders, leave a single agent/README.md that says "browser/search/writer tools are unimplemented — see app/lib/agent.ts for the live runtime."

Code pointers

• agent/main.py, agent/executor.py, agent/memory.py
• agent/tools/browser.py, agent/tools/search.py, agent/tools/writer.py
• mcp/tools.py
• Verification: grep -rn 'from agent.main\|from agent.executor\|from agent.memory\|from agent.tools.browser\|from agent.tools.search\|from agent.tools.writer' . returns nothing

Acceptance

• Six files removed
• CI still green (lint-python, lint-typescript, catalog-parity)
• mcp/server.py boots
• tests/test_mcp_boot.py still passes