Environment: lab, corpus, knowledge base and GPU arms move here from inference-server

[AdvayMonga]

The other half of AdvayMonga/inference-server#100. After both merge, inference-server is the engine and its stack, and this repo is the whole environment. Stacked on #2 (regimes): merge #2 first, or retarget this PR to main.

Moved in, as-is

From inference-server main (ef9ce63) plus its open PRs #97 (mixed corpus classes) and #99 (knowledge entries):

• lab/: session loop, agent, tools, ledger, workspace, budget, sandbox/grader, canaries, profiler, vm.py with the Verda/Nebius/Crusoe providers, vm-setup.sh
• corpus/ with build_corpus.py and fetch_traces.py
• knowledge/, ENVIRONMENT.md, tests/test_lab_*.py
• validity/roofline.py

Rewired for two repos

• lab/engine.py: the engine repo is LAB_ENGINE_REPO (default ../inference-server); its interpreter is LAB_ENGINE_PYTHON, or that repo's .venv/bin/python.
• The grader's lint and tests, both jails, and the agent's shell all run the engine's interpreter.
• profile stages only its harness (__init__, profile, bundle, gpu) into the pristine tree under _harness/. The jail therefore never opens this repo, which holds .env and the ledger.
• lab.vm pushes both trees: the engine to LAB_VM_DIR (its .venv is on PATH) and this repo to LAB_VM_ENV_DIR (default ~/BlameGraph). run --env runs here; setup builds the engine's venv.
• regimes defaults to the local corpus/ and pools every manifest class.
• New: pyproject.toml (optional extras plus pytest/ruff config), tests/conftest.py (finds the engine; tests that drive engine code skip without it), CI (lab pytest + ruff, referee/regime scripts, weekly corpus provenance).
• lab/ledger/ and lab/runs/ are gitignored.

Verified

• Lab suite: 131 passed, 4 skipped without engine deps. The 4 pass (6 tests) with the engine's interpreter.
• All referee and regime script tests pass. ruff check . is clean (this also removed 2 pre-existing unused imports in logs/ so CI lint passes).
• End to end against the inference-server#100 branch: test tool gives PASS (lint, 360 engine tests); profile tool writes a bundle.
• The new CI workflow hasn't run yet; this PR is its first run.

For you

• Move lab/ledger/ from your inference-server checkout into this repo's lab/ledger/ if you want the history.
• Set the lab env vars (LAB_VM_*, provider credentials, ANTHROPIC_API_KEY) here, plus LAB_ENGINE_REPO if the engine isn't at ../inference-server.

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