chore: un-nest package to repo root, archive research artifacts, add MIT LICENSE

[jack-champagne]

Implements §1–2 of the convergence & bundle-pipeline design spec (PR #15,
docs/specs/2026-07-01-jl2py-convergence-and-bundle-pipeline-design.md) — nothing
more. The Python package is un-nested to the repo root, the phased research corpus
is archived, and an MIT LICENSE is added. All moves use git mv, so history is
preserved (the diff shows renames, not delete+add).

Package un-nest (§1)

From	To
out/jl2py/src	src
out/jl2py/csrc	csrc
out/jl2py/tests	tests
out/jl2py/pyproject.toml	pyproject.toml
out/jl2py/setup.py	setup.py
out/jl2py/ci	ci
out/demos	demos

out/ is now empty and removed. (out/jl2py/ had no README/MANIFEST.in — only the
files above.)

Docs reorganization (§2)

Promoted to live docs under docs/:

• part3/jl2py_prd.md → docs/jl2py-prd.md
• part5/jl2py-toolchain-plan.md → docs/jl2py-toolchain-plan.md
• reports/implementation_status.md → docs/implementation-status.md
• (docs/jlpy-data-model.md, docs/jlpy-type-model.md, docs/README.md unchanged/live)

Archived (provenance preserved via part subdirs):

• part1..part5/* (remaining) → docs/archive/research/partN/
• reports/* (remaining) → docs/archive/session-notes/

part1..5/ and reports/ are gone. docs/README.md updated to point at the new
layout and list the promoted specs.

LICENSE

Added standard MIT LICENSE at the repo root, Copyright (c) 2026 Harmoniqs, Inc.
Matches the existing pyproject.toml declaration license = {text = "MIT"} (left
as-is — no contradiction).

Path fixes

• .github/workflows/test.yml: make -C csrc, JL2PY_LIB_PATH under csrc/build,
  pytest tests.
• .github/workflows/wheels.yml: package-dir: . and comment. CIBW_BEFORE_ALL's
  {project}/ci/install_julia.sh stays valid ({project} is the package-dir, now
  root; ci/ is at root). JULIA_INCLUDE_PATH=/opt/julia/... unaffected.
• demos/demo_common.py: JL2PY_SRC now ../src (was ../jl2py/src).
• demos/*.py + tests/*.py docstrings: dropped stale
  scratch/jlpy-interop/out/... run instructions.
• tests/test_kwargs_slice.py + docs/implementation-status.md: code-location
  citations now point at csrc/ and src/.
• Verified no edits needed in setup.py, pyproject.toml, csrc/Makefile,
  ci/install_julia.sh, tests/conftest.py — they use relative paths whose sibling
  layout moved together.

Intentionally left: archived docs/archive/session-notes/* retain historical
scratch/jlpy-interop paths (they describe past sessions).

Verification

• git diff origin/master --stat --find-renames: all 60 moves show as renames
  (including test_tuple_boxing.py/test_arg_rooting.py from Autobox Python tuple -> Julia Tuple #13/Root freshly-boxed call args immediately, not after the whole list #14).
• python -m compileall src tests demos -q: passes.
• make -C csrc (dlopen mode, JULIA_INCLUDE_PATH → juliaup 1.12.6 headers): builds
  csrc/build/libjl2py.so cleanly, confirming the Makefile's relative output path
  survives the move.
• pytest not run locally (that's CI's job).

🤖 Generated with Claude Code

https://claude.ai/code/session_01V9jVcSYDNXtbBGfcAEPwvh