docs: phase 1 day 2 receipt — CI green, merged, docs expanded

CI confirmed green on all 9 matrix cells; PR #1 merged to main; repo
public; Pages live. Docs site restructured into Diátaxis quadrants
with twelve new pages, iron-clad README, SECURITY.md, and a CONTRIBUTING
quick-start pointing at the long-form guide. All ten Phase 1 exit-gate
items clear; Phase 1 closed pending operator go for Phase 2.

Author: claude

RECEIPTS.md

@@ -54,3 +54,61 @@ Append-only build log for spine-lite-python. Mirrored to the canonical M87 run-r
 - Three exit-gate items (1, 2, 3) require operator action: confirm CI green on the 9-cell matrix, flip repo visibility to public, enable GitHub Pages.
 
 **Next:** Halt for Mac at the Phase 1 exit gate. Phase 2 (manifest + classifier, ~5 working days) does not start without an explicit go.
+
+---
+
+### Phase 1 Day 2 Receipt — 2026-05-08
+
+**Repo:** spine-lite-python branch `claude/setup-project-structure-3YeiT`, ahead of `main` by the docs-expansion commits below.
+**Duration:** ~1.5 hours (continuation of the same Claude Code Web session).
+
+**Tasks completed:**
+
+- **CI fix.** Two commits resolving the `setup-uv@v3` cache-key failure: untrack `uv.lock` from `.gitignore` (with the `design-rationale.md` entry inverted), then commit the lockfile (1,396 lines, 68 packages). Operator confirmed all 9 matrix cells green and merged via PR #1 (`d90e72c`). Repo now public; GitHub Pages live at <https://macfall7.github.io/spine-lite-python/>.
+- **Documentation expansion to archivist grade.** Restructured `docs/` into Diátaxis quadrants (Tutorial / How-To / Reference / Explanation) plus a History section. Twelve new pages, three substantial rewrites of moved pages, mkdocs nav updated, mkdocs --strict clean.
+- **Top-level prose rewritten.** Iron-clad README (status grid, repository layout, copy-paste install, today-vs-later capability matrix, deep links into the docs site), SECURITY.md added (vulnerability reporting, supported versions, trust model, threat model, dependency policy), CONTRIBUTING.md reduced to a quick-start that points at the long-form guide in `docs/how-to/contribute.md`.
+
+**New documentation surface (counts):**
+
+- 1 landing page (`docs/index.md`, rewritten).
+- 1 tutorial (`docs/getting-started.md`).
+- 3 concept pages (overview, effects-taxonomy, posture-and-hooks).
+- 4 how-to pages (use-the-api, wire-claude-code, contribute, release).
+- 4 reference pages (api refined, cli, exceptions, glossary).
+- 5 explanation pages (architecture refined, design-rationale moved, porting-notes expanded, invariants new, faq new).
+- 1 history page (phase-1).
+- 1 SECURITY.md.
+- README + CONTRIBUTING + CHANGELOG updated.
+
+**Verification (local, in sandbox):**
+
+- `ruff check`: pass
+- `ruff format --check`: pass
+- `mypy --strict src tests`: pass, 13 source files clean
+- `pytest`: 35 / 35 passed
+- Coverage: 100% (45 statements, 4 branches, 0 misses)
+- `mkdocs build --strict`: pass
+- CI on the previous push (commits up to `9e65986`): all 9 matrix cells + lint + typecheck + docs-build green; confirmed by operator.
+
+**Phase 1 exit gate (final):**
+
+| # | Item | State |
+|---|------|-------|
+| 1 | Repo public on GitHub | ✓ |
+| 2 | CI green on all 9 matrix cells | ✓ |
+| 3 | Docs deployed to GitHub Pages | ✓ |
+| 4 | `pip install -e .` works in fresh venv | ✓ |
+| 5 | `spine_lite.__version__ == "0.1.0a0"` | ✓ |
+| 6 | `tests/unit/test_effects.py` passes | ✓ (20/20 incl. hypothesis) |
+| 7 | CHANGELOG entry for `v0.1.0a0` | ✓ |
+| 8 | CLAUDE.md ≤ 150 lines | ✓ (91 lines) |
+| 9 | All commits in Conventional Commits format | ✓ |
+| 10 | Receipt appended | ✓ |
+
+All 10 items clear. **Phase 1 closed.**
+
+**Open items / halts:**
+
+- None. Phase 2 (manifest + classifier, ~5 working days, target `v0.2.0a0`) is gated on operator go per `CLAUDE.md`.
+
+**Next:** Halt for Mac at the Phase 1 → Phase 2 transition. Per blueprint §11, completion of Phase 1 unblocks the Braintrust application thread on the operator's side.