From a019511e165ebfae4a6120354e106dba7c585bcd Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Mon, 31 Aug 2026 13:31:06 +0000
Subject: [PATCH] build: drop the reference-only burn submodule that broke
 every git-dep consumer

crates/burn/upstream was a git submodule on AdaWorldAPI/burn used as pure
reference material: crates/burn/src reads nothing from it and crates/burn
is workspace-excluded. Cargo clones git dependencies with submodules
unconditionally, so every consumer of this repo as a git dep (medcare-rs
pulls chacha20 from here) paid a full burn fetch per cold build - and on
2026-08-31 Railway's builder died on that fetch (unauthenticated
fetch-by-SHA against GitHub's shared-IP rate limiting: three spurious
network retries, then the could-not-read-Username credential prompt).

The gitlink was also a commit-pin on an internal sibling - the consumer
pin law one layer down. Removed; provenance (source repo, last gitlink,
upstream lineage tracel-ai/burn v0.21.0-pre.2) recorded in
crates/burn/UPSTREAM-PROVENANCE.md; the sibling repo remains the address
for anyone needing the reference tree.

Workspace check green; the submodule dir was empty (uninitialized) for
every build this session - measured build-inertness, not assumed.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KCGhDYoQBXs3poaR7sFuqp
---
 .gitmodules                        |  3 ---
 crates/burn/UPSTREAM-PROVENANCE.md | 22 ++++++++++++++++++++++
 crates/burn/upstream               |  1 -
 3 files changed, 22 insertions(+), 4 deletions(-)
 delete mode 100644 .gitmodules
 create mode 100644 crates/burn/UPSTREAM-PROVENANCE.md
 delete mode 160000 crates/burn/upstream

diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index 79ef9dd4..00000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "crates/burn/upstream"]
-	path = crates/burn/upstream
-	url = https://github.com/AdaWorldAPI/burn.git
diff --git a/crates/burn/UPSTREAM-PROVENANCE.md b/crates/burn/UPSTREAM-PROVENANCE.md
new file mode 100644
index 00000000..a1e8aa10
--- /dev/null
+++ b/crates/burn/UPSTREAM-PROVENANCE.md
@@ -0,0 +1,22 @@
+# Upstream provenance — where the reference tree went
+
+`crates/burn/upstream` was a git SUBMODULE pointing at
+`https://github.com/AdaWorldAPI/burn.git` (last gitlink
+`9b2b67127b0fbb5387021faf540b7b12b9c4e943` = that repo's merge of PR #4;
+upstream lineage: tracel-ai/burn, `v0.21.0-pre.2`). It was pure reference
+material: `crates/burn/src` reads nothing from it, and `crates/burn` is
+workspace-EXCLUDED besides.
+
+It is gone because a reference-only submodule taxes EVERY consumer of this
+repo as a git dependency: cargo clones git deps with submodules
+unconditionally, so `medcare-rs`'s Railway build fetched the full burn fork
+just to compile `chacha20` out of this repo — and on 2026-08-31 that fetch
+died on GitHub's unauthenticated shared-IP rate limiting
+("could not read Username", after three spurious-network retries), taking
+the deploy down. A gitlink is also a commit-pin on an internal sibling —
+the consumer pin law's spirit, one layer down.
+
+Need the reference tree? Clone the sibling directly:
+`git clone https://github.com/AdaWorldAPI/burn.git` — the fork repo is the
+address; this file is the provenance record (tags over pins, per the
+internal-pin prohibition).
diff --git a/crates/burn/upstream b/crates/burn/upstream
deleted file mode 160000
index 9b2b6712..00000000
--- a/crates/burn/upstream
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9b2b67127b0fbb5387021faf540b7b12b9c4e943