Use Claude to upgrade bitcoin dependency

FYI claude left the repo with a broken build. I fixed the build as a
separate patch for reasons listed below.

First I got claude to create a CLAUDE.md file. Then I pointed it at:

- A local `rust-bitcoin` directory on the release tracking branch
    rust-bitcoin/rust-bitcoin#5169
- The docs online for `bitcoin v0.32.7`
- The `rust-miniscript` repo

And asked it to do the upgrade. It took me three goes over the weekend
to do this, hitting session limits twice.

I am pushing the raw changes Claude made so:

- I can review them in public
- We can learn how good/bad Claude is for doing upgrades

Author: tcharding

.claude/settings.local.json

@@ -0,0 +1,16 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(cargo check:*)",
+      "Bash(find:*)",
+      "Bash(xargs cat:*)",
+      "Bash(grep:*)",
+      "Bash(cargo doc:*)",
+      "Bash(cat:*)",
+      "Bash(1)",
+      "Bash(cargo test:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}