A git merge driver that performs a three-way merge of Electron's `patches/**/.patches` files as ordered lists rather than line unions. Correctly handles deletions, renames (delete+add), additions anchored to surviving neighbors, duplicate collapsing, and conflicting reorders — writing a union fallback and exiting non-zero when undecidable so git leaves the file conflicted. The pure functions (parsePatchList, mergePatchLists, formatPatchList) are exhaustively unit-tested. A standalone example of solving a recurring version-control problem (ordered metadata files under merge) that could be extracted to any project maintaining ordered lists in git.

Installs the patches merge driver into an arbitrary git checkout: writes repo-local `merge.patches-list.*` config and appends an override to `$GIT_DIR/info/attributes`. Notable craftsmanship: shellQuote escapes paths for git's `sh -c` invocation (single quotes keep `$`/backticks literal, embedded quotes become `'\''`, backslashes normalized), `git rev-parse --git-path` makes it work inside worktrees, `--replace-all` tolerates stray duplicate config, and the driver command is rewritten on every `e sync` so moved checkouts or new node versions self-heal. The never-fatal registration variant is designed for embedding in larger flows.

A complete port of cloudflared's Cloudflare Access browser-login token transfer protocol, eliminated the need to shell out to the `cloudflared` binary. It discovers the Access app AUD from redirect headers, constructs the `cdn-cgi/access/cli` login URL, generates an ephemeral NaCl box keypair, long-polls the transfer store with per-poll timeouts, decrypts the JWT (nonce[24] + box), and caches it in `~/.cloudflared` with expiry detection. The AccessClient wrapper transparently re-authenticates on 401 challenges. Self-contained (one internal import) and directly reusable for any Access-protected HTTP API.

Standalone downloader script used for SDK and reclient artifacts, run as `node download.js <url> <path>`. Thoughtful failure engineering: flattens Node's fetch error cause chains into readable one-liners (ENOTFOUND, ECONNRESET, etc.), classifies retryable vs non-retryable failures (network/5xx/429/408 retry; 403/404 and local write errors like ENOSPC do not), detects truncated transfers by comparing bytes written to Content-Length only when no Content-Encoding is present, writes to a fresh stream per attempt, and retries with exponential backoff (1/2/4/8s) up to 5 attempts. The download logic with its retry classifier is a reusable pattern for any artifact-fetching pipeline.