Repoint five dead URLs across five pages and drop the Netlify preview converter

[pdoxoverflow]

Fixes the approved bounty "Five dead links on English pages that ZecHub bounties rewrote in the last two months, including a Netlify deploy-preview URL" (pdoxoverflow, 0.02 ZEC).

Every old URL below returned 404 and every new one returned 200 on 2026-09-10, checked with a browser user agent (Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 ... Chrome/124).

Page	Dead (404)	Now points at (200)
Using_Zcash/Transparent_Exchange_Addresses.md L19	690e9524c66a3ecac5d54eff--jade-brioche-873777.netlify.app/	zips.z.cash/zip-0320#reference-implementation (hosted-converter sentence dropped)
guides/Raspberry_Pi_4_Full_Node.md L153	zcash.github.io/wallet	zcash.github.io/zallet/
Using_Zcash/Wallets.md L65	blog.nerdbank.net/ezcash-app	play.google.com/store/apps/details?id=com.Nerdbank.eZcash.App
Using_Zcash/Wallets.md L242	trezor.io/learn/a/zcash-zec	trezor.io/learn/supported-assets/other-cryptocurrencies/zcash-what-it-is-and-how-it-works-with-trezor
Zcash_Tech/ZAP1_Attestation_Protocol.md L48	frontiercompute.io/operators.html	github.com/Frontier-Compute/zap1/blob/main/OPERATOR_GUIDE.md
Zcash_Community/Community_Projects.md L78	blog.nerdbank.net/ezcash-app	same Play listing as Wallets.md

The last row is outside the listing. It's the same dead eZcash URL as Wallets.md L65, so leaving it would've meant fixing the link on one page and shipping it broken on the next.

Why the TEX converter link was dropped rather than replaced

The old link was a Netlify deploy preview (<deploy-id>--<site>.netlify.app), the throwaway address of one build. The bounty says not to re-pin it to a newer preview, so I looked for a permanent home first:

• The site's production alias (jade-brioche-873777.netlify.app) is up and does convert t1 to TEX. But it's a randomly named site with no source repo or owner listed, and I'd rather not send readers to paste addresses into something nobody can vouch for. If a maintainer knows who runs it, swapping it back in is a one-line change.
• zechub.wiki's own Address Decoder (/tools?tool=address-decoder) only goes one way. I ran the ZIP 320 test vectors through the library it uses (@elemental-zcash/zaddr_wasm_parser 0.2.0): tex1s2rt77ggv6q989lr49rkgzmh5slsksa9khdgte decodes to t1VmmGiyjVNeCjxDZzg7vZmd99WyzVby9yC, but a t1 input returns only {"p2pkh": ...} with no TEX. So it can't do the t1 to TEX conversion this paragraph is about.
• zcashd's z_converttex RPC went away with zcashd.

The sentence before the link already tells readers to run the reference implementation in ZIP 320, so that mention is now the link, pointing straight at the #reference-implementation section (a short JavaScript snippet).

Notes on the other replacements

• Zallet Book now lives at zcash.github.io/zallet/. Four other wiki pages (Developer_Resources, Zcash_Resources, Viewing_Keys, the zcashd migration guide) already use that URL.
• eZcash: the blog page is gone (WordPress "Page not found" with or without the trailing slash). The Google Play listing is published by Andrew Arnott and was last updated 2026-01-29. It's the only live first-party page I found. It covers Android, while the Wallets entry lists Android, iOS and Windows. If you'd rather not have a store link, the other honest option is unlinking the heading.
• Trezor: its KB article on Zcash says Trezor devices only support t-addresses, which matches the entry's Pools: Transparent.
• ZAP1: frontiercompute.io is now a single-page site with no operators page (/operators, /operators.html and the .cash equivalents all 404). The operator guide is OPERATOR_GUIDE.md at the root of the zap1 repo, which the same list already links for the source and protocol spec.

Translations

The 5 pages are curated, so their 90 translated copies (18 locales × 5 pages) carry the same dead URLs. They get the same swaps. On the TEX page each copy drops its hosted-converter sentence and links its existing zip-320 mention, the same edit as English.

translation/sync-state.json records the pass for all 90 entries as tool: <existing>+deadlink-5pages, with edited left false. Source hashes aren't touched, so the pipeline still retranslates the prose normally. Same pattern as #2022.

96 files: 5 English pages, 90 translated copies, 1 manifest.

Overlap with open PRs

• docs: repair reference and contents links #2035 changes the same English Zallet Book line to the same URL. Identical hunks, so the two merge cleanly in either order (I test-merged both ways). This PR also fixes the 18 translated copies, which docs: repair reference and contents links #2035 doesn't touch.
• Update Community_Projects.md #2025 and Update Community_Projects.md #2069 add new entries (Konclave, ZecGuard, Zecpad) to Community_Projects.md. Both test-merged cleanly in either order.
• i18n: restore the wallet brand names on Wallets.md (5 machine locales) #2070 touches the same ee eZcash heading and the ee/ig/sw Wallets.md `tool` fields. Whichever lands second needs a 4-line rebase (keep i18n: restore the wallet brand names on Wallets.md (5 machine locales) #2070's label, this PR's URL, and `+segmenter-fix+deadlink-5pages`). Happy to rebase this one.

Checks (run against the commit, base main @ 238f7bee)

node scripts/check-protected-terms.mjs --base upstream/main
  Protected terminology validation passed for 3762 translated page(s).
  (pre-existing violations reported as a notice, 0 from this change)
node scripts/check-frontmatter.mjs --base upstream/main
  Front-matter parity holds for 3762 translated page(s).
node translation/check-invariants.mjs --base upstream/main
  Manifest invariants hold: 209 curated pages, 18 locales.
node translation/gen-menu-titles.mjs --check
  menu-titles manifests up to date (19 files).
node --test translation/lib/*.test.mjs
  pass 86, fail 0

After the change, none of the five dead URLs appears as a link anywhere in site/ or translations/. One mention is left in newsletter/Digest 12-01-2025.md, inside the text of a quoted tweet whose link goes to x.com. It's an archived digest, so I left it alone.