rename: the docs say Inkwell, and nothing else still says ThoughtSync by accident

Step 6 of milestone 481. README, docs/*, ci-requirements.md, the desktop and
Arch READMEs, alembic.ini, .gitignore, the frontend package name, the service
worker's cache name (its activate handler deletes any cache by another name, so
the old one is cleaned up), and the Android names in the release body.

What still says thoughtsync does so on purpose (Scribe note 5071):
- the desktop data crossover (crossover.rs) and its startup log
- the old-export import marker
- the "Upgrading from ThoughtSync" block in .env.example, and compose's pointer
  to it
- the packages being retired: deb conflicts/replaces thought-sync, pacman
  thoughtsync and thoughtsync-desktop
- the Android signing keyAlias, which names a key in the existing keystore
- history: shipped alembic migrations, and the test-binary hashes that
  ci-requirements.md records from 2026-08-18

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

desktop/packaging/arch/README.md

@@ -1,6 +1,6 @@
-# ThoughtSync desktop — Arch package
+# Inkwell desktop — Arch package
 
-A **prebuilt** native pacman package, published as an asset on every ThoughtSync
+A **prebuilt** native pacman package, published as an asset on every Inkwell
 release. Nothing to compile, no toolchain to install.
 
 Installing natively on Arch matters for more than tidiness: pacman pulls
@@ -15,22 +15,22 @@ Easiest — the one-command installer picks this package automatically on any
 pacman system:
 
 ```sh
-curl -fsSL https://git.fabledsword.com/bvandeusen/thoughtsync/raw/branch/dev/desktop/packaging/install.sh | sh
+curl -fsSL https://git.fabledsword.com/bvandeusen/inkwell/raw/branch/dev/desktop/packaging/install.sh | sh
 ```
 
 That installs the newest build from `main`. To follow the rolling development
 channel instead, pass the flag through the pipe:
 
 ```sh
-curl -fsSL https://git.fabledsword.com/bvandeusen/thoughtsync/raw/branch/dev/desktop/packaging/install.sh | sh -s -- --channel dev
+curl -fsSL https://git.fabledsword.com/bvandeusen/inkwell/raw/branch/dev/desktop/packaging/install.sh | sh -s -- --channel dev
 ```
 
 Or grab the `.pkg.tar.*` from the
-[releases page](https://git.fabledsword.com/bvandeusen/thoughtsync/releases)
+[releases page](https://git.fabledsword.com/bvandeusen/inkwell/releases)
 and install it directly:
 
 ```sh
-sudo pacman -U thoughtsync-*-x86_64.pkg.tar.*
+sudo pacman -U inkwell-*-x86_64.pkg.tar.*
 ```
 
 The compression suffix depends on what the build image provides — `.zst` when
@@ -39,17 +39,18 @@ all of them; only the filename differs.
 
 Either way you get:
 
-- `/usr/bin/thoughtsync` — the app
-- `/usr/share/applications/thoughtsync.desktop` — the menu entry
-- `/usr/share/icons/hicolor/*/apps/thoughtsync.png` — themed icons
+- `/usr/bin/inkwell` — the app
+- `/usr/share/applications/inkwell.desktop` — the menu entry
+- `/usr/share/icons/hicolor/*/apps/inkwell.png` — themed icons
 
-Launch **ThoughtSync** from your app menu, or run `thoughtsync`.
+Launch **Inkwell** from your app menu, or run `inkwell`.
 
-Uninstall: `sudo pacman -R thoughtsync`.
+Uninstall: `sudo pacman -R inkwell`.
 
-The package was called `thoughtsync-desktop` before; it declares `replaces`/
-`conflicts` on that name, so an upgrade from it is a normal `pacman -U` and
-leaves nothing behind.
+The package was called `thoughtsync` until the app was renamed Inkwell, and
+`thoughtsync-desktop` before that. It declares `replaces`/`conflicts` on both
+names, so an upgrade from either is a normal `pacman -U` and leaves nothing
+behind.
 
 ## How the package is built
 

desktop/packaging/publish-release.sh

@@ -149,7 +149,7 @@ fi
 echo "==> Creating release for $TAG"
 BODY=$(cat <<JSON
 {"tag_name":"$TAG","name":"Inkwell $CHANNEL_LABEL","draft":false,"prerelease":$RELEASE_PRERELEASE,
- "body":"Inkwell $CHANNEL_LABEL.\n\n**Desktop**\n\n- **Debian / Ubuntu** — native \`.deb\`\n- **Arch / CachyOS** — native \`.pkg.tar.*\`\n- **everything else** — \`.AppImage\` (de-bundled graphics: renders on any GPU/Wayland setup)\n\nInstall / update — picks the right one for your system:\n\`\`\`\ncurl -fsSL $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/raw/branch/dev/desktop/packaging/install.sh | $INSTALL_TAIL\n\`\`\`\n\n**Android** — \`thoughtsync.apk\`. Copy it and \`thoughtsync-android.json\` into your server's \`/var/inkwell/client/\` and the server will offer it to your devices; see docs/android-distribution.md.$CHANNEL_NOTE"}
+ "body":"Inkwell $CHANNEL_LABEL.\n\n**Desktop**\n\n- **Debian / Ubuntu** — native \`.deb\`\n- **Arch / CachyOS** — native \`.pkg.tar.*\`\n- **everything else** — \`.AppImage\` (de-bundled graphics: renders on any GPU/Wayland setup)\n\nInstall / update — picks the right one for your system:\n\`\`\`\ncurl -fsSL $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/raw/branch/dev/desktop/packaging/install.sh | $INSTALL_TAIL\n\`\`\`\n\n**Android** — \`inkwell.apk\`. Copy it and \`inkwell-android.json\` into your server's \`/var/inkwell/client/\` and the server will offer it to your devices; see docs/android-distribution.md.$CHANNEL_NOTE"}
 JSON
 )