fix: update references after the linear-cli-ex -> linear-cli / linear-cli -> linear-cli-rb repo renames

[bougyman]

Summary

Closes #80. Local remotes were already fixed separately (this repo's origin, and vendor/ruby-linear-cli's remote in both .gitmodules and its own checked-out git config). This is everything else that hardcoded the old names:

• install.sh/uninstall.sh: repo= URL and state_dir (renamed now, not kept for backward compat - real installs against the old name are minimal, the tool shipped its first release only a day ago).
• Readme.adoc: 9 occurrences, plus one the blind rename would have gotten backwards - the "port of Ruby's linear-cli" link needs to point at linear-cli-rb now, not this repo. Left the 4 plain-prose "Ruby's linear-cli" mentions alone.
• .github/workflows/main.yaml: the container job's temp tarball filename (cosmetic only).
• vendor/rubyists-homebrew-tap: bumped to the commit fixing its own homepage/download URLs (fix: update references after the linear-cli-ex -> linear-cli repo rename homebrew-tap#2).

CHANGELOG.md's historical release-please-generated links are deliberately left untouched - see #80 for why.

Test plan

• Ran a full install.sh/uninstall.sh round-trip against the renamed state_dir - the release download also resolves correctly at the new repo path
• Verified via the Ruby repo's own gemspec (spec.name = 'linear-cli') that the 4 plain-prose "Ruby's linear-cli" mentions are still accurate and shouldn't change - only its GitHub repo got renamed
• Verified GitHub's repo-rename redirect works (github.com/rubyists/linear-cli-ex -> linear-cli) so nothing was broken pre-fix, just stale
• actionlint clean on main.yaml
• Homebrew formula's release URLs re-verified against the new repo path (downloaded fresh, sha256 unchanged)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates hardcoded repository-name references across scripts, documentation, Git submodules, and CI to reflect the repo renames (rubyists/linear-cli-ex → rubyists/linear-cli, and the Ruby CLI repo → rubyists/linear-cli-rb). This keeps install/uninstall behavior, documentation links, and submodule configuration aligned with the new canonical locations (without relying on GitHub redirects).

Changes:

• Update install.sh/uninstall.sh to use the renamed GitHub repo path and the renamed XDG state directory.
• Refresh Readme.adoc links/commands to point at the new repo names and GHCR image namespace.
• Adjust .gitmodules and CI workflow naming to match the new repo identifiers.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
install.sh	Updates the release download repo slug and the XDG state directory name to the renamed repo.
uninstall.sh	Keeps uninstall manifest lookup consistent with the renamed XDG state directory.
Readme.adoc	Updates GitHub links, curl-pipe install/uninstall URLs, clone instructions, and container image references to the new repo names.
.gitmodules	Points the vendor/ruby-linear-cli submodule URL at the renamed Ruby repo (linear-cli-rb).
.github/workflows/main.yaml	Renames a temporary tarball filename used for Trivy scanning to match the new repo name (cosmetic).

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