revert: "feat: [PR-1797] add sf migrate command and Rust CLI migration banner (#266)"

[sigmachirality]

Summary

Reverts #266 (commit 06230a2).

Motivation

The Rust CLI install script at cli.sfcompute.com does not actually create the promised sf-old fallback (repro: curl -fsSL https://sfcompute.com/cli/install | bash followed by sf migrate leaves no working sf-old on disk). That means anyone who follows the new migration banner or runs sf migrate loses access to the legacy CLI entirely, with no escape hatch.

Pulling the banner + sf migrate command until the install script is fixed.

Testing

• Cut a release from main after this merges so the prompt stops shipping to users.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
src/lib/upgrade.ts	36% smaller
src/checkVersion.ts	17% smaller
src/index.ts	16% smaller
install.sh	Unsupported file format
src/lib/migrate.ts	0% smaller

[indent]

PR Summary

Reverts commit 06230a2 (the sf migrate command and Rust-CLI migration banner) because the Rust installer at cli.sfcompute.com does not actually create the promised sf-old fallback — meaning anyone who followed the banner or ran sf migrate lost access to the legacy CLI. The revert is mechanically clean: a git diff of the head branch against the parent of the original feature commit on the five touched files is empty, and a repo-wide grep for the removed symbols/env vars turns up no stragglers.

• install.sh: drops the SF_CLI_BINARY_NAME / SF_CLI_TARGET_DIR env-var overrides and the "skip PATH nudge on in-place upgrade" branch; reverts to hardcoded sf in ~/.local/bin.
• src/checkVersion.ts: reverts checkVersion() from Promise<boolean> back to Promise<void> (only caller was updated in the same PR).
• src/index.ts: removes the registerMigrate registration, the showMigrateBanner fallback, and the argv[2] === "migrate" auto-upgrade opt-out.
• src/lib/migrate.ts: deleted in full (124 lines).
• src/lib/upgrade.ts: drops the now-unused basename/dirname imports and stops forwarding SF_CLI_TARGET_DIR/SF_CLI_BINARY_NAME to the install script.

Note for the author: this revert lands at package.json version 0.32.2, which is the version the original feature shipped under — a follow-up release: v0.32.3 commit will be needed for the revert to actually reach users via the auto-upgrade flow.

Issues

No issues found.

CI Checks

All CI checks passed on 9b7070e.

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