feat(cli): animate anyr update with from→to and channel

[duyet]

Closes #38.

Rebased onto main after #39 (97d3370). TUI tickets are untouched. This PR still only changes anyr update progress UX.

anyr update now matches the interaction Duyet asked for: a spinner that actually ticks, current → target version plus the configured channel, then a checkmark success line and the restart hint.

❯ anyr update

⠋ Updating v0.1.11 -> v0.1.99 (beta channel)
✔ Updated to v0.1.99

Run anyr to start using the new version.

Versions in the snippet above are format examples from help. The binary prints the real running version and the selected GitHub tag. No invented model ids.

What changed

• New src/spinner.rs: braille frames advance on a timer (\r rewrite). Consecutive frames are distinct; a TTY spinner waits for a minimum number of ticks before succeeding, so a frozen [loading icon] cannot happen.
• Install path prints Updating vX -> vY (<channel> channel), then ✔ Updated to vY (or Would update to when a fixture/--dry-run skips the replace).
• --check keeps the labeled current/latest/channel report.
• Checksum-before-replace (Plan 005: Verify a checksum before replacing the binary during self-update #20) is untouched. TUI tickets TUI model/account/key switches are global; keys fall back to default #35/TUI: pick an agent first, then change that agent’s model/account/key #36/TUI model picker: select anyrouter/auto, do not dump most-used models #37 are untouched.

Verification

Driven with verify-anyr (control-anyr launch / doctor / cli) plus the in-repo suite.

Proof	Result
Non-TTY anyr update (fixture)	Updating vX -> vY (<channel> channel) then ✔ Would update to vY and Run anyr to start using the new version.
Tests	update_spinner_animates_on_tty, update_prints_from_to_channel_and_success

Artifacts: .cursor/skills/verify-anyr/artifacts/update-progress/

cargo test --locked --lib --test cli: passed after rebase.

Checklist

• Version stays on 0.1.x (do not introduce 0.2 / 1.0)
• Do not auto-merge release-please PRs

  

[github-actions]

anyr size and startup

Startup is wall time for a cold anyr --version / anyr --help (median of 21 runs). Size is the stripped release binary, or the .wasm for the browser demo.

Size budget: anyr-linux-x86_64 must stay ≤ 4.0 MiB (4194304 bytes) stripped.

Asset	Kind	Size	--version median	--help median
anyr-darwin-arm64	native	2.8 MiB	4.71 ms	4.15 ms
anyr-darwin-x86_64	native	2.9 MiB	39.38 ms	36.56 ms
anyr-linux-arm64	native	2.7 MiB	0.7 ms	0.68 ms
anyr-linux-x86_64	native	3.0 MiB	1.03 ms	0.97 ms
anyr-windows-x86_64.exe	native	2.5 MiB	8.66 ms	8.62 ms
anyr.wasm	wasm	176.2 KiB	—	—

Budget check: ok

raw timings

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