fix: update Claude from latest channel via install

[amanthanvi]

Summary

• Retarget the Claude module to claude install latest on Bash and native Windows (documented channel install target).
• Drop the incorrect claude update latest operand: claude update follows autoUpdatesChannel and does not accept a channel argument.
• Align README, SPEC, changelog, and Bash/Windows tests.

Verification

• Local: ./scripts/lint.sh, ./scripts/test.sh
• Live Claude Code CLI check: claude update --help documents no positional args; claude install [target] accepts latest/stable/version.

Summary by Sourcery

Update Claude Code installations to use the latest release channel across supported implementations.

Bug Fixes:

• Update the Claude Code module to install Claude from the latest release channel on Bash and native Windows.

Documentation:

• Align the README, specification, and changelog with the updated Claude Code installation behavior.

Tests:

• Update Bash and native Windows coverage for Claude command execution and dry-run output.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR changes Claude updates on Bash and native Windows to invoke claude update latest, extends command and dry-run assertions for both implementations, and synchronizes the README, specification, and changelog.

Sequence diagram for updating Claude from the latest channel

sequenceDiagram
    participant User
    participant BashUpdates
    participant WindowsUpdates
    participant ClaudeCLI

    alt Bash implementation
        User->>BashUpdates: run updates
        BashUpdates->>ClaudeCLI: claude update latest
        ClaudeCLI-->>BashUpdates: exit status
    else Native Windows implementation
        User->>WindowsUpdates: run updates
        WindowsUpdates->>ClaudeCLI: update latest
        ClaudeCLI-->>WindowsUpdates: ExitCode
    end

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File-Level Changes

Change	Details	Files
Explicitly target Claude Code’s latest release channel in both update implementations.	Change the Bash module command to claude update latest. Pass update latest to the native Windows PowerShell implementation.	updates updates-main.ps1
Update automated coverage to verify the new command and dry-run behavior across platforms.	Assert Bash execution and dry-run output include claude update latest. Update native Windows execution and dry-run assertions for the latest-channel argument.	tests/test_cli.sh tests/test_windows_native.ps1
Align user-facing documentation with the latest-channel update behavior.	Document the explicit latest-channel command in the README, specification, and changelog.	README.md SPEC.md CHANGELOG.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. If the channel selection is wrong, the command can install an unintended Claude Code version that persists after this change is reverted and may affect subsequent CLI runs. The installation can generally be repaired by reinstalling or updating to the intended version, so the impact is bounded rather than irreversible.

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[greptile-apps]

Greptile Summary

This change updates the Claude module to request the latest release channel and aligns its tests and documentation. The added positional argument breaks Claude updates: the Bash module invokes claude update latest, which Claude rejects before performing an update. Removing only latest allows the same selected module to complete successfully. The Windows implementation builds the same invalid argument list.

T-Rex validation blocked

Native Windows execution could not run because the required PowerShell tool (pwsh or powershell) is unavailable in this Linux environment. The Windows source constructs the same update, latest invocation that failed in the Bash reproduction.

Merge safety: do not merge until both Claude module implementations invoke claude update without latest, and the corresponding command assertions are updated.

Confidence Score: 4/5

The change is not safe to merge because it makes the Claude update action fail when Claude rejects the extra positional argument.

The failure was reproduced through the real Bash module path with a contract-faithful Claude stub, then resolved by removing only the extra argument in an isolated copy. The native Windows invocation was confirmed by source inspection but could not be run locally.

Files Needing Attention: updates and updates-main.ps1 need the invalid argument removed; tests/test_cli.sh and tests/test_windows_native.ps1 need their command expectations corrected.

T-Rex Logs

What T-Rex did

• T-Rex produced proof for a posted P1 finding.
• T-Rex produced proof for another posted P1 finding.
• General contract validation showed native Windows execution could not be performed in the Linux environment due to missing pwsh/powershell, and that updates-main.ps1 uses the same arguments as the Bash failure.
• General contract validation also documented that removing the 'latest' argument from the Bash flow yields a successful stub and exit, confirming the expected argument handling while Windows tooling remains unavailable.

_{Ran code and verified through T-Rex}

Comments Outside Diff (1)

1. General comment

   Claude update modules pass an unsupported latest positional argument

   • Bug
     • The Bash module executes claude update latest at updates:3658; the native Windows module passes @('update', 'latest') to its process runner at updates-main.ps1:1356. Claude's documented update command is claude update, and the focused contract harness shows the extra operand makes the selected Bash module fail. Because PowerShell supplies the same two arguments through ProcessStartInfo.ArgumentList, its native Windows module will likewise invoke the unsupported form.
   • Cause
     • The implementation treats latest as an update-channel operand even though claude update itself performs the latest-version update and accepts no positional channel operand. Existing focused tests encode and assert the same invalid command rather than its runtime CLI contract.
   • Fix
     • Change Bash run claude update latest to run claude update; change PowerShell -ArgumentList @('update', 'latest') to -ArgumentList @('update'); update dry-run text and focused Bash/Windows test assertions accordingly.

   _{Ran code and verified through T-Rex}

Prompt To Fix All With AI

### Issue 1
updates:3658
**Claude update command includes an unsupported operand**

`claude update` does not accept a release-channel positional argument. This invocation runs `claude update latest`, which exits with an unexpected-argument error and causes the selected Claude update to fail. `updates-main.ps1` constructs the same `@('update', 'latest')` argument list, so native Windows has the same behavior. Remove `latest` from both invocations and update the dry-run and fixture expectations to assert `claude update`.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "fix: update Claude from latest channel" | Re-trigger Greptile}

[greptile-apps]

Claude update command includes an unsupported operand

claude update does not accept a release-channel positional argument. This invocation runs claude update latest, which exits with an unexpected-argument error and causes the selected Claude update to fail. updates-main.ps1 constructs the same @('update', 'latest') argument list, so native Windows has the same behavior. Remove latest from both invocations and update the dry-run and fixture expectations to assert claude update.

_{Ran code and verified through T-Rex}

Prompt To Fix With AI

This is a comment left during a code review.
Path: updates
Line: 3658

Comment:
**Claude update command includes an unsupported operand**

`claude update` does not accept a release-channel positional argument. This invocation runs `claude update latest`, which exits with an unexpected-argument error and causes the selected Claude update to fail. `updates-main.ps1` constructs the same `@('update', 'latest')` argument list, so native Windows has the same behavior. Remove `latest` from both invocations and update the dry-run and fixture expectations to assert `claude update`.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.