Use codex update for standalone installs

[BearHuddleston]

What Changed

• Recognize Codex binaries installed by the normal ~/.codex standalone installer.
• Run the supported codex update command instead of treating those installs as npm-managed.
• Execute the update through the Codex path resolved for that provider instance while preserving codex update as the displayed command.
• Cover standalone detection and resolved-executable targeting in focused provider-maintenance tests.

Why

Standalone Codex installations are not managed by npm. Codex already owns its platform-specific self-update flow, so T3 Code only needs to delegate to codex update using the same executable it detected for the provider instance.

This supersedes #3626 with the minimal default-install behavior. Custom CODEX_HOME targeting and version-pinned release paths are intentionally outside this PR.

Validation

• ./node_modules/.bin/vp test run apps/server/src/provider/providerMaintenance.test.ts apps/server/src/provider/Layers/ProviderInstanceRegistryLive.test.ts
• ./node_modules/.bin/vp check apps/server/src/provider/Drivers/CodexDriver.ts apps/server/src/provider/Layers/ProviderInstanceRegistryLive.test.ts apps/server/src/provider/providerMaintenance.test.ts apps/server/src/provider/providerMaintenance.ts
• ./node_modules/.bin/vp run --filter t3 typecheck

Checklist

• This PR is small and focused.
• I explained what changed and why.
• I included before/after screenshots for any UI changes. (Not applicable; this PR has no UI changes.)
• I included a video for animation/interaction changes. (Not applicable; this PR has no animation or interaction changes.)

Note

Enable codex update for standalone Codex installs

• Adds isCodexStandaloneCommandPath helper in CodexDriver.ts that detects if the active binary path is a standalone Codex install (under /.codex/packages/standalone/).
• Sets nativeUpdate in the maintenance resolver to run codex update (with lockKey codex-native) when the helper returns true.
• Adds a test case in ProviderInstanceRegistryLive.test.ts verifying that a standalone binary path produces the expected maintenanceCapabilities update block.

^{Macroscope summarized d91cc75.}

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Note

Low Risk
Scoped to provider maintenance capability detection and update command wiring; no auth or session runtime changes.

Overview
Standalone Codex binaries under ~/.codex/packages/standalone/ are now recognized as native installs, so in-app provider updates run codex update instead of falling back to npm/Homebrew-style maintenance.

Codex driver adds isCodexStandaloneCommandPath and wires nativeUpdate with lock key codex-native, matching how other providers delegate to their own updater.

Provider maintenance gains optional useResolvedExecutable: when set, the update action runs the resolved binary path from capability detection while keeping a human-readable command string (e.g. codex update). Registry tests assert the work Codex instance exposes the expected maintenanceCapabilities for a standalone path.

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[macroscopeapp]

Approvability

Verdict: Needs human review

Enables native update functionality for Codex standalone installs by populating nativeUpdate configuration that was previously null. This activates new runtime behavior (update commands) and warrants human review to verify the intended scope.

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