[dss539]

SSH and WSL shells with Wave shell integration do not receive COLORTERM=truecolor. The default added in #3141 is applied by WaveshellLocalEnvVars, which remote shell startup bypasses. Applications that use this variable to detect color depth can therefore select a reduced-color rendering mode.

Set the default in the shared remote shell swap token, before merging user environment settings. This covers integrated SSH and WSL shells, including durable SSH sessions. Explicit cmd:env values take precedence, and local shells retain their existing handling of inherited COLORTERM.

Related to #2090; follows up on the local-shell implementation in #3141. I searched open and closed issues and PRs for COLORTERM, truecolor, and SSH color support and found no existing PR covering this remaining path.

Validation:

• go test ./pkg/blockcontroller ./pkg/shellexec ./pkg/util/shellutil passed.
• go vet ./pkg/blockcontroller ./pkg/shellexec ./pkg/util/shellutil passed.
• gofmt and git diff --check passed.

Draft pending validation in the desktop app. GitHub Copilot CLI was the affected application that prompted this investigation: setting COLORTERM=truecolor changed its initial appearance, but colors still changed after a message. Adding FORCE_COLOR=3 also produced visual problems. The cause of that continuing rendering behavior remains unconfirmed; this change addresses the missing capability advertisement and does not establish a complete Copilot rendering fix.

[coderabbitai]

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