Add terminalBackground/terminalForeground to workspace definitions

[OmarOneil]

What

Workspace definitions in cmux.json (commands array) gain two optional keys:

{
  "name": "Barcelona Vibes",
  "cwd": "~/Vibes/Barcelona",
  "terminalBackground": "#1A1A3E",
  "terminalForeground": "#F5A623"
}

Every terminal the workspace launches gets that background/foreground — the per-workspace equivalent of iTerm profiles, useful when you run one workspace per client/brand/environment and want instant visual context.

How

Ghostty already honors per-surface OSC 11/10, and cmux already persists those across restores (#5997). This PR just delivers printf '\033]11;%s\007' '#RRGGBB' on the same path as the existing setup command. Unlike setup (first terminal only), the color command reaches every terminal pane in a layout. Colors are strict #RRGGBB (reuses WorkspaceTabColorSettings.normalizedHex), so the shell interpolation is injection-proof; invalid values fail decoding like an invalid color.

Scope / known limits (v1)

• Launch-time terminals only — tabs/splits created later keep the global theme. Happy to extend to later surface-creation paths in a follow-up if you're open to the feature.
• The printf is briefly visible in scrollback, same as setup.
• Config-file only; no UI (avoids localization surface for v1).

Tests

Three decode tests added beside the existing color test in CmuxConfigTests (normalization, invalid hex throws, palette names rejected). Structured as red/green commits per CLAUDE.md. Draft PR: authored without local Xcode — relying on CI for build/test verification.

🤖 Generated with Claude Code

https://claude.ai/code/session_012ky5zNXk9QSPqvseLkqNU6

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Summary by cubic

Add per-workspace terminal colors to cmux.json via terminalBackground and terminalForeground, applied to every terminal the workspace launches for clearer visual context.

• New Features
  • Add terminalBackground and terminalForeground on workspace definitions, strict #RRGGBB with normalization; invalid values fail decoding.
  • Deliver colors via OSC 11/10 on the same path as setup; for layouts, send to each terminal surface; without layout, prepend to startup commands.
  • Update web/data/cmux.schema.json to document the new keys.
  • Add decode tests for success and rejection cases.
  • v1 scope: launch-time terminals only (later splits/tabs keep global theme).

^{Written for commit e90a80b. Summary will update on new commits.}

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