Fix desktop evolution workspace scoping

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Summary

• Fixes a critical desktop evolution state-splitting bug where chat/evolution subprocesses could use different effective SKILLLITE_WORKSPACE values, causing manual evolution to see an empty DB and user-authorized capability evolution to silently force-run against the wrong DB.
• Uses the explicit desktop-selected workspace as the child process data root, propagates --workspace into background authorization runs, and aligns evolution run skill output with the desktop skills/-first resolver while preserving .skills/ legacy fallback.

Task Linkage

• Task ID: TASK-2026-067
• Task folder: tasks/TASK-2026-067-desktop-evolution-workspace-scope/

Injected Specs

• spec/architecture-boundaries.md (if architecture/layering changed)
• spec/security-nonnegotiables.md (if sandbox/security changed)
• spec/testing-policy.md (required for any code change)
• spec/docs-sync.md (if behavior/docs/env/commands changed)

Validation Evidence

• Commands executed:
  • rustup update stable && rustup default stable
  • npm ci && npm run build in crates/skilllite-assistant
  • cargo fmt --check
  • cargo clippy --all-targets -- -D warnings
  • cargo test
  • cargo test -p skilllite
  • cargo test -p skilllite-commands
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml explicit_workspace_env_overrides_dotenv_workspace
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml background_run_args_include_explicit_workspace
  • python3 scripts/validate_tasks.py
• Key results:
  • cargo test -p skilllite-commands: 23 passed; 0 failed.
  • cargo test -p skilllite: CLI unit/integration suites passed, including e2e_minimal.
  • cargo clippy --all-targets -- -D warnings: finished successfully.
  • cargo test: workspace tests and doctests completed successfully.
  • Assistant focused tests: each filtered regression test passed after installing Linux Tauri build dependencies and generating dist.
  • python3 scripts/validate_tasks.py: Task validation passed (67 task directories checked).

Regression Scope

• Areas likely affected:
  • crates/skilllite-assistant/src-tauri/src/skilllite_bridge/chat.rs
  • crates/skilllite-assistant/src-tauri/src/skilllite_bridge/evolution_cli.rs
  • crates/skilllite-assistant/src-tauri/src/skilllite_bridge/integrations/evolution_ui/authorize.rs
  • crates/skilllite-assistant/src-tauri/src/skilllite_bridge/paths.rs
  • crates/skilllite-commands/src/evolution.rs
• Explicit non-goals:
  • Runtime provisioning progress streaming.
  • Skills-list fallback/error policy.
  • Evolution scoring, LLM behavior, or sandbox policy changes.

Docs Sync (EN/ZH)

• Not needed
• Updated EN + ZH docs
• Files:
  • N/A: no public flags, documented commands, or architecture contracts changed; this aligns behavior with the existing explicit workspace contract.

Review Checklist

• Acceptance criteria in tasks/.../TASK.md satisfied (or explicitly deferred)
• tasks/.../STATUS.md updated with latest progress
• tasks/.../REVIEW.md includes merge readiness decision
• tasks/board.md status is up to date