Fix Life Pulse rhythm workspace scoping

[cursor]

Summary

• Fix a critical workspace split in desktop Life Pulse rhythm: due checks used the active workspace, but skilllite schedule tick ran without --workspace.
• Pass the active workspace through the existing schedule tick --workspace <path> CLI contract.
• Add a focused regression test that preserves workspace paths containing spaces as a single argument.

Task Linkage

• Task ID: TASK-2026-070
• Task folder: tasks/TASK-2026-070-life-pulse-rhythm-workspace/

Injected Specs

• spec/architecture-boundaries.md (assistant/CLI boundary reviewed; no dependency changes)
• spec/security-nonnegotiables.md (not sandbox/security policy)
• spec/testing-policy.md (Rust code change)
• spec/docs-sync.md (reviewed; no docs needed because this uses an existing documented flag)

Validation Evidence

• Commands executed:
  • cargo fmt --check
  • python3 scripts/validate_tasks.py
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml life_pulse::tests::rhythm_args_include_active_workspace
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml
  • cargo test
  • cargo clippy --all-targets -- -D warnings
• Key results:
  • Format check passed.
  • Task validation passed: 70 task directories checked.
  • Focused Life Pulse test passed: 1 passed; 0 failed.
  • Assistant Tauri crate tests passed: 54 passed; 0 failed.
  • Root cargo test passed.
  • Root Clippy is blocked by a pre-existing unrelated lint: crates/skilllite-core/src/config/schema.rs:313 clippy::manual_filter.

Regression Scope

• Areas likely affected:
  • Desktop Life Pulse rhythm subprocess startup.
  • Scheduled agent runs launched from desktop heartbeat.
• Explicit non-goals:
  • CLI schedule behavior outside Life Pulse.
  • Evolution growth subprocess behavior.
  • Schedule file/state semantics.

Docs Sync (EN/ZH)

• Not needed
• Updated EN + ZH docs
• Files:
  • N/A

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