Fix Life Pulse workspace binding for background runs

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Summary

• Fixes a recent desktop Life Pulse regression where background evolution run and schedule tick subprocesses were spawned without the selected workspace.
• Keeps the desktop bridge on the CLI boundary by adding a small command builder that applies current_dir, --workspace, and absolute SKILLLITE_WORKSPACE consistently.
• Restores desktop periodic growth anchor advancement so the A9 periodic arm can actually reach its configured interval after read-only status checks.

Task Linkage

• Task ID: TASK-2026-069
• Task folder: tasks/TASK-2026-069-daily-critical-bug-sweep/

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:
  • cargo fmt --check
  • python3 scripts/validate_tasks.py
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml life_pulse --lib
  • cargo test --manifest-path crates/skilllite-assistant/src-tauri/Cargo.toml evolution_ui::growth --lib
  • cargo clippy --all-targets -- -D warnings
• Key results:
  • Task validation passed (69 task directories checked).
  • life_pulse targeted tests: 2 passed; 0 failed.
  • evolution_ui::growth targeted tests: 3 passed; 0 failed.
  • Root clippy finished successfully with -D warnings.

Regression Scope

• Areas likely affected:
  • Desktop Life Pulse background growth and rhythm subprocesses.
  • Desktop A9 periodic growth anchor diagnostics.
• Explicit non-goals:
  • Manual evolution trigger behavior.
  • Schedule file semantics.
  • Unrelated desktop bridge integrations.

Docs Sync (EN/ZH)

• Not needed
• Updated EN + ZH docs
• Files:
  • N/A - bug fix restores intended workspace behavior; no documented CLI/env contract changed.

Review Checklist

• Acceptance criteria in tasks/TASK-2026-069-daily-critical-bug-sweep/TASK.md satisfied.
• tasks/TASK-2026-069-daily-critical-bug-sweep/STATUS.md updated with latest progress.
• tasks/TASK-2026-069-daily-critical-bug-sweep/REVIEW.md includes merge readiness decision.
• tasks/board.md status is up to date.