Fix evolution reset and repair workspace roots

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Summary

• Fixes a critical workspace split-brain bug in skilllite evolution reset --force: reset now scopes prompt/log/snapshot state to the selected workspace chat/ root and removes _evolved under the effective workspace skills root.
• Fixes skilllite evolution repair-skills so desktop/CLI repair validates the selected workspace skills root (skills/ with .skills fallback) instead of silently scanning legacy .skills.
• Adds focused regression coverage for reset default workspace behavior, explicit --workspace override behavior, and repair's modern-vs-legacy skills-root selection.

Bug and Impact

• evolution reset --force could reset a different chat store through paths::chat_root() while leaving current workspace skills/_evolved intact, causing data loss in the wrong store and stale evolved skills in the intended workspace.
• evolution repair-skills could validate .skills and report success while broken skills under modern skills/_evolved were never checked.

Root Cause

• Recent workspace-scoping fixes aligned most evolution commands with project-local chat/ and effective skills roots, but reset/repair retained legacy/global root resolution.

Fix

• Added --workspace/-w to evolution reset and evolution repair-skills with default ..
• Routed reset through chat_root_for_workspace and resolve_run_skills_root.
• Routed repair through the same effective skills-root resolver and updated the desktop repair subprocess to pass --workspace explicitly.
• Updated EN/ZH architecture docs and task artifacts.

Task Linkage

• Task ID: TASK-2026-070
• Task folder: tasks/TASK-2026-070-evolution-reset-repair-workspace/

Injected Specs

• spec/architecture-boundaries.md
• spec/security-nonnegotiables.md (not applicable; no sandbox/security policy changes)
• spec/testing-policy.md
• spec/docs-sync.md

Validation Evidence

• Commands executed:
  • rustup update stable && rustup default stable && rustc --version && cargo --version
  • cargo test -p skilllite --test cli_evolution_workspace
  • cargo fmt --check
  • python3 scripts/validate_tasks.py
  • cargo clippy --all-targets -- -D warnings
  • cargo test
  • cargo test -p skilllite
• Key results:
  • Rust toolchain updated to rustc 1.96.1, cargo 1.96.1 after initial Cargo 1.83 edition-2024 manifest failure.
  • Focused workspace tests: 4 passed; 0 failed.
  • Task validation: Task validation passed (70 task directories checked).
  • cargo clippy --all-targets -- -D warnings: passed.
  • cargo test: passed.
  • cargo test -p skilllite: passed.

Regression Scope

• Areas likely affected:
  • skilllite evolution reset CLI behavior and destructive workspace root selection.
  • skilllite evolution repair-skills CLI/desktop subprocess behavior.
  • Evolution workspace root selection for modern skills/ vs legacy .skills.
• Explicit non-goals:
  • No changes to LLM repair logic.
  • No sandbox or execution policy changes.
  • No changes to unrelated legacy prompt commands (disable, explain).

Docs Sync (EN/ZH)

• Not needed
• Updated EN + ZH docs
• Files:
  • docs/en/ASSISTANT-SPLIT-ARCHITECTURE.md
  • docs/zh/ASSISTANT-SPLIT-ARCHITECTURE.md

Review Checklist

• Acceptance criteria in tasks/TASK-2026-070-evolution-reset-repair-workspace/TASK.md satisfied.
• tasks/TASK-2026-070-evolution-reset-repair-workspace/STATUS.md updated with latest progress.
• tasks/TASK-2026-070-evolution-reset-repair-workspace/REVIEW.md includes merge readiness decision.
• tasks/board.md status is up to date.