feat(workspace): simplify navigation after workspace creation (#30)

Combine cd and venv activation into single command to reduce
copy/paste operations. Users now see one command instead of
2-3 separate steps.

Changes:
- Combine 'cd' and 'source .venv/bin/activate' with && operator
- Remove 'workspace remove' from next steps (confusing after creation)
- Add shlex.quote() for shell-safe path handling
- Update tests to verify new behavior

Closes agentspaces-yjh

Author: ckrough

.beads/issues.jsonl

@@ -0,0 +1 @@
+{"id":"agentspaces-yjh","title":"Simplify workspace navigation and venv activation after creation","description":"## Context\nAfter running 'agentspaces workspace create', users see a 'Next Steps' section with commands to cd and activate venv. This requires copying/pasting long paths.\n\n## Goal\nProvide a simpler way for users to navigate to workspace and activate venv without manual copying/pasting.\n\n## Current Behavior\nUsers must copy/paste:\n1. cd /Users/ckrough/.agentspaces/agentspaces/sleepy-fermat\n2. source .venv/bin/activate\n\n## Desired Behavior\nSingle command or automated navigation that minimizes user effort.\n\n## Files Involved\n- src/agentspaces/cli/workspace.py - workspace create command\n- src/agentspaces/modules/workspace/service.py - workspace creation logic\n\n## Verification\n1. Create a new workspace\n2. Verify simplified navigation/activation works\n3. uv run pytest tests/ -k workspace","status":"closed","priority":2,"issue_type":"feature","created_at":"2026-01-09T14:52:35.442563-05:00","updated_at":"2026-01-09T15:21:26.303403-05:00","closed_at":"2026-01-09T15:21:26.303403-05:00","close_reason":"Implemented: Combined cd and venv activation into single command, removed workspace remove step, added path quoting for safety","created_by":"ckrough"}