feat: add memory manager tool - auto-learning knowledge base + HR lifecycle

[NSIETeam]

What

Adds a new memory_manager tool - an auto-learning knowledge base with HR lifecycle management.

Actions (9)

Action	Description
learn	Auto-extract knowledge after task execution, track efficiency trends
recall	Retrieve relevant knowledge before task (employee + department + workflow)
onboard	New employee inherits department SOPs + role workflows instantly
offboard	Departing employee's experience auto-merges into department knowledge
report	Token spend, time saved, ROI (employee + manager views)
update	Manually update knowledge files
sync	Anonymize (phone/email/name) for cloud upload
export	Export all knowledge to single markdown file
list	Show all knowledge files with sizes

Knowledge Structure

~/.easycode/memory/
├── employee.markdown       (LOCAL - personal habits + efficiency)
├── department.markdown     (CLOUD SYNC - SOPs + templates)
├── role.markdown           (CLOUD SYNC - role workflows)
├── workflows/*.md          (task-specific templates)
├── reports/*.md            (token + efficiency reports)
└── archive/                (offboarded employee profiles)

Key Features

• Auto-pattern discovery: After 3+ executions of same task, discovers duration patterns (avg/min/max/trend)
• Efficiency tracking: Tracks improvement over time per task type
• HR lifecycle: Onboard (inherit knowledge) → Work (auto-learn) → Offboard (merge experience to dept)
• ROI reporting: Estimates time saved (3x manual), token cost, money saved, ROI ratio
• Privacy: Sync anonymizes phone numbers, emails, and employee names

Origin

Ported from Otto. Adapted for EasyCode:

• Removed OrgMemoryStore, CodebaseMemoryProvider, skillFormation, topicSimilarity dependencies
• Removed project_* and code_* actions (require additional memory infrastructure)
• Kept core learn/recall/onboard/offboard/report/update/sync/export/list functionality
• Changed storage dir from ~/.otto/ to ~/.easycode/