[Feature] Add CLI search command and missing CRUD commands

[d-oit]

Description

The CLI currently has 6 commands but is missing several important operations that the repository layer supports:

Missing Commands

Command	Description
search <query>	Full-text search from CLI
entity-update <name> [-t type] [-d desc]	Update existing entity
entity-delete <name>	Delete an entity
entity-get <name>	Show entity details
link-create <source> <target> [-r relation]	Create a link
link-list	List all links
link-delete <id>	Delete a link
note-create <entity> <content>	Add a note
note-list <entity>	List notes for entity
snapshot-list	List graph snapshots
db:backup	Create database backup
db:reset	Reset database
db:migrate	Run migrations

Current CLI Commands (6)

init, sync, export, entity-create, entity-list, claim-create

Acceptance Criteria

• search command with FTS5 query support
• entity-update, entity-delete, entity-get commands
• link-create, link-list, link-delete commands
• note-create, note-list commands
• db:backup, db:reset commands
• All new commands have --help documentation
• CLI tests added

[github-actions]

👋 This looks like a duplicate of #183.

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