CLI link suggest command (pyrite link suggest) — pyrite

Problem

The `/api/ai/suggest-links` REST endpoint exists but isn't accessible from CLI. Subagents can't easily call the API (need server URL/port, HTTP calls). CLI is the natural interface for agent workflows.

Proposed Solution

Expose link suggestion as a CLI command:

\`\`\` pyrite link suggest --kb [--target-kb ] [--limit 10] [--format json] \`\`\`

Behavior

Given an entry, find entries in the same or another KB that are likely related (by title, tags, summary overlap via FTS5). Return ranked candidates with relevance indicator.

Modes

FTS5-only mode for bulk operations (cheap, fast)

LLM mode for high-value entries (if existing API endpoint uses LLM)

Impacted Files

`pyrite/cli/link_commands.py` — add `suggest` subcommand

`pyrite/server/endpoints/ai_ep.py` — existing API logic to reuse

May need to extract shared logic into a service

Acceptance Criteria

CLI command wraps existing API suggest-links logic

FTS5-only mode available for bulk use

JSON output for agent consumption

Cross-KB suggestion supported via `--target-kb`

CLI link suggest command (pyrite link suggest)backlog_item