SMOODEV-2610: th knowledge — top-level command + semantic search

[brentrager]

What

th knowledge search "<query>" runs the same semantic retrieval an agent does over the org's own knowledge base (embed → dense+sparse hybrid → RRF), returning the most relevant passages. It's the missing agentic-coding primitive next to th search (the web) and th crawl (a page) — now an agent (or you) can ask "what does our knowledge base say about X" from the CLI.

th knowledge search "how does billing work"
th knowledge search "refund policy" --doc <id>      # scope to one document
th knowledge search "pricing" --max 8 --json

Also promotes the full knowledge surface to top-level th knowledge (alias kb) — list / show / content / upload / website / process / update / delete — same commands as th api knowledge, consistent with how th booking / th files / th org were promoted.

Backend

Backed by the new authed POST /organizations/:org_id/knowledge/search endpoint (smooai #3002, SMOODEV-2610). The endpoint and the agent's in-process knowledge_search tool call one shared Rust crate, so th and the agent can never return different results. Authed only — knowledge is org-private.

Verify

th knowledge --help          # search + full CRUD, top-level
th knowledge search --help   # <QUERY>, --doc, --max, --json
th --help                    # 'knowledge' listed (alias kb)

Changeset: @smooai/smooth minor.

Jira: SMOODEV-2610

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Latest commit: 4a0b312

The changes in this PR will be included in the next version bump.

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Name	Type
@smooai/smooth	Minor

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