Get Started: Teecryptor decrypts, not the Threshold Network

[haimbj1]

DOC-63.

what-is-cofhe.mdx is the first architecture description a new developer reads.
It said the Threshold Network decrypts results today. Teecryptor does.
The Threshold Network is a future plan only, so it is gone from this page.

PR #43 fixed the Deep Dive tab and the component table on this page. The prose
was never rescoped. This is the Get Started half.

Decryption path

• The Decrypt step now names Teecryptor: it checks the ACP against the onchain
  access list, then seals the value or returns a signed plaintext.
• "Trust-minimized by default" now says what makes it true: the key is split
  into shares held by independent partners, each partner releases its share only
  to an attested Teecryptor enclave, and the key is reassembled in memory only.
  Sourced from the key management page.
• The two "How CoFHE keeps data safe" bullets now describe the commitment check
  and the ACP gate, both by Teecryptor.

Terminology, after the Deep Dive merge

• "CoFHE server" is now the compute pipeline, linked to its new page. The
  compute step also credits the FHE Engine for the math, not the pipeline.
• Task Manager renamed to TaskManager, per the terminology table.

While in the file

Cleared the legacy linter debt on the page: two uses of "just", two sentences
over 30 words, and an em dash in the Mermaid note.

Checks

scripts/lint-docs.py, vale, and scripts/check-versions.py --docs all clean.

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