docs(readme): refresh to the full product

[servathadi]

What

Refreshes README.md to reflect the full mupot product, keeping the "pot, not the plant / zero-ops sovereign" voice. Public-repo README — substance + links, commercial-grade but accurate.

Added / expanded

• Agents-as-employees — identity, character sheet, earned-capability badges, HR-shaped employee record
• Deploy-anywhere gradient — managed CF → your CF → your VPS (workerd) → on-prem datacenter → edge, as a table with porting work + data location per tier
• GitHub-as-work-spine — the born → solved → verified → done trust loop
• Enterprise / on-prem — data never leaves, air-gap option, HR-system (Workday/SCIM) integration, git-audited
• The economy — rent agents/automations in, list yours out, settle per execution; capability earned not bought
• Lean-core / pluggable providers note (heavy engines behind the gateway, not baked in)
• Connect the agent you already have onboarding framing

Notes

• Branched off origin/main in an isolated worktree so unrelated in-progress branch work was not swept in.
• Remote was already SSH (git@github.com:Mumega-com/mupot.git); no remote change needed.

Do not merge — Kasra gates.

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