feat: focus product on local web dashboard

[pitimon]

Summary

• Focus the active product on a localhost browser dashboard and loopback CLI backend.
• Archive unsupported native macOS/Windows implementation, workflows, and contracts outside active build/release paths.
• Update product, security, release, and outbound-call documentation; add scope guardrail tests.

Verification

• npm run ci:local
• node --test test/web-only-product-scope.test.js
• Manual CLI server startup verified on loopback; it selected port 7681 because 7680 was already occupied.
• npm publish --dry-run succeeded.

Closes #180

[pitimon]

Verification receipt:

• Local npm run ci:local: pass.
• Hosted CI run 31249516044 passed on the exact PR head 5211a7cbb3524c687a9f5aa24a2370d9cf25dd6a: ci:local and node20-contract.
• Browser smoke test: the newly built v0.39.52 dashboard served from a loopback-only CLI on port 7690; navigation contains Tokens, Limits, Skills, Claude IP Check, and Settings only.
• npm publish --dry-run: pass.

An independent read-only review is in progress; merge remains held until its result is incorporated.