Describe security subscription as purchase

[maximelb]

Describe extension subscription as the purchase for Email and Code Security. Explain automatic paid coverage when subscribed off the free tier with a payment method or authorized invoicing, the 14-day free-tier trial and unchanged daily rates, unsubscribe/free-tier stop behavior, and payment-failure grace. Remove activation, manual-stop, and quote-acceptance instructions from billing and the Email/Code setup pages; retain read-only status documentation.

Clarify that usage under trial coverage is free. Acknowledged paid coverage starts billing even if the original trial deadline is later. Trial history remains unchanged, and returning to the free tier while subscribed can resume remaining original trial coverage. Earlier trial-only days are not billed retroactively.

Validation: strict MkDocs build; ordered-list numbering, release-note headings, and all nine release feeds checked successfully. Self-review found no remaining billing activation or quote sections, no guaranteed 14-calendar-day paid billing holiday, and no private names or links added.

Leave unmerged for orchestrator review.

[maximelb]

/lc-review

[limacharlie-refractionpoint]

LimaCharlie Cloud Security — code scan

No new code findings were introduced by this pull request.

This check reports and never fails: no gating.fail_on is set on the code_scanning policy.

Scanned refractionPOINT/documentation 3da7c3a…09d4036 — only findings new in the head commit are listed; anything already on the base branch is the repository's own finding set, on the Cloud Security Code page.

This comment is updated in place on every push to this pull request.

[maximelb]

/lc-review

[maximelb]

Superseded by #489, which documents GA availability, subscription-as-purchase billing, and the verified free-tier trials. Closing this older PR to keep one documentation change for review.