docs(m164): changelog — metered runs are priced from the catalogue

[indykish]

Changelog entry for M164_001, which deletes the free trial and prices metered runs from the model catalogue.

A promotional window sat in front of every price: a per-tenant timestamp, nullable with no default, whose only writer was a test fixture. Null read as "the window is open", so every account held null and every metered stage priced to zero for the whole life of the account.

What the entry covers

• Breaking — GET /v1/tenants/me/billing no longer returns free_trial. The bullet lists all four surviving members (balance_nanos, updated_at, is_exhausted, exhausted_at); it previously omitted updated_at, which the handler does emit.
• A metered platform stage is charged the catalogue rate, instead of resolving to zero.
• An unpriced model is refused rather than run for nothing.
• The budget gates can refuse a fleet — while every charge was zero, no budget was ever consumed.
• The free trial is named early access — the pricing card reads "Early access", and the pricing answer no longer says metering begins "after the trial". Free usage is the starter grant, which ends when the balance does rather than on a date.
• Deleting a fleet erases its memory — memory.memory_entries rows are removed with their fleet.

Product side: agentsfleet PR for feat/m164-delete-the-free-trial.

🤖 Generated with Claude Code

Greptile Summary

This PR adds the Aug 13, 2026 changelog entry for the removal of the free-trial mechanism.

• Documents removal of free_trial from the tenant billing response.
• Explains catalogue-based metered pricing, refusal of unpriced models, and effective budget enforcement.
• Renames the promotional terminology to early access and records fleet-memory cleanup on deletion.

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The new dated entry clearly supersedes earlier historical billing behavior, and its current pricing and fleet-deletion claims are consistent with the repository’s active documentation.

Important Files Changed

Filename	Overview
changelog.mdx	Adds a coherent release entry covering the billing API break, corrected metered pricing, budget behavior, terminology, and fleet-memory deletion.

_{Reviews (1): Last reviewed commit: "docs(m164): name early access in the cha..." | Re-trigger Greptile}

Context used:

• Knowledge Base — Onboarding: landing page, quickstart, changelog, and memory