docs(design): propose free trial credits at signup

[mmabrouk]

Problem

A new signup lands in the playground, describes their agent, commits it, and then hits a wall: the composer disables and a banner demands an LLM provider API key before their first message sends. The user does the work and gets none of the payoff.

What this PR contains

A full design workspace under docs/design/activation-credits/, in reading order:

• context.md — the situation today, goals, constraints, and a glossary defining every term.
• rfc.md — the decisions requested (D1-D8), including a smallest safe version that strips the hardening items, so scope can be cut deliberately.
• design.md — the full architecture: signup grant record, reservation with atomic charge, server-side funding provenance, and a small in-house inference gateway (the platform key never enters the user-controlled sandbox), composed with the Daytona secret-delivery work (docs(agent-workflows): Plan Daytona secret delivery #5223/[feat] Deliver agent credentials through Daytona Secrets #5277/[docs] Plan durable managed-resource reconciliation #5278).
• research.md — the evidence: current key-gate mechanics, PR [chore] Limit usage of agenta provided keys via credits #2957 prior art, the entitlements engine, measured activation token costs from production traces (~23.6K tokens of harness context per LLM call), model pricing and abuse math, anonymized competitor free-tier patterns, the Daytona-secrets possession-vs-usage analysis, and the gateway build-vs-adopt survey.
• implicit-decisions.md — a register of every requirement that entered the design beyond the original ask (own inference, review-forced, or codebase constraint), each with the cost of striking it. Read this to cut scope.

Review

Mahmoud is the reviewer. An external model review loop was used as a helper during drafting; its accreted requirements are itemized in implicit-decisions.md rather than baked in silently. Do not merge; that call is Mahmoud's.

https://claude.ai/code/session_013PybmGbRaSiFzFtzhCrESm

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Ready	Preview, Comment	Jul 23, 2026 2:30pm

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[mmabrouk]

Tracked in #5506.

[mmabrouk]

Tracked in #5506.