Add chatbotlight/chatbotprofile and lightweight chatbot runtime profiles

[nmaguiar]

Motivation

• Provide a constrained chatbot runtime for small/very-small models to improve reliability by reducing action complexity and retry budgets.
• Expose runtime knobs so callers can opt into lightweight behavior and pick a profile (default, small, tiny).
• Offer a convenient preset for small-model chatbot usage to simplify configuration.

Description

• Added new CLI/config options and docs entries: chatbotlight and chatbotprofile in README.md, USAGE.md, mini-a.yaml, mini-a-web.yaml, mini-a-con.js, and mini-a.js plus UI/job schema updates.
• Introduced chatbot-lite mode in mini-a-modes.yaml that sets chatbotmode=true chatbotlight=true chatbotprofile=small promptprofile=minimal and related defaults.
• Implemented MiniA.prototype._resolveChatbotRuntimeProfile in mini-a.js to map profiles to runtime constraints (constrainedActions, allowActionArrays, includeToolDetails, maxRepairRetries, maxActionEntries, defaultMaxSteps).
• Updated system/chatbot prompts to surface a LIGHTWEIGHT MODE section when constrained, added conditional multi-action guidance, and wired profile attributes into chatbot initialization and step handling (max steps, truncating actionEntries, repair-loop counting via chatbotRepairCount, and a queueRepairPrompt helper).

Testing

• No automated tests were executed as part of this change.