Add interactive memory manager TUI (memoryman=true)

[nmaguiar]

Motivation

• Provide an interactive console (TUI) for operators to inspect and maintain Mini-A working memory (session + global) similar to the existing modelman and mcptest flows.
• Make it easy to list, inspect, search, selectively delete, and prune old memory entries persisted via configured memorych/memorysessionch channels.

Description

• Add mini-a-memoryman.js, a menu-driven TUI that initializes memory channels and exposes: summary dashboard, list/filter, full entry inspection, selective delete by section/id, age-based pruning (relative like 30d or absolute ISO/epoch), keyword search, maintenance actions (compact, stale sweep, clear), and snapshot export.
• Wire memoryman=true into the console startup routing so the TUI can be launched like modelman=true/mcptest=true in mini-a-con.js.
• Surface memory-related CLI parameters and examples in console parameter definitions and help text (memorych, memorysessionch, memoryuser, memoryscope, memorysessionid) and add a usage example for launching the manager.
• Register memoryman in mini-a.js known-argument list to prevent unknown-arg warnings.
• Document the feature in USAGE.md, README.md, and CHEATSHEET.md with examples and a short cheatsheet for the TUI.
• Small helper utilities included inside mini-a-memoryman.js to parse relative/absolute date inputs and format ages for pruning confirmations.

Testing

• Ran git diff --check to verify there are no whitespace/patch issues (succeeded).
• Verified presence of new/updated references with rg -n "memoryman" across mini-a-con.js, mini-a.js, README.md, USAGE.md, and CHEATSHEET.md (succeeded).
• Performed a local commit of the changes (Add interactive memory manager TUI) to record the work (succeeded).
• Note: interactive runtime checks (launching the TUI and exercising OpenAF $ch() channels via ojob/openaf) could not be run in this environment because ojob/openaf were not available; manual/CI runtime validation is recommended when running on a system with OpenAF tools available.