algos,aictx: Impl aictx LLM context CLI and algos gym; move legacy mycli to Dotfiles

[Unique-Divine]

Summary

This PR turns the repo into more of a focused dev tooling + practice monorepo:

1. Adds aictx, a small Unix-style CLI for stitching files into LLM-friendly context.
2. Introduces an algos Go module with DFS and array problems plus structured notes.
3. Refreshes the root README to reflect the current tools and their status.
4. Removes the old Bash-based mycli/ud.sh now that the CLI has moved into dotfiles.

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Commits

• ai-gym: init project with README
• algos: work on DFS and stacks in Go
• algos(dfs): recursive and iterative solution to a problem in Go
• mycli: remove -cover flags from go test commands to speed them up
• mycli: add notes, todo, and out subcommands to 'ud quick', mirroring the old implementation
• algos: Use more concise heading prefix for problems so that the TOC won't be as long
• algos: document a few fundamental patterns to go through
• dotfiles: document --help flags and commands across CLI
• dotfiles(ud.sh): Write ud_test.sh -> ud_test.go for Go's test utilities
• dotfiles(ud.sh): Add ud nibi cfg command and test target; clarify install description
• dotfiles: fix tests and complete migration from bash to Go
• dotfiles: Add RPC vars and implement full network config handling in ud nibi cfg; bump nibid installer version
• dotfiles: Remove "mycli" dir, as this tool is now part of the Unique-Divine/dotfiles repo
• algos: mine flood fill DFS problem for Anki
• algos: Record notes for new Anki cards; add content on Go slice implementation in the "runtime" package.
• algos: 001 - impl Go two sum solution
• algos: 001 add two sum problem statement
• algos: notes on a few array problems
• algos: impl 002 remove element solution
• algos: impl 003 - Move Zeros solution
• algos: add problem 4 description
• algos: Fix in tests for 000 to prevent reuse of tc.imgIn, which is modified in place by the recursive DFS function
• aictx: impl simple Unix-like CLI tool for building up context for LLMs