Add tmux-manager to Other Software

[charlie103721]

Summary

Add tmux-manager to the Other Software section.

tmux-manager is a TUI for managing tmux sessions across multiple remote servers via SSH. It is built with Go and Bubbletea, and features live session counts and YAML-based configuration.

• Entry added: Other Software section, in alphabetical order (between tinycare-tui and toxiproxy)
• Format: Matches existing list entry format exactly

🤖 Generated with Claude Code

[github-actions]

Automated Quality Checks

Required checks

❌ Repo link: missing from PR body

How to fix: Add the following to your PR description:

Forge link: https://github.com/your-org/your-project

❌ **pkg.go.dev**: missing from PR body
  > **How to fix:** Add the following to your PR description:
  > ```
pkg.go.dev: https://pkg.go.dev/github.com/your-org/your-project

❌ Go Report Card: missing from PR body

How to fix: Add the following to your PR description:

goreportcard.com: https://goreportcard.com/report/github.com/your-org/your-project

### Additional checks

⚠️ **Coverage**: missing from PR body
  > **How to fix:** Add a coverage service link to your PR description:
  > ```
Coverage: https://app.codecov.io/gh/your-org/your-project

Popular options: Codecov, Coveralls. Integrate one with your CI to track coverage automatically.

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Action needed: one or more required checks failed. Please update your PR body with the missing links and ensure the repository meets the quality standards.

These checks are automated and do not replace maintainer review. See CONTRIBUTING.md for full guidelines.

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PR Diff Validation

Content checks

✅ Files changed: only README.md
✅ Single item: one package added
✅ Link text: matches repository name
✅ Description: ends with punctuation
✅ Description tone: no promotional language detected
✅ Category size: Other Software has 74 items

Automated diff validation — does not replace maintainer review.