v0.2.2

Docs a newcomer reads, from a colleague's cold run through the quick start. No code changes since v0.2.1.

• Quick start matches Slack's current screens. Step 2 walks the app-creation flow as it is now (YAML tab, Create and Install, Allow, then copy the User token from "Your app credentials", not the App Token), says what a non-admin sees when the workspace restricts installs, and step 4 shows what whoami should print.
• 1Password is optional. An agent needs only SLACK_USER_TOKEN in its environment, set any way. The README and the skill's relaunch hint now lead with the quick start's own read -rs, with 1Password as one option.
• Shorter README. The credential chain moved to docs/credentials.md; output, exit codes, the audit log, and the directory cache to docs/reference.md. A new Uninstall section covers the binary, the skill, local state, and deleting the Slack app.

Install the CLI from this release: uv tool install https://github.com/facetdigital/slackline/releases/download/v0.2.2/slackline-0.2.2-py3-none-any.whl (or pipx install the same URL), or from a clone with uv tool install .. Give the skill to every session or one repo: unzip slackline-skill-0.2.2.zip into ~/.claude/skills/ or that repo's .claude/skills/.