docs: recover PR #22 updates (rewind, allow-all, rename)

[DanWahlin]

Recovers Lost Changes from PR #22

PR #22 was merged into the staged branch, which was subsequently deleted — so those changes never reached main. This PR recovers those exact changes.

Changes Recovered

• /rewind timeline picker — documented in Ch 01 (commands table) and Ch 02 (context management)
• /allow-all on|off|show — updated subcommand documentation in Ch 01
• /rename auto-generate — updated description in Ch 01
• Context management section — expanded with /new, /rewind in Ch 02
• Alphabetized command tables in Ch 01

Original PR: #22

[Copilot]

Pull request overview

Recovers documentation updates from previously-merged PR #22 that never reached main, updating the course material to reflect new/changed Copilot CLI commands and improved session/context guidance.

Changes:

• Document /rewind timeline picker and add guidance on when to use it.
• Update /allow-all documentation to include on|off|show subcommands.
• Expand session/context management docs to include /new, and update command tables accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
01-setup-and-first-steps/README.md	Updates slash-command reference tables (including /allow-all subcommands and session commands like /rewind, /new).
02-context-conversations/README.md	Expands context-management guidance and tips to include /new and /rewind, plus related best-practice updates.

Comments suppressed due to low confidence (2)

02-context-conversations/README.md:351

• In this tip, file names and commands are no longer consistently formatted as inline code: books.py, utils.py, /new, and /clear should be wrapped in backticks. Also, “Otherwise stale context…” reads like it’s missing a comma after “Otherwise,”.

> 💡 **When to use `/clear` or `/new`**: If you've been reviewing books.py and want to switch to discussing utils.py, run /new first (or /clear if you don't need the session history). Otherwise stale context from the old topic may confuse responses.

01-setup-and-first-steps/README.md:429

• The /clear description here (“abandons the current session (no history saved)”) is more specific than the earlier “Clear conversation and start fresh” description in the Essential Slash Commands table. Please make the wording consistent across the chapter (and keep punctuation consistent too—this table’s /new row ends with a period while other rows don’t).

| `/clear` | Abandons the current session (no history saved) and starts a fresh conversation |
| `/compact` | Summarize conversation to reduce context usage |
| `/context` | Show context window token usage and visualization |
| `/new` | Ends the current session (saving it to history for search/resume) and starts a fresh conversation. |
| `/resume` | Switch to a different session (optionally specify session ID) |

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