docs: update docs for --sidebar, --app-name, --disable-commands flags, OAuth meta keys rename, and hooks model_id gap

[aheritier]

Summary

Catches up /docs with user-facing changes merged in the last 36 hours.

Changes

docs/features/cli/index.md — 3 new flags documented

Added to the docker agent run flags table (alongside --lean which they complement):

Flag	Description
--sidebar	Show the sidebar in the TUI (default true; --sidebar=false hides it permanently, disabling Ctrl+B and mouse toggle)
--app-name <name>	Override the application name shown in the TUI status bar, terminal title, and /exit notifications
--disable-commands <list>	Comma-separated slash commands to hide from TUI, command palette, and editor completion. Leading slashes optional, case-insensitive.

Refs: #2917, #2914, #2913

docs/features/remote-mcp/index.md — OAuth elicitation meta key prefix corrected

The unmanaged OAuth section referenced the old cagent/ key prefix. Updated all four keys to the renamed docker-agent/ prefix per #2915:

• cagent/type → docker-agent/type
• cagent/server_url → docker-agent/server_url
• cagent/authorize_url → docker-agent/authorize_url
• cagent/state → docker-agent/state

Refs: #2915

docs/configuration/hooks/index.md — model_id added to hook payload tables

The per-event extra fields table was missing model_id for both before_llm_call and after_llm_call. Added the field and a note explaining its provider/model canonical form. This closes the docs gap explicitly flagged in #2911.

Refs: #2911

No changes needed

• docs/features/tui/index.md — does not enumerate CLI flags; no update needed.
• docs/features/mcp-mode/index.md — no stale OAuth meta key references found.
• docs/features/remote-mcp/index.md OAuth drive-flow section — already written by Extend unmanaged OAuth flow to drive code exchange in-process #2896 itself; only the key-name rename was stale.

[docker-agent]

Assessment: 🟢 APPROVE

The documentation updates look accurate and complete:

• , , flags: All three entries are correctly described, with accurate default values and behavior descriptions. The note that --sidebar=false disables both Ctrl+B and mouse toggle is consistent with the permanent-hide semantics.
• OAuth meta key rename: All 4 keys (cagent/ → docker-agent/) were updated consistently across both the table and all prose references in the unmanaged OAuth section.
• model_id in hook payload tables: Added to both before_llm_call and after_llm_call with a correct clarifying note about the provider/model canonical form.

No bugs or inaccuracies found in the changed lines.