Wire remaining REPL commands into codegraff TUI handle_enter

[justrach]

Why

The graff REPL (crates/forge_main/) recognises 25+ slash commands via ForgeCommandManager::parse (crates/forge_main/src/model.rs:285). The codegraff TUI dispatcher (handle_enter in crates/codegraff-tui/src/main.rs) currently routes only 8 of them locally (/connect, /image, /login, /logs, /model, /models, /usage, /workflow). Everything else falls through to spawn_chat, which sends the literal slash text to the LLM as a user message — broken UX.

This came up during pre-merge review of #21 (slash command palette). The palette was originally going to expose the full command catalogue, but cross-referencing with handle_enter showed ~30 ghost commands. The palette has since been restricted to the 8 working commands; this issue tracks closing the parity gap.

What

For each command below, add a branch in handle_enter that:

1. Parses any args from the slash text
2. Calls the appropriate forge_app / forge_api API
3. Renders the result in the TUI (transcript, overlay, or status line as appropriate)
4. Closes the composer

Commands to wire (priority order)

Tier 1 — most-used, smallest dispatch:

• /new — start a new conversation (preserve history)
• /info — system information
• /help — help mode
• /exit — quit codegraff (today users use Ctrl+C; consider whether /exit should be a slash form too)

Tier 2 — agent switching:

• /act (forge agent) — implementation mode
• /plan (muse agent) — planning mode
• /sage — research mode
• /agent — interactive agent selection

Tier 3 — conversation management:

• /conversation (alias /conversations) — list conversations
• /conversation-rename
• /clone — clone current/selected
• /rename
• /dump — save conversation as JSON/HTML
• /copy — copy last response to clipboard
• /compact — compact context

Tier 4 — config:

• /config — display effective config
• /config-edit — open config file in editor
• /config-model, /config-commit-model, /config-suggest-model
• /config-reasoning-effort, /reasoning-effort
• /config-reload
• /fast — toggle Priority Processing

Tier 5 — workspace + tools:

• /workspace-sync (alias /sync)
• /workspace-status
• /workspace-info
• /workspace-init
• /index
• /skill — list skills
• /tools — list tools
• /suggest — generate shell command from natural language

Tier 6 — git:

• /commit-preview
• /commit

Tier 7 — admin:

• /logout
• /update

As each tier lands

For each command wired in handle_enter, also add it to PALETTE_COMMANDS in the same PR. The palette has a sanity test (palette_includes_locally_handled_commands) that will need updating to keep the two in sync.

Acceptance per tier

• Selecting the command from the / palette executes the documented behaviour locally (no chat-message fallthrough).
• Adding a per-command unit test in handle_enter's test module where dispatch logic is non-trivial (e.g. agent switch, dump, fast toggle).
• Updating palette_includes_locally_handled_commands to match.

Out of scope

• Reimplementing the actual command logic — most lives in forge_app already and just needs UI plumbing.
• Refactoring main.rs into a module tree (separate concern, tracked in codegraff TUI: feature parity with graff REPL + rendering polish #18).
• Subagent observability ([Feature]: Add visual TUI observability for subagents #15) — different workstream.

Related

• Add slash command (/) palette + autocomplete to codegraff TUI #17 — slash palette UX (where this gap was discovered)
• codegraff TUI: feature parity with graff REPL + rendering polish #18 — codegraff parity & polish tracker
• [Feature]: Add visual TUI observability for subagents #15 — subagent observability
• Interactive multi-turn test harness for agents #20 — interactive multi-turn test harness (will dramatically reduce the cost of verifying each tier's behaviour)

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