feat(tui): /study slash command to prime the agent on the current project

New built-in /study command that runs a single canned prompt:
"Read and understand everything in the current directory." The
first thing most sessions need is project context, and typing
the full sentence every time is friction; /study turns that
into one keystroke-saving shortcut.

Dispatched through the same queue-or-start path as a typed
prompt, so it behaves identically:

  - idle  -> startTurn(studyPrompt)
  - busy  -> queued behind the running turn, delivered next

Also added to the README slash-commands table so /help output
and the top-level docs stay in sync with slashCatalog.

README.md

@@ -187,6 +187,7 @@ Type `/` in the TUI to open the autocomplete popup. Available commands:
 | `/btw` | Side chat with full context that doesn't add to the main thread. |
 | `/skills` | List discovered skills (SKILL.md files) and preview their bodies. |
 | `/compact` | Summarize the transcript into one message to free up context. |
+| `/study` | Run the canned prompt "Read and understand everything in the current directory." so the agent has full project context before you start asking targeted questions. |
 | `/jail` | Confine tools to the current directory. |
 | `/unjail` | Allow tools to touch paths outside again. |
 | `/reload-ext` | Hot-reload all extensions (re-read manifests, respawn subprocesses, rebuild tool registry). |

internal/agent/modes/interactive.go

@@ -1452,6 +1452,22 @@ func (i *Interactive) runSlash(ctx context.Context, cmd string) (done bool) {
 		i.openSkillsDialog()
 	case "/compact":
 		i.runCompact(ctx, false)
+	case "/study":
+		// Canned prompt that tells the agent to read every file
+		// in the current directory so its later turns have the
+		// whole project in context. Dispatched through the normal
+		// queue-or-start path so it behaves identically to
+		// typing the prompt by hand.
+		const studyPrompt = "Read and understand everything in the current directory."
+		i.mu.Lock()
+		if i.busy {
+			i.queued = append(i.queued, studyPrompt)
+			i.mu.Unlock()
+			i.invalidate()
+			break
+		}
+		i.mu.Unlock()
+		i.startTurn(ctx, studyPrompt)
 	case "/jail":
 		if i.cfg.Sandbox == nil {
 			i.mu.Lock()

internal/agent/modes/slash_suggest.go

@@ -40,6 +40,7 @@ var slashCatalog = []slashCommand{
 	{Name: "/session", Desc: "export the current session to a .zotsession file, or import one"},
 	{Name: "/jump", Desc: "scroll the chat to a previous turn (or /jump <text>)"},
 	{Name: "/compact", Desc: "summarize and replace the transcript to free up context"},
+	{Name: "/study", Desc: "read every file in the current directory so the agent has full project context"},
 	{Name: "/btw", Desc: "side-chat that doesn't add to the main thread (saves tokens)"},
 	{Name: "/jail", Desc: "confine tools to the current directory"},
 	{Name: "/skills", Desc: "list discovered skills (SKILL.md files)"},