Update README: new primitives, fetch/pick, BBS::Color

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -49,22 +49,45 @@ The entire dialogue is defined as a declarative `BBS::Flow.define` block.
 
 ### Primitives
 
+#### Output
+
 | Primitive | Description |
 |---|---|
 | `screen :name, **vars` | Render an ERB screen from `screens/`; vars override/extend the context |
 | `banner "text", style:` | Print a box-drawing ASCII banner |
 | `big_banner "text", style:, font:` | Print a large FIGlet ASCII-art banner (default font: `slant`) |
 | `say "text", style:` | Print a single styled line |
+| `text "content", style:` | Print a line; accepts a block `{ \|ctx\| string }` for dynamic content |
+| `section "title", color:` | Print a decorated section header with box-drawing |
+| `line color:` | Print a horizontal rule |
+| `rows(empty: "…") { \|ctx\| array }` | Print a list of lines; shows `empty` when the array is empty |
+| `table { \|ctx\| hash }` | Print a two-column key/value table |
+| `body(width:, indent:) { \|ctx\| string }` | Word-wrap and print a block of text (strips basic Markdown) |
+| `output { \|ctx\| string }` | Write a raw string returned by the block verbatim |
+
+#### Input & control
+
+| Primitive | Description |
+|---|---|
 | `ask :field, prompt:, transform:, validate:` | Read input and store it in the session context |
 | `set :field, value` | Set a context variable directly from code |
 | `persist :field, …, store:` | Write named context fields to a `BBS::Store` |
 | `pause "message", seconds:` | Display a message and sleep |
+| `wait_enter prompt:` | Print a prompt and block until the user presses Enter |
 | `gate denied: "…" { \|ctx\| bool }` | Halt the flow unless the block returns true |
 | `confirm "message", denied: "…"` | Yes/no gate — halts on no |
 | `confirm "message", denied: "…" { }` | Yes/no branch — runs the block on yes, skips on no |
+| `call { \|ctx\| }` | Run an arbitrary block; return `:halt` to end the session |
 | `menu "prompt", loop: bool { }` | Numbered option menu; loops back after each selection when `loop: true` |
 | `exit_menu` | Break out of the enclosing `menu` loop and continue the parent flow |
 
+#### Data fetching
+
+| Primitive | Description |
+|---|---|
+| `fetch :key, loading: "…" { \|ctx\| value }` | Show a loading message, call the block, store the result in `ctx[:key]`, erase the loading line |
+| `pick from:, prompt:, empty:, item:, hint: { sub-flow }` | Show a numbered list from `ctx[from]`; on selection stores the item in `ctx[:picked]` and runs the sub-flow |
+
 ### `ask` options
 
 | Option | Description |
@@ -77,6 +100,28 @@ The entire dialogue is defined as a declarative `BBS::Flow.define` block.
 
 `:success`, `:info`, `:error`, `:warning`, `:muted` — each maps to an ANSI colour.
 
+### `fetch` + `pick` example
+
+```ruby
+option 'Blog Posts' do
+  section 'Blog Posts', color: :blue
+  fetch :pages, loading: 'Loading...' do |ctx|
+    WIKI.list('blog')
+  end
+  pick from: :pages,
+       empty: 'No results.',
+       prompt: 'Enter number to read (blank to go back)',
+       item:  ->(p, i) { "#{i}. #{p.title}" },
+       hint:  ->(p, i) { p.description.to_s[0...65] } do
+    fetch :body, loading: 'Loading page...' do |ctx|
+      WIKI.content(ctx[:picked].id)
+    end
+    body { |ctx| ctx[:body] }
+    wait_enter
+  end
+end
+```
+
 ### Menu example
 
 ```ruby
@@ -123,6 +168,22 @@ persist :email,       store: signups
 
 Rows are keyed by `session_id`: the first `persist` for a session creates the row; subsequent ones update it in place.
 
+## Colors
+
+`BBS::Color` is a `module_function` module you can `include` to get the `c` helper anywhere — top-level, inside lambdas, and inside `instance_eval` blocks.
+
+```ruby
+include BBS::Color
+
+c(:green,  "[▶ Play]")      # => "\e[1;32m[▶ Play]\e[0m"
+c(:gray,   "some text")
+c(:yellow, msg.timestamp)
+```
+
+Available color symbols: `:reset`, `:gray`, `:yellow`, `:white`, `:blue`, `:cyan`, `:green`, `:magenta`, `:red`.
+
+Raises `KeyError` on unknown symbols.
+
 ## Architecture
 
 | File | Responsibility |
@@ -132,6 +193,7 @@ Rows are keyed by `session_id`: the first `persist` for a session creates the ro
 | `bbs/telnet.rb` | Telnet protocol (IAC handling, echo control, readline) |
 | `bbs/flow.rb` | Flow DSL builder |
 | `bbs/flow_runner.rb` | Executes a Flow step by step against a session context |
+| `bbs/color.rb` | `BBS::Color` module with ANSI color map and `c()` helper |
 | `bbs/config.rb` | Configuration object |
 | `bbs/banner.rb` | Box-drawing and FIGlet banner renderer |
 | `bbs/renderer.rb` | ERB screen loader with ANSI colour helpers |