docs: sync documentation with recent main merges

docs/features/a2a/index.md

@@ -38,6 +38,7 @@ $ docker agent serve a2a agentcatalog/pirate
 | --------------------------------- | ---------------- | -------------------------------------------------------------------------------------------------------------------- |
 | `-l, --listen <addr>`             | `127.0.0.1:8082` | Address to listen on.                                                                                                |
 | `-a, --agent <name>`              | (first agent)    | Name of the agent to expose when the config contains multiple agents. Defaults to the team's first agent.            |
+| `-s, --session-db <path>`         | `<data-dir>/session.db` | Path to the SQLite session database.                                                                          |
 | `--working-dir <path>`            | current dir      | Working directory the agent runs in.                                                                                 |
 | `--env-from-file <file>`          | (none)           | Load additional environment variables from a `.env` file (repeatable).                                               |
 | `--models-gateway <url>`          | (none)           | Route all provider traffic through a models gateway URL.                                                             |

docs/features/board/index.md

@@ -25,6 +25,11 @@ Requirements: `tmux` and `git` must be installed.
   a dedicated tmux session, working in a fresh git worktree branched from the
   project's upstream default branch. The card's title, running/idle status,
   and failures are mirrored live from the agent's control plane.
+- **Startup phases.** While an agent is coming up its card moves through three
+  intermediate statuses before reaching **running**: `starting` (tmux session
+  created, process booting, no worktree yet) → `loading` (worktree present;
+  agent loading config, models, and tools) → `attaching` (control-plane socket
+  bound; board waiting for the first snapshot).
 - **Columns are a pipeline.** The default pipeline is
   Dev → Review → Push → Done. Moving a card forward (`]`)
   sends the destination column's prompt to the card's agent; moving it back

docs/features/tui/index.md

@@ -77,6 +77,7 @@ Type `/` during a session to see available commands, or press <kbd>Ctrl</kbd>+<k
 | `/sessions`        | Browse and load past sessions                                                        |
 | `/model`           | Change the model for the current agent                                               |
 | `/effort`          | Set the current model's reasoning-effort level (`/effort <none\|minimal\|low\|medium\|high\|xhigh\|max>`, or `/effort` alone to pick from the supported levels; reasoning models only) |
+| `/custom`          | Customize the TUI layout: sidebar position and visible sidebar sections              |
 | `/theme`           | Change the color theme                                                               |
 | `/yolo`            | Toggle automatic tool call approval                                                  |
 | `/title`           | Set or regenerate session title                                                      |