feat: add pane navigation controls

refs #421

refs #330

related discussions:

https://github.com/ogulcancelik/herdr/discussions/422

https://github.com/ogulcancelik/herdr/discussions/438

https://github.com/ogulcancelik/herdr/discussions/442

5 files changed, 57 insertions, 3 deletions

diff --git a/docs/next/CHANGELOG.md b/docs/next/CHANGELOG.md
index f0aeda9d..764043fd 100644
--- a/docs/next/CHANGELOG.md
+++ b/docs/next/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 ### Added
 - Added `herdr integration install droid` for Factory Droid hooks that report session ids through Herdr's socket API. When native agent session restore is enabled, Herdr can resume Droid panes with `droid --resume <id>`.
+- Added directional pane swap with `prefix+shift+h/j/k/l`, a pane context-menu swap action, pane layout/neighbor/edge/focus/resize socket APIs, matching CLI commands, and optional `pane split --ratio` support.
 
 ## [0.6.8] - 2026-06-04
 
diff --git a/docs/next/README.md b/docs/next/README.md
index e15162ad..2523d61c 100644
--- a/docs/next/README.md
+++ b/docs/next/README.md
@@ -225,6 +225,7 @@ Press `ctrl+b` to enter prefix mode. Default actions are prefix-first and tmux-l
 | `prefix+shift+w` | rename workspace |
 | `prefix+shift+d` | close workspace |
 | `prefix+h/j/k/l` | focus pane |
+| `prefix+shift+h/j/k/l` | swap pane |
 | `prefix+v` / `prefix+minus` | split pane |
 | `prefix+x` | close pane |
 | `prefix+b` | toggle sidebar |
diff --git a/docs/next/website/src/content/docs/cli-reference.mdx b/docs/next/website/src/content/docs/cli-reference.mdx
index bf3c37d3..8d983dcf 100644
--- a/docs/next/website/src/content/docs/cli-reference.mdx
+++ b/docs/next/website/src/content/docs/cli-reference.mdx
@@ -100,8 +100,15 @@ herdr tab close <tab_id>
 ```bash
 herdr pane list [--workspace <workspace_id>]
 herdr pane get <pane_id>
+herdr pane layout [--pane ID|--current]
+herdr pane neighbor --direction left|right|up|down [--pane ID|--current]
+herdr pane edges [--pane ID|--current]
+herdr pane focus --direction left|right|up|down [--pane ID|--current]
+herdr pane resize --direction left|right|up|down [--amount FLOAT] [--pane ID|--current]
 herdr pane rename <pane_id> <label>|--clear
-herdr pane split <pane_id> --direction right|down [--cwd PATH] [--focus] [--no-focus]
+herdr pane split [<pane_id>|--pane ID|--current] --direction right|down [--ratio FLOAT] [--cwd PATH] [--focus] [--no-focus]
+herdr pane swap --direction left|right|up|down [--pane ID|--current]
+herdr pane swap --source-pane ID --target-pane ID
 herdr pane close <pane_id>
 ```
 
diff --git a/docs/next/website/src/content/docs/configuration.mdx b/docs/next/website/src/content/docs/configuration.mdx
index f2159950..1cabdd51 100644
--- a/docs/next/website/src/content/docs/configuration.mdx
+++ b/docs/next/website/src/content/docs/configuration.mdx
@@ -160,6 +160,10 @@ focus_pane_left = "prefix+h"
 focus_pane_down = "prefix+j"
 focus_pane_up = "prefix+k"
 focus_pane_right = "prefix+l"
+swap_pane_left = "prefix+shift+h"
+swap_pane_down = "prefix+shift+j"
+swap_pane_up = "prefix+shift+k"
+swap_pane_right = "prefix+shift+l"
 cycle_pane_next = "prefix+tab"
 cycle_pane_previous = "prefix+shift+tab"
 last_pane = ""
diff --git a/docs/next/website/src/content/docs/socket-api.mdx b/docs/next/website/src/content/docs/socket-api.mdx
index 9d9791e7..2cdc6cc9 100644
--- a/docs/next/website/src/content/docs/socket-api.mdx
+++ b/docs/next/website/src/content/docs/socket-api.mdx
@@ -23,7 +23,7 @@ The socket API can:
 
 - create, list, focus, rename, and close workspaces
 - create, list, focus, rename, and close tabs
-- list, inspect, split, rename, read, close, and send input to panes
+- list, inspect, split, swap, focus, resize, rename, read, close, and send input to panes
 - list, inspect, read, send to, rename, focus, start, and attach agents through CLI helpers
 - report custom agent state from hooks and plugins
 - subscribe to events and wait for output or state changes
@@ -51,6 +51,16 @@ herdr pane split 1-1 --direction right
 herdr pane run 1-2 "npm test"
 ```
 
+Inspect and rearrange panes:
+
+```bash
+herdr pane layout --current
+herdr pane neighbor --direction right --current
+herdr pane resize --direction right --amount 0.1 --current
+herdr pane swap --direction right --current
+herdr pane split 1-1 --direction right --ratio 0.333
+```
+
 Wait for an agent:
 
 ```bash
@@ -73,13 +83,44 @@ Raw socket method names use dot notation:
 | Workspace | `workspace.create`, `workspace.list`, `workspace.get`, `workspace.focus`, `workspace.rename`, `workspace.close` |
 | Worktree | `worktree.list`, `worktree.create`, `worktree.open`, `worktree.remove` |
 | Tab | `tab.create`, `tab.list`, `tab.get`, `tab.focus`, `tab.rename`, `tab.close` |
-| Pane | `pane.split`, `pane.list`, `pane.get`, `pane.rename`, `pane.send_text`, `pane.send_keys`, `pane.send_input`, `pane.read`, `pane.report_agent`, `pane.report_agent_session`, `pane.report_metadata`, `pane.clear_agent_authority`, `pane.release_agent`, `pane.close`, `pane.wait_for_output` |
+| Pane | `pane.split`, `pane.swap`, `pane.layout`, `pane.neighbor`, `pane.edges`, `pane.focus_direction`, `pane.resize`, `pane.list`, `pane.get`, `pane.rename`, `pane.send_text`, `pane.send_keys`, `pane.send_input`, `pane.read`, `pane.report_agent`, `pane.report_agent_session`, `pane.report_metadata`, `pane.clear_agent_authority`, `pane.release_agent`, `pane.close`, `pane.wait_for_output` |
 | Agent | `agent.list`, `agent.get`, `agent.read`, `agent.send`, `agent.rename`, `agent.focus`, `agent.start` |
 | Events | `events.subscribe`, `events.wait` |
 | Integrations | `integration.install`, `integration.uninstall` |
 
 Some CLI commands are conveniences around these methods. For example, `herdr agent wait` resolves an agent target and then subscribes to pane agent state events.
 
+Pane control methods use public pane ids such as `1-1`. Omit `pane_id` to use
+the server's active focused pane.
+
+```json
+{"id":"req_layout","method":"pane.layout","params":{"pane_id":"1-1"}}
+{"id":"req_neighbor","method":"pane.neighbor","params":{"pane_id":"1-1","direction":"right"}}
+{"id":"req_edges","method":"pane.edges","params":{"pane_id":"1-1"}}
+{"id":"req_focus","method":"pane.focus_direction","params":{"direction":"right"}}
+{"id":"req_resize","method":"pane.resize","params":{"pane_id":"1-1","direction":"right","amount":0.1}}
+{"id":"req_split","method":"pane.split","params":{"direction":"right","ratio":0.333}}
+```
+
+`pane.layout` returns the tab layout snapshot with `workspace_id`, `tab_id`,
+`zoomed`, outer `area`, `focused_pane_id`, pane rects, and split rects/ratios.
+`pane.neighbor` and `pane.edges` include that same layout snapshot so clients
+can make the next decision without private layout state.
+
+`pane.swap` supports directional and explicit forms:
+
+```json
+{"id":"req_swap_dir","method":"pane.swap","params":{"pane_id":"1-1","direction":"right"}}
+{"id":"req_swap_explicit","method":"pane.swap","params":{"source_pane_id":"1-1","target_pane_id":"1-2"}}
+```
+
+Swap is same-tab only. It preserves split shape, split ratios, pane ids, and
+running processes. The response is `type: "pane_swap"` with `changed`, optional
+`reason`, `source_pane_id`, optional `target_pane_id`, `focused_pane_id`, and
+`layout`. Reason values are `no_neighbor`, `same_pane`, `not_found`, and
+`cross_tab`. When a tab is zoomed, swap keeps zoom active and mutates the hidden
+full-tab layout.
+
 Worktree methods manage Git checkouts as Herdr workspaces. `worktree.create` creates a checkout and returns the new `workspace`, `tab`, `root_pane`, and `worktree` records. `worktree.open` opens an existing checkout or returns the already-open workspace. `worktree.remove` runs `git worktree remove` against a linked child workspace and never deletes the branch.
 
 Create a worktree from a source workspace: