feat: add grok cli integration for native session restore (#1807)

* feat: add grok cli integration for native session restore

tl;dr: adds `herdr integration install grok` (session-identity tier: a
SessionStart hook reports the grok session id for native restore; state
stays screen-detected via the bundled manifest).

Grok merges every ~/.grok/hooks/*.json, so install writes a
self-contained hooks/herdr.json registering a SessionStart hook next to
hooks/herdr-agent-state.sh, and never touches other hook files. The hook
prefers $GROK_SESSION_ID (injected into every grok hook process) and
reports through the socket API; herdr:grok is a reserved-native-state
source so screen detection stays authoritative. Restore uses
`grok --resume <id>`. Additive JSON API change; no protocol bump; the
schema artifact is regenerated.

refs #1800

* fix: honor GROK_HOME and validate grok hook config in status

Review follow-ups: grok_dir now resolves GROK_CONFIG_DIR (herdr test
seam) before GROK_HOME (the grok CLI's own config-home override) before
~/.grok, so hook installs land where grok actually looks. Integration
status now also validates the herdr-owned hooks/herdr.json next to the
hook script — missing, corrupt, or no-longer-referencing configs report
the install as outdated instead of masking a hook grok never invokes.

refs #1800

* fix: validate the exact grok session hook command in status

The config validator matched on a filename substring, so a SessionStart
command like `echo herdr-agent-state.sh`, or one invoking the script
without the `session` action, still reported the integration as current
while grok never delivered a session id. Status now compares against the
exact command the installer writes, via a shared builder, and the
degradation tests cover both nonfunctional shapes.

refs #1800

* fix: require a command-type grok session hook in status validation

A config entry carrying the exact generated command under a non-command
hook type (e.g. "http") is never executed by grok, so it must not report
the integration as current. The validator now also requires
type = "command", with a degradation test for the mismatched-type shape.

refs #1800

* fix: validate the complete grok hook config

refs #1800

---------

Co-authored-by: Ogulcan Celik <ogulcancelik@gmail.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/src/cli/integration.rs b/src/cli/integration.rs
index c407278e..265bbf95 100644
--- a/src/cli/integration.rs
+++ b/src/cli/integration.rs
@@ -103,13 +103,13 @@ fn parse_integration_target(
 ) -> std::io::Result<Option<IntegrationTarget>> {
     let Some(target) = args.first().map(|arg| arg.as_str()) else {
         eprintln!(
-            "usage: herdr integration {action} <pi|omp|claude|codex|copilot|devin|droid|kimi|opencode|kilo|hermes|qodercli|cursor|mastracode>"
+            "usage: herdr integration {action} <pi|omp|claude|codex|copilot|devin|droid|kimi|opencode|kilo|hermes|qodercli|cursor|mastracode|grok>"
         );
         return Ok(None);
     };
     if args.len() != 1 {
         eprintln!(
-            "usage: herdr integration {action} <pi|omp|claude|codex|copilot|devin|droid|kimi|opencode|kilo|hermes|qodercli|cursor|mastracode>"
+            "usage: herdr integration {action} <pi|omp|claude|codex|copilot|devin|droid|kimi|opencode|kilo|hermes|qodercli|cursor|mastracode|grok>"
         );
         return Ok(None);
     }
@@ -129,10 +129,11 @@ fn parse_integration_target(
         "qodercli" => IntegrationTarget::Qodercli,
         "cursor" => IntegrationTarget::Cursor,
         "mastracode" => IntegrationTarget::Mastracode,
+        "grok" => IntegrationTarget::Grok,
         _ => {
             eprintln!("unknown integration target: {target}");
             eprintln!(
-                "currently supported: pi, omp, claude, codex, copilot, devin, droid, kimi, opencode, kilo, hermes, qodercli, cursor, mastracode"
+                "currently supported: pi, omp, claude, codex, copilot, devin, droid, kimi, opencode, kilo, hermes, qodercli, cursor, mastracode, grok"
             );
             return Ok(None);
         }
@@ -157,6 +158,7 @@ fn print_integration_help() {
     eprintln!("  herdr integration install qodercli");
     eprintln!("  herdr integration install cursor");
     eprintln!("  herdr integration install mastracode");
+    eprintln!("  herdr integration install grok");
     eprintln!("  herdr integration uninstall pi");
     eprintln!("  herdr integration uninstall omp");
     eprintln!("  herdr integration uninstall claude");
@@ -171,5 +173,6 @@ fn print_integration_help() {
     eprintln!("  herdr integration uninstall qodercli");
     eprintln!("  herdr integration uninstall cursor");
     eprintln!("  herdr integration uninstall mastracode");
+    eprintln!("  herdr integration uninstall grok");
     eprintln!("  herdr integration status [--outdated-only]");
 }