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the install as outdated instead of masking a hook grok never invokes.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

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

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