[codex] add Crestodian plugin management (#75869)

Summary:
- The branch adds ClawHub plugin search and Crestodian plugin list/search/install/uninstall flows, with docs, changelog, tests, runtime injection, and regenerated config baseline hashes.
- Reproducibility: not applicable. as a bug reproduction request. The high-confidence verification path is cur ... surface search plus exact-head diff/source inspection against the PR's targeted tests and queued CI checks.

ClawSweeper fixups:
- Included follow-up commit: Repair Crestodian plugin management config schema drift

Validation:
- ClawSweeper review passed for head c29cda6005.
- Required merge gates passed before the squash merge.

Prepared head SHA: c29cda6005
Review: https://github.com/openclaw/openclaw/pull/75869#issuecomment-4362360704

Co-authored-by: Peter Steinberger <steipete@gmail.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

docs/cli/crestodian.md

@@ -71,6 +71,10 @@ agents
 create agent work workspace ~/Projects/work
 models
 set default model openai/gpt-5.5
+plugins list
+plugins search slack
+plugin install clawhub:openclaw-codex-app-server
+plugin uninstall openclaw-codex-app-server
 talk to work agent
 talk to agent for ~/Projects/work
 audit
@@ -99,6 +103,8 @@ Read-only operations can run immediately:
 
 - show overview
 - list agents
+- list installed plugins
+- search ClawHub plugins
 - show model/backend status
 - run status or health checks
 - check Gateway reachability
@@ -116,6 +122,8 @@ you pass `--yes` for a direct command:
 - change the default model
 - start, stop, or restart the Gateway
 - create agents
+- install plugins from ClawHub or npm
+- uninstall plugins
 - run doctor repairs that rewrite config or state
 
 Applied writes are recorded in:
@@ -240,6 +248,9 @@ Security contract for remote rescue:
 - Require an explicit owner identity. Rescue must not accept wildcard sender
   rules, open group policy, unauthenticated webhooks, or anonymous channels.
 - Owner DMs only by default. Group/channel rescue requires explicit opt-in.
+- Plugin search and list are read-only. Plugin install is local-only by default
+  because it downloads executable code. Plugin uninstall can be allowed as an
+  approved repair operation when rescue policy permits persistent writes.
 - Remote rescue cannot open the local TUI or switch into an interactive agent
   session. Use local `openclaw` for agent handoff.
 - Persistent writes still require approval, even in rescue mode.