grok: fix xsearch (multi-agent web_search), pin grok-build, RTFM doc sweep

Root-caused the long-standing `ask-grok.sh xsearch` "no result (stopReason=)"
failure by reading Grok's bundled docs (~/.grok/docs/user-guide + README) instead
of probing:
- web_search runs a SEPARATE multi-agent model (grok-4.20-multi-agent), so the
  wrapper's blanket --no-subagents strangled it -> indefinite hang, 0 bytes. Scoped
  --no-subagents OFF xsearch; use --yolo (documented headless tool-run posture).
- xsearch prompt mandated X/Twitter search on every call (slow multi-agent) and the
  budget was 240s -> still timed out. Now web-primary (X only when relevant), 300s.
  Validated end-to-end through the wrapper: 23s, correct answer + 3 sources.

Model: pin -m grok-build (xAI flagship, 512k, the documented default) for the
reasoning modes (text/verify/review*) so quality is deterministic and not at the
mercy of the runtime default (this machine drifted to grok-composer-2.5-fast, a fast
Cursor coding model). xsearch + image/video keep the runtime default. Validated text
mode on grok-build (13s).

Doc accuracy (SKILL.md): corrected the model facts (default, the separate web_search
model, --effort unsupported on grok-build per supports_reasoning_effort:false);
documented the xsearch subagent exception. Fixed a stale in-script comment claiming
--rules/--disallowed-tools "tripped the CLI" (both are valid headless flags).

memory: add feedback_interview_ai_read_docs (read bundled docs / interview the model
before probing) + index; errorlog correction.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

errorlog.md

@@ -17,6 +17,16 @@ Categories (the `[type]` tag): _(none)_ = skill/command execution failure ·
 
 <!-- Append entries below this line -->
 
+2026-06-17 | GURU-5070 | grok/ask-grok.sh | [correction] blindly probed grok with slow timed runs to find the xsearch syntax instead of reading its bundled docs (~/.grok/docs/user-guide/ + README.md) / interviewing the model first; the docs gave the root cause directly (web_search=grok-4.20-multi-agent multi-agent model, killed by --no-subagents) [ctx: ref=feedback_interview_ai_read_docs]
+
+2026-06-17 | GURU-5070 | grok | grok xsearch returned no result [ctx: mode=xsearch stopReason=]
+
+2026-06-17 | GURU-5070 | grok | grok xsearch returned no result [ctx: mode=xsearch stopReason=]
+
+2026-06-17 | GURU-5070 | grok/xsearch | xsearch returned empty (stopReason finalization quirk) on Grok-co-work research; fell back to text-mode design + Claude synthesis [ctx: topic=grok-as-claude-cowork]
+
+2026-06-17 | GURU-5070 | grok | grok xsearch returned no result [ctx: mode=xsearch stopReason=]
+
 2026-06-17 | GURU-5070 | syncro/customer-comment | [friction] posted a customer-facing emailed comment to #32333 WITHOUT previewing for human review first; preview-before-send is mandatory for ALL outgoing comms [ctx: ref=CLAUDE.md syncro 'Before any POST: Always show the full payload and wait for confirmation']
 
 2026-06-17 | GURU-5070 | syncro/customer-comment | [correction] conflated Arizona Medical Transit (AMT-PC, Windows: Dell bloatware + misbehaving Syncro agent) cleanup into the Scileppi Mac (#32333) customer comment; Scileppi was a full-disk/Trash + Mail + Downloads-redesign job, no Dell/agent work [ctx: ticket=32333 mac=scileppi]