feat(feedback): review dashboard, public guide, terminal commands (v4.6.94)

Dashboard (/admin/feedback.html, admin-gated)
- User-feedback tab over the live :8908 API: list, filter, search, publish reply,
  archive/reopen. Reply is what the reporter sees in /stear -> Your reports & replies.
- Agent-items tab: 3 plans parked at autonomy:review + 19 defect reports, one click each.
- Snapshot age line + stale warning (>30 min), and the last apply outcome with failures.
- Existing /admin/ tab relabelled "Client error log" (it renders feedback_log.json, not
  the feedback store) and now links to the review dashboard.

Decision path
- admin/api/feedback-decide.php: exact-match nginx location + auth_request, Origin check,
  item_id allowlist, append-only decisions.jsonl with fwrite+fsync verification.
- scripts/newos4-feedback-apply.py (darkbot): last decision per item wins, superseded rows
  recorded, reject reverts safe->review, per-item try/except, ledger saved per mutation,
  realpath containment, exact standalone-line marker flip, file mode preserved, queue
  rotation at 1 MB. Steering directives now carry the report title.
- scripts/newos4-feedback-collect.py: snapshot for the dashboard, 40-line plan head,
  steering shape assert (-1 = unknown), recent_apply outcomes.
- newos4-feedback-sync.sh: flock -n so overlapping runs cannot double-apply.

Guide + terminal
- feedback-guide.html: which channel (terminal feedback / /stear / automatic reports),
  expectations, exact payload per channel, how to write a report that gets fixed.
  Linked from /stear, index.html footer and help.html.
- newOS4: feedback list|read|reply|archive|reopen|stats|dashboard|help (+ feedback-admin
  alias), admin-token derived per call, argument-validated dispatch so a sentence like
  "feedback list is broken on mobile" is still a message, "feedback -- <text>" forces it.
- help.html: 8 rows, coverage 362/362.

Review: glm-5.3 REWORK -> 15 findings fixed, 5 refuted with evidence, 2 doc-only.
Guide corrected (invented "60 MB per batch" replaced by the real 512 KB/5-per-10-min limits).

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