docs(pi): unify split package trees; move live OMP pages to core

Two directories documented one concept (pi npm packages): top-level
packages/ (browser-use, permission-system) and pi/packages/ (peon,
web-access, subagents). Merged into pi/packages/ — one row per package
in a single index, detail pages kept as archive records. The root
index's 'OMP packages and skills' section was doubly wrong (packages/
was pi, not OMP); it becomes a Skills tooling section pointing at the
consolidated /skills/ tree.

Moved the two LIVE omp pages out of the retired-harness banner:
pi/statusline.md -> core/statusline.md, pi/subagent-limits.md ->
core/subagent-limits.md (both document omp behavior against
agent/config.yml + the installed bundle; pi/index.md itself admitted
the mis-shelf). Retargeted every inbound link (core/index, system/
dankserver, log x2, pi/index, settings x2, moved files' own xrefs).

Refs #29

omp-docs/system/dankserver.md

@@ -86,4 +86,4 @@ The old page (verified 2026-08-28) listed an RTX 3090, 60 GiB RAM, and a
 
 - [[dankclaw|dankclaw]] — the other inference box (dragoon + zealot)
 - [[network|network]] — Network topology
-- [/pi/statusline.md](/pi/statusline.md) — where these models surface in the TUI
+- [/core/statusline.md](/core/statusline.md) — where these models surface in the TUI