Integration: 2026.w42

- #680 [E2 AGENT] Update FlexRIC submodule commit ID due to a new v3.0.0 release
- #610 Fix for division by zero in prach sim
- #695 NR RRC: use serving cell band for UE capability enquiry
- #651 nr_phy_common: compute 2-layer ML LLRs for the last REs of a symbol
- #707 O-RU: Fix compilation warnings. enable -WError in CI builds.
- #715 Fixup WLS P7 message transport
- #516 docs(agents): add Comments and Agent commits sections to AGENTS.md
- #697 fix(ue): Move actors to NR UE UE_thread stack.
- #352 Fix handling feature set in UE capabilities
- #652 NR_RRC: detach borrowed RRCReconfiguration params on encode failure
- #723 nrup: fix signed shift overflow in ntoh_int32_buf
- #714 ci: apply a real path loss in the F1 rfsim channel models
- #727 Return 0 from read_version() when sscanf() hits EOF
- #726 task_ans: use acq_rel ordering for the completion counter
- #630 Send full SRB1
- #276 fix(NR_MAC): fix BWP mismatches during F1/N2 handover with dedicated BWP
- #689 fix (nrUE): ignore idle MAC sync ind and unset-carrier sync retune
- #699 Add v3.0.0 release notes

Closes: #226
Closes: #297
Closes: #650
Closes: #710
Closes: #718
Closes: #724
Closes: #96
Closes: #722
Closes: #678