A0_VERSION

# Agent-Zero version this Exocortex stack is tested against.
# install_all.sh preflight reads the first non-comment line and compares it to
# the target container's `git -C /a0 describe --tags`. Mismatch fails loud
# (override with --force during a deliberate, validated upgrade).
#
# Upstream: https://github.com/agent0ai/agent-zero  (formerly frdel/agent-zero)
# Bump this ONLY after completing the staged upgrade in docs/UPGRADE_A0.md.
#
# version            tested_commit   date_pinned
# v1.18 pinned 2026-05-27 — validated on nifty_panini + promoted to v16/v17.
# v1.20 pinned 2026-06-20 — only solving.md + tips.md conflicted (A0 changed them);
#   both re-based (merged our delta onto v1.20). All other overwrite-patches verified
#   unchanged in v1.20 via check against the 221-file diff. Validated on v16.
# v2.9 pinned 2026-08-19 — Tier 1.1 pipeline migration. The pin was accurate at
#   v1.20: the pipeline genuinely targeted the DEC-030 v1.x layout and the guard
#   was right to fail. Bumped only after all FIVE gate conditions passed on a
#   fresh v2.9 container built BY the pipeline: layout parity 183/183 with the
#   three legacy roots empty, zero STALE core patches, boots + turn completes,
#   11 plugin extensions firing with the retired ones gone, and a post-strip write
#   audit showing zero LEGACY writes.
#   Verify with: scripts/verify_plugin_parity.py + scripts/check_core_patch_staleness.py
#                + scripts/audit_install_writes.sh
v2.9