release(v4.8.7): Issue #17 follow-ups - archive the review reports and bump the lockstep version

Merge-workspace review loop (--all-reviewer): round 1 (@8241bd5) claude
grok PASS, agy NOT PASS (two static wrapper-literal tests did not follow
_decided/_exit_for), codex NOT PASS (R1: a yes/no decision that could not
run read as "no"); fixed in 541c3fe and 65b78b6. Round 2 (@65b78b6) 4/4
PASS. Full suite at 65b78b6 on macOS / Python 3.9 / herdr 0.9.3: 1730
passed / 0 failed / 56 skipped; 18 of the skips were the uninitialized
nats-docker submodule in the fresh worktree, and with it
tests/test_deploy_freshness.py is 31 passed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

.agents/skills/lib.sh

@@ -29,7 +29,7 @@ export WORKSPACE_ROOT
 # Framework semantic version. Single runtime source of truth; kept in lockstep
 # with VERSIONS.md and the 8 SKILL.md frontmatters by tests/test_version_consistency.py.
 # NOTE: unlike other MAM_* variables this one is intentionally NOT env-overridable.
-MAM_VERSION="4.8.6"
+MAM_VERSION="4.8.7"
 export MAM_VERSION
 AGENT_SESSIONS_YAML="${AGENT_SESSIONS_YAML:-$WORKSPACE_ROOT/.mam/agent-sessions.yaml}"