release(v4.7.0): bump framework and eight skills to 4.7.0 in lockstep; archive PR #29 reviews

Issue #21 items 4, 5, 7 (worktree helpers, review identity, acceptance
A1-A8), #20 test isolation, #27 .gitignore managed block, #28 host
portability. VERSIONS.md carries the entry; the eight review reports of
PR #29 (two rounds plus the codex re-review) are archived under
.agents/reports/<session>/.

Co-Authored-By: Claude Fable 5.1 <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="4.6.0"
+MAM_VERSION="4.7.0"
 export MAM_VERSION
 AGENT_SESSIONS_YAML="${AGENT_SESSIONS_YAML:-$WORKSPACE_ROOT/.mam/agent-sessions.yaml}"