Implement self-contained runtime: install runtime tree, git-root memory, canonical agent paths, + 4 suites

- install.sh: install runtime tree under OPENCODE_DEV_AGENT_TEAM
  (bin/, 12 skills, improvements/, install-manifest.json), idempotent
  shell-rc export, --uninstall (preserves improvements/ user data) and
  --migrate; preserves 13-agent copy, .backup retention, KEEP_BACKUPS=5,
  count gate, cmp -s integrity, install-time permission gate
- memory-lifecycle.sh: resolve MEMORY_DIR from project git root + OPENCODE_MEMORY_DIR
- all 13 agents: canonical runtime sentence + env-resolved runtime paths;
  project-scoped refs unchanged
- tests: new test-install (15), test-runtime (10), test-path-resolution (12),
  test-memory-isolation (12); TEAM_ROOT override on existing 4 suites;
  test-all.sh registers 8 suites (100 checks total)

scripts/test-memory-system.sh

@@ -17,7 +17,7 @@ set -uo pipefail
 #
 # Exit codes: 0 = all pass, 1 = any failure
 
-TEAM_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+TEAM_ROOT="${TEAM_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
 AGENTS="$TEAM_ROOT/agents"
 MEMORY="$TEAM_ROOT/memory"
 SKILLS="$TEAM_ROOT/skills"