docs: v6.0.6 release closeout snapshot in status-and-evidence

[sumitake]

Summary

Directive-#5 final release documentation closeout for v6.0.6 (public side; linked workspace companion: sumitake/agent-collab-workspace#2789). Adds the v6.0.6 release closeout snapshot and determinations to docs/architecture/status-and-evidence.md following the established v6.0.1 template: published tag/run/asset evidence with exact SHA-256 values, four-host byte-exact activation, receipted post-install ACP carrier canaries, and per-surface determinations. The v6.0.1 snapshot moves to the historical section. No behavior, package, or release-artifact change.

Compliance trace

author: claude
standing_directives: directive #5 final release documentation closeout; Tier-1 docs fast-path
tier: 1
cross_check: N/A — Tier 1 pure documentation refresh (dated evidence snapshot per the established per-release template); no cross-check round required
post_condition: public architecture handbook records the v6.0.6 released/activated generation; linked workspace companion #2789 records the private side
mcp_coverage_gap: NONE
contributor_rights: OWNER-AUTHORED
operator_reserved: no

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