chore: archive historical task programs

docs/archived/README.md

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+# Archived task programs
+
+These task programs are historical, completed, superseded, or explicitly not part of the active development queue. They are preserved for provenance and must not be treated as runnable work.
+
+## Archived programs
+
+- `alpha-hardening/` — historical alpha hardening and settlement/authentication task set.
+- `dashboard-test-runner/` — historical dashboard test-runner work.
+- `distributed-inference-performance/` — superseded distributed-inference performance backlog.
+- `node-capability-admission/` — historical capability-admission task set.
+- `proxy-stream-cancellation/` — historical proxy cancellation task.
+- `qwen3.6-27b-demand-placement/` — superseded Qwen demand-placement planning.
+- `routing-compatibility-regression/` — historical routing compatibility regression work.
+
+The active distributed GGUF backlog remains under `.scratch/distributed-gguf-runtime/`. Architectural decisions under `docs/adr/` remain active and were not moved.