chore(aiwg): adopt shared BT6 maintainer workflow (#148)

* docs(policy): allow low-impact contributor courtesy cleanup

* chore(aiwg): migrate to shared BT6 maintainer plugin

* chore: reconcile delivery validation

WORKSPACE.md

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+# WORKSPACE.md
+<!-- aiwg-managed -->
+<!-- Generated structure by AIWG; operator content is protected by markers. -->
+
+<!-- AIWG:workspace-context:start -->
+
+## AIWG Context Graph
+
+This file is the canonical provider-neutral home for project and operator context.
+Provider startup files are generated adapters: they direct the harness here first,
+then to AIWG.md for framework discovery and routing.
+
+### Precedence
+
+1. Provider, system, and organization instructions retain their native authority.
+2. Root WORKSPACE.md supplies shared project/operator context.
+3. AIWG.md supplies generated framework/discovery context.
+4. Narrower linked files and provider-native subtree instructions govern their declared scope.
+
+### Ownership
+
+- Edit project-neutral notes only inside the protected Project Context section below.
+- Keep detailed policies, runbooks, hooks, and quickrefs in linked files.
+- Keep provider-only directives in `.aiwg/context/providers/`.
+- Never store secrets, tokens, credentials, or machine-local sensitive values here.
+
+### Linked Context
+
+- [AIWG framework context](./AIWG.md)
+- [AIWG project configuration](.aiwg/aiwg.config)
+- [Project-local quickref](.aiwg/quickref.json) (when configured)
+
+<!-- AIWG:workspace-context:end -->
+
+<!-- AIWG:workspace-operator:start -->
+
+## Project Context
+
+Add project conventions, local hook/context pointers, and links to deeper project documents here.
+
+<!-- AIWG:workspace-operator:end -->