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

.aiwg/plugins/bt6-maintainer/payload/templates/bt6-repository-profile.yaml

@@ -0,0 +1,50 @@
+# Copy to .aiwg/bt6-maintainer.yaml and replace the example values.
+version: "1"
+project:
+  id: "bt6-example"
+  displayName: "BT6 Example"
+  family: "research-tool" # research-tool | support-tool | knowledge-tool | application | library | service | data-pipeline | automation | infrastructure | mixed
+repository:
+  canonicalRemote: "origin"
+  baseBranch: "main"
+  expectedSlug: "bt6/example"
+  ciRemote: "origin"
+tracker:
+  authorityRemote: "origin"
+  provider: "auto" # github | gitea | local | auto
+  expectedActor: "maintainer"
+delivery:
+  requireCiGreen: true
+  requireCurrentHead: true
+  defaultMergeMethod: "squash"
+  allowedMergeMethods: ["squash"]
+validation:
+  quick:
+    - "<targeted check>"
+  full:
+    - "<full test command>"
+  documentation:
+    - "<docs/link/citation check>"
+  researchIntegrity:
+    - "<provenance/corpus/reproducibility check>"
+riskSurfaces:
+  - id: "ingestion"
+    paths: ["<ingestion or parser paths>"]
+    concerns: ["untrusted-source-content", "parser-correctness", "provenance"]
+    requiredChecks: ["<ingestion fixture test>"]
+  - id: "provider-boundary"
+    paths: ["<model/provider/API paths>"]
+    concerns: ["secret-handling", "local-vs-hosted-routing", "quota-and-cost"]
+    requiredChecks: ["<provider contract test>"]
+research:
+  corpusPaths: ["<corpus paths>"]
+  evidencePaths: ["<evidence/provenance paths>"]
+  provenanceRequired: true
+  citationVerificationRequired: true
+security:
+  disclosureUrl: "https://example.invalid/security"
+  sensitiveDataPaths: ["<sensitive-data paths>"]
+  mutationRequiresExplicitApproval: true
+support:
+  requiredEnvironmentFields: ["version", "operating-system", "runtime", "provider", "reproduction"]
+  translationPolicy: "validated-only"