chore(delivery): align BT6 build and release gates (#160)

Make the contributor, CI, package, and tagged-release contracts agree with the shared BT6 baseline while preserving T3MP3ST's project-specific integrity checks. Exclude workspace-only material from published packages and keep local-agent detection tests host-independent.\n\nCloses #159

.github/pull_request_template.md

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+## Summary
+
+<!-- What changed and why? -->
+
+## Linked issue
+
+Closes #
+
+## Contribution receipt
+
+- Scope class: docs_only | static_fixture | local_lab | ctf_range | authorized_live
+- Target authority:
+- Network use: none | loopback | private_lab | authorized_external
+- Claims or evidence changed:
+- Redaction/provenance notes:
+
+## Verification
+
+- [ ] `npm run typecheck`
+- [ ] `npm test`
+- [ ] `npm run doctor`
+- [ ] Risk-specific checks are listed below, or not applicable with a reason
+
+Exact commands and results:
+
+## Risk and rollback
+
+- Residual risk:
+- Rollback:
+
+## Delivery checks
+
+- [ ] Diff is scoped against current `upstream/main`
+- [ ] No unrelated protected evidence, safety tests, or provider/config files were removed
+- [ ] Published review history was not force-pushed
+- [ ] Exact-head CI must be green before merge