release: integrate Zeus v0.6.0 and Hermes 0.21 workflows

[brainx]

Integrate Zeus 0.6.0 with Hermes Agent 0.21 compatibility, graceful owned-gateway shutdown, authenticated live diagnostics and durable operator messaging. The combined stack includes #42, #43 and #44; package metadata, schema-9 upgrade guidance and release checks are included.

Messaging remains opt-in, with bounded authenticated requests, durable idempotency receipts and explicit recovery when an acknowledged job's outcome is unavailable. Release publication requires successful CI from the exact tagged main commit, plus verified commit and tag signatures. Both release verifiers close HTTP error responses without exposing sensitive response data.

Resolve the ancestry introduced by the #23 squash merge without changing the tested source: current main has the same tree as #23's original head, and the final combined branch has exactly the same file tree as validated candidate 2d70de386548a0bba9c3852b840423173a48d8c1.

Validation:

• The identical candidate tree passed all 18 push/PR CI checks; Python 3.13 ran 1,558 tests twice, with two platform skips and 83.75% coverage.
• Local release preparation passed make release-check; subsequent HTTP cleanup passed 28 focused tests on Python 3.13 and 3.14 with zero ResourceWarnings.
• Candidate archive and distribution checksums passed; all 121 wheel package files and 202 source-archive tracked files matched the tested commit.
• Olymp passed real installed-wheel API checks for Zeus 0.5.0, 0.6.0.dev0 and 0.6.0. Its four CI jobs passed, including the two pinned stable-version wheel checks.
• Merge resolutions preserve the full tested tree; git diff --check passed. Fresh CI on the combined branch is required before main promotion.

Schema 9 is additive. Back up database and profile state before upgrading; rollback requires the pre-upgrade backup and old package. Provider-backed workloads and release-tag publication have not been performed by this validation.