chore: update hawk-core-contracts to v0.1.11 and hawk-mcpkit to v0.1.5 (#149)

* chore: update hawk-core-contracts to v0.1.11 and hawk-mcpkit to v0.1.5

- hawk-core-contracts: 60c9bd5 (v0.1.10) → bbb5c76 (v0.1.11) — feat: add graph module (#23)
- hawk-mcpkit: 3e80e92 (v0.1.4) → b0648b5 (v0.1.5) — Merge PR #7
- Updated go.mod and go.sum to reference new tagged versions
- Both new commits are now tagged releases, satisfying submodule-release-parity check

* fix: update go.sum and go.mod for submodule version bumps

- go.mod: add // indirect to hawk-mcpkit require (it's an indirect dependency)
- go.sum: remove old v0.1.10 and pseudo-version entries, keep v0.1.11 and v0.1.5 entries

This fixes the module hygiene CI check which runs 'go work sync' and
verifies go.mod/go.sum/go.work/go.work.sum are not modified.

Author: Patel230