fix(harness): add -hatchmate composites for sonnet, haiku, deepseekv4flash (bug 678d4e8e)

Hatchmate templates resolving to claude-sonnet-5, claude-haiku-4-5 or
airouter-deepseekv4flash mounted only gitea-ssh/v1 and could not clone
hatchmate/hatchmate-agents. Mirror the existing -hatchmate composites:
non-hatchmate base layers plus gitea-ssh-hatchmate/v1 after gitea-ssh/v1 (HC-26).

Claude-Session: https://claude.ai/code/session_01N218bERyNeLhbLmDRDvbWF

harnesses/composites/code-sonnet-tdd-repo-hatchmate/v1/harness.yaml

@@ -0,0 +1,15 @@
+kind: composite
+name: code-sonnet-tdd-repo-hatchmate
+version: 1
+description: "Sonnet code agent (hatchmate fork) — adds gitea-ssh-hatchmate for write access to hatchmate/hatchmate-agents. Use this for hatchmate work; the un-suffixed composite uses the shared ai-enablement key which has no access to the hatchmate org."
+
+layers:
+  - context: code-methodology/v1
+  - context: anthropic-cloud-paul-oauth/v1
+  - context: gitea-ssh/v1
+  - context: gitea-ssh-hatchmate/v1
+  - context: agent-repo/v1
+  - context: tdd-protect/v1
+  - context: tdd-gate/v1
+  - capability: python-dev/v1
+  - capability: tdd-file-lock/v1