Set repository to maintenance mode for llama-stack 0.6.x

[dmaniloff]

Summary

• Cap llama-stack, llama-stack-api, and llama-stack-client dependencies at <0.7.0
• CI matrix: test only against 0.6.0 (removed main)
• Update COMPATIBILITY.md to reflect final release status
• Add maintenance mode notice to README.md

Provider version 0.7.0 targeting llama-stack 0.6.x is the final release. Only critical bug fixes will be accepted.

Test plan

• CI passes with updated matrix

🤖 Generated with Claude Code

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the GitHub Actions CI matrix to run integration tests against llama-stack version 0.6.0 instead of 0.5.0, aligning CI with documented minimum supported version and main branch compatibility.

File-Level Changes

Change	Details	Files
Align CI integration test matrix with documented llama-stack compatibility by bumping the tested release version from 0.5.0 to 0.6.0.	Update the llama-stack-version matrix entry from 0.5.0 to 0.6.0 in the CI workflow configuration Ensure integration tests continue to run against both main (latest) and 0.6.0 (minimum supported) llama-stack versions	.github/workflows/ci.yml

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