Run cf-integration 0.5.0 conformance on every PR

[lucarlig]

Summary

• pin the conformance workflow and local documentation to cf-integration 0.5.0
• run conformance automatically for every pull request revision
• remove the /conformance issue-comment trigger, manual revision lookup, custom commit statuses, and write permissions
• restore the tools-call-with-progress expected finding removed by Upgrade RMCP to 3.4.0 and remove Origin duplication #153
• keep the completion-complete baseline improvement from RMCP 3.4
• make no production-code changes

Validation

• actionlint .github/workflows/ci.yml .github/workflows/conformance.yml
• git diff --check
• CI: fmt, detect-secrets, clippy, cargo-deny, cargo-shear, test, build, and bench passed
• automatic Conformance workflow triggered for commit 17f74dd; installation currently fails because crates.io has no cf-integration 0.5.0 release

cf-integration 0.5.0 is present on contextforge-dev-tools main but is not yet published to crates.io. This PR depends on 0.5.0 being released before the automatic conformance check can install it.