chore: point branch references at main after multicloud->main merge

[cristim]

Summary

feat/multicloud-web-frontend was merged into main via PR #1131 and the branch is now retired. This PR removes all forward-looking/operational references to it so the repo correctly reflects main as the sole integration base.

Files changed

File	Reference	New value
.github/workflows/deploy-aws-lambda.yml	branches: [main, feat/multicloud-web-frontend] push trigger + comment header	branches: [main] / updated comment
.github/workflows/deploy-azure.yml	branches: [main, feat/multicloud-web-frontend] push trigger + comment header	branches: [main] / updated comment
.github/workflows/deploy-gcp.yml	branches: [main, feat/multicloud-web-frontend] push trigger + comment header	branches: [main] / updated comment
.github/workflows/pre-commit.yml	branches: [main, feat/multicloud-web-frontend] on both pull_request and push triggers	branches: [main] on both
.github/workflows/frontend-build.yml	- feat/multicloud-web-frontend in pull_request.branches list	removed (only main remains)
terraform/environments/azure/ci-cd-permissions/sp.tf	azuread_application_federated_identity_credential.github_feat_multicloud resource binding OIDC subject refs/heads/feat/multicloud-web-frontend	resource removed (branch no longer exists)
README.md	"part of the feat/multicloud-web-frontend branch and is not yet merged to main"	"included in main"

Historical references left in place

These describe past events and were intentionally not changed:

• frontend/src/recommendations.ts:140 — code comment recording that a verification was performed against origin/feat/multicloud-web-frontend
• specs/migration-resilience.md:161 — records the branch a specific commit was introduced on

Test plan

• Confirm grep -rn "feat/multicloud-web-frontend" . --exclude-dir=.git returns only the two historical lines listed above
• All 5 edited workflow YAML files parse without error
• Deploy workflows now trigger only on main pushes
• pre-commit and frontend-build workflows now filter only main
• Terraform plan for terraform/environments/azure/ci-cd-permissions/ shows destruction of azuread_application_federated_identity_credential.github_feat_multicloud[0] only

[cristim]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c9ce7254-ef13-4ed1-878a-75f399a64588

📥 Commits

Reviewing files that changed from the base of the PR and between 3445821 and 4f7d429.

📒 Files selected for processing (7)

• .github/workflows/deploy-aws-lambda.yml
• .github/workflows/deploy-azure.yml
• .github/workflows/deploy-gcp.yml
• .github/workflows/frontend-build.yml
• .github/workflows/pre-commit.yml
• README.md
• terraform/environments/azure/ci-cd-permissions/sp.tf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/retire-multicloud-branch-ref

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