Merge remote-tracking branch 'origin/main' into aasim/fix/19545

Author: Aasim Khan

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+end_of_line = crlf
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = false
+
+[*.sh]
+end_of_line = lf
+
+[.husky/**]
+end_of_line = lf

mssql/.git-blame-ignore-revs renamed to .git-blame-ignore-revs

@@ -0,0 +1,6 @@
+# Enforce LF line endings for all text files by default
+* text=auto eol=crlf
+# Ensure shell scripts use LF line endings
+.husky/** text eol=lf
+*.sh text eol=lf
+*.init text eol=lf

.gitattributes

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+# GitHub Actions Workflows
+
+## Publish Baseline Artifacts (`publish-baseline.yml`)
+
+### Purpose
+Creates baseline artifacts (VSIX packages size metrics) that PRs can compare against to detect regressions in vsix size.
+
+### How it works
+1. **Triggered automatically** on push to `main` or `release/*` branches
+2. **Can be triggered manually** via workflow_dispatch for testing without pushing code
+3. **Builds both extensions**: `mssql` and `sql-database-projects`
+4. **Packages them into VSIX files** and records their sizes in KB
+5. **Uploads artifact** with 90-day retention:
+   - `baseline-sizes`: JSON file containing size metadata for comparisons (VSIX files themselves are not stored to save space)
+
+## Build and Test (`build-and-test.yml`)
+
+### How it uses baseline artifacts
+
+1. **Downloads baseline sizes** from the target branch (`main` or `release/*`) that the PR is targeting
+2. **Compares VSIX sizes**:
+   - Calculates size difference in KB and percentage change
+   - Fails if VSIX size increases by more than 5%
+   - Uses icons (🟢 decrease, 🔴 increase, ⚪ no change) in PR comments
+3. **Posts comparison results** as a PR comment showing:
+   - Target branch VSIX size
+   - PR branch VSIX size
+   - Difference in KB and percentage
+4. **Coverage comparison** (implicit): Baseline coverage is used by Codecov to show coverage changes
+
+### When baseline comparison runs
+The workflow only performs baseline comparisons when:
+- The PR targets `main` branch, OR
+- The PR targets a `release/*` branch
+
+This is controlled by the `should_compare_baseline` environment variable set early in the workflow.