docs: sync README to 3.0.0 facts + note install-log cleanup

[erikdarlingdata]

Summary

README sync for the v3.0.0 release — corrects stale counts an external audit flagged and documents the new 3.0 features. All changes verified against the codebase before editing.

README edits (surgical, no EOL churn)

1. Download table "What it does": 30 → 33 T-SQL collectors
2. Highlights MCP line: 51-63 → 55-66 read-only tools
3. Edition comparison Collectors row: 32 / 24 → 33 / 25
4. Edition comparison MCP row: 63 / 52 → 66 / 55 tools
5. Full Overview tab row: added recommendations alongside critical issues
6. Lite tabs table: added a Recommendations row (Lite has a top-level Recommendations tab in 3.0)
7. Alert Types: added Volume free space (10% or 5 GB free; never fires on Azure SQL DB) and Failed agent job (60-minute lookback; skipped on Azure SQL DB) rows
8. MCP intro: exposes 63 / 52 → 66 / 55 tools
9. MCP tools table: added Object/Index Stats row (get_table_index_sizes, get_index_usage, get_object_locking — registered in both apps); removed the erroneous Lite-only * markers from the Diagnostic Analysis row (those six tools are registered in the Dashboard too)
10. Folder structure: 58 → 59 SQL installation scripts
11. "What You Get": added a bullet for the headline 3.0 Recommendations / Apply Fix (advise-and-act) engine with informed-consent destructive fixes
12. CI badge: repointed from non-existent ci.yml to build.yml so the badge renders

Verification

• install/ confirmed at 59 .sql scripts
• The 3 object-stats MCP tools and all 6 diagnostic-analysis tools confirmed registered in both Dashboard and Lite
• Volume-free-space (LowDiskThresholdPercent=10, LowDiskThresholdGb=5) and failed-job (FailedJobLookbackMinutes=60) defaults confirmed in source
• build.yml exists; ci.yml does not

Install-log cleanup

The PerformanceMonitor_Install_*.txt test-run logs are already untracked and already covered by .gitignore (line 45). Nothing to git rm and no .gitignore change needed — the git-side cleanup was already in place. (75 such files exist in the working tree but are ignored.)

git diff --stat: README.md | 24 +++--- (15 insertions, 9 deletions)

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